JP2016185128A - Combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combine harvester enabled to install an exhaust gas purification device compactly.SOLUTION: A combine harvester of the present invention comprises: a reaper 3; a thresher 5; an engine 14 for driving the reaper 3 or the thresher 5; an exhaust gas purification device 74 for removing a nitrogen oxide substance from the exhaust gas of the engine 14; an engine room 97 for mounting the engine 14 therein; and a grain tank 7 for carrying-in the grain cropped. The exhaust gas purification device 74 is disposed at the back of the engine room 97, and a urea water supply device 175 for supplying the urea water to the exhaust gas purification device 74 is disposed on the lower side of the exhaust gas purification device 74.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a combine such as a harvester that harvests cereals planted in a field and collects grains, or a combine such as a feed combine that harvests cereals for feed and collects it as feed. The present invention relates to a combine equipped with an exhaust gas purification device that removes particulate matter (soot, particulates) contained in the exhaust gas or nitrogen oxides (NOx) contained in the exhaust gas.

  Conventionally, a diesel particulate filter case (hereinafter referred to as a DPF case) and a urea selective reduction catalyst are provided as exhaust gas purification devices (exhaust gas aftertreatment devices) in the exhaust path of a diesel engine. There is known a technique for purifying exhaust gas discharged from a diesel engine by providing exhausted cases (hereinafter referred to as SCR cases), introducing exhaust gas into the DPF case and the SCR case (for example, Patent Documents 1 to 3). reference). Conventionally, a combine has a structure in which an uncut grain culm in a field is cut by a cutting blade device, the harvested culm is transported to a threshing device by a culm transporting device, threshed, and the grain is collected in a cereal tank. Thus, the engine is mounted on the traveling machine body, and the DPF case is disposed in the lateral orientation on the upper surface side of the engine, and exhaust gas is discharged from the engine toward the DPF case. (For example, refer to Patent Document 4).

JP 2009-74420 A JP 2012-21505 A JP 2012-177233 A JP 2010-209813 A

  In the prior art, in the structure in which the engine and the exhaust gas purification device (DPF case) are installed close to the engine room, it is necessary to secure an installation space for the exhaust gas purification device (SCR case) around the engine mounting portion. There is a problem that the volume of the engine room or the exhaust gas purification device (DPF case or SCR case) is limited. In addition, in the structure in which the exhaust gas purification device (DPF case or SCR case) is supported outside the engine room, the mounting position of the urea mixing pipe or the exhaust gas purification device for connecting the SCR case to the DPF case is limited, and the exhaust gas There is a problem that the purification device mounting structure cannot be simplified. In addition, in a structure in which an exhaust gas purification device (DPF case or SCR case) is installed on a traveling machine body located away from the engine, such as a truck, an installation space for the exhaust gas purification device can be easily secured. There is a problem that the exhaust gas temperature in the purification device tends to drop below a predetermined temperature.

  In addition, when the exhaust gas purification device includes a urea selective reduction catalyst, the exhaust gas purification device is provided with a urea mixing chamber for mixing urea water with the exhaust gas, and urea water is supplied to the urea mixing chamber. It is necessary to let Therefore, when an exhaust gas purification device having a urea selective reduction type catalyst is installed, not only the exhaust gas purification device but also a urea tank for storing urea water to be supplied to the urea mixing chamber, or urea water in the urea water tank is exhausted. A urea water pump to be supplied to the purification device must also be installed. Therefore, it is not sufficient even if the installation space for the exhaust gas purification device is secured, and a place for installing the urea water tank and the urea water pump is also required. In addition, the urea water may freeze in a low temperature environment, and the exhaust gas purification treatment may not function due to the freezing of the urea water, and the purification ability may be reduced due to a change in the urea water concentration.

  Therefore, the present invention seeks to provide a combine that has been improved by examining these current conditions.

  In order to achieve the above object, a combine of the present invention includes a reaping device, a threshing device, an engine that drives the reaping device or the threshing device, and an exhaust gas purification device that removes nitrogen oxides in the exhaust gas of the engine. And an engine room in which the engine is installed and a grain tank for carrying harvested grains, the exhaust gas purification device is installed at the rear of the engine room, and urea is added to the exhaust gas purification device. A urea water supply device for supplying water is provided below the exhaust gas purification device.

  In the combine, the exhaust gas purification device is disposed at a position sandwiched between the engine room and the grain tank, and the urea water supply device is disposed at a position sandwiched between the grain tank and the threshing device. It may be arranged. In addition, a cereal conveyor that conveys the first item sorted by the threshing device to the grain tank, and a reduction conveyor that conveys the second item sorted by the threshing device to the sorting unit of the threshing device. And the urea water supply device may be fixed to a side surface of the threshing device and sandwiched between the whipping conveyor and the reduction conveyor.

  In the above combine, the grain tank is pivotally supported on the rear side so as to be rotatable to the outside of the machine body, and a urea water tank for storing urea water is disposed behind the grain tank, while a fuel tank for storing fuel is provided. It may be arranged behind the threshing device.

  In the above-described combine, a urea water tank for storing urea water may be disposed at the lower part of the machine frame of the threshing apparatus. Moreover, you may arrange | position the urea water tank which stores urea water inside the side cover which covers the side of a threshing apparatus.

  In the combine, a urea water tank for storing urea water is placed on the lower side of the threshing device so as to overlap the fuel tank, and the water supply port of the urea water tank and the fuel supply port of the fuel tank are projected toward the outside of the threshing device. It may be provided.

  In the above combine, the exhaust gas purifying device is constituted by a first case for removing particulate matter in the exhaust gas of the engine and a second case for removing nitrogen oxides in the exhaust gas of the engine, The grain tank may have a recess on a surface facing the engine room, and the first case and the second case may be disposed in the recess of the grain tank.

  In the above combine, the first and second cases may be arranged side by side with the longitudinal direction of each of the first and second cases as the front-rear direction. In the above combine, the exhaust inlet of the second case is connected to the exhaust outlet of the first case via a urea mixing pipe, and the first and second cases are connected between the first and second cases. The urea mixing tubes may be arranged in parallel.

  The combine further includes a fixing member that integrally fixes the first case and the second case coupled in parallel, and the fixing member is supported by a support frame that is erected from the traveling machine body. The exhaust gas purification device may be fixed. In addition, the exhaust gas purification device may be fixed by supporting the fixing member on the support frame, the engine frame, and the threshing device upper surface.

According to the present invention, since the exhaust gas purifying device is disposed at the rear of the engine room, the operator contacts the exhaust gas purifying device that is at a high temperature while the exhaust gas purifying device can be disposed at a position close to the engine. Can be prevented. In addition, exhaust heat from the engine room can be guided to the exhaust gas purification device, so the exhaust gas purification device can be placed in a high-temperature environment necessary for exhaust gas purification, and a high purification effect is maintained in the exhaust gas purification device. According to the present invention, since the urea water supply device is arranged at a position below the exhaust gas purification device, it can be recirculated to the urea water tank via the urea water supply device without circulating the urea water after the engine is stopped. . Therefore, it is possible to prevent the urea water from remaining in the urea water supply path and the exhaust gas purification device after the engine is stopped and to be crystallized, and thus it is possible to suppress the reduction in the purification ability and the device deterioration of the exhaust gas purification device.

  According to this invention, the capacity | capacitance of a grain tank is securable by arrange | positioning an exhaust-gas purification apparatus, a urea water supply apparatus, and a urea water tank effectively using the space around a grain tank. In addition, since the urea water supply device can be disposed near the exhaust gas purification device, the urea water pipe connecting the urea water supply device and the exhaust gas purification device can be configured to be short, and the residual urea water in the pipe can be suppressed. Crystallization of water can be prevented beforehand.

  According to the present invention, in order to arrange the urea water supply device in the region between the threshing device and the cerealing conveyor and the reduction conveyor, the shape of the grain tank is set to ensure the space of the urea water supply device. There is no need to change. Therefore, not only can the capacity of the grain tank be secured, but the shape of the grain tank is not complicated, and its design is facilitated.

  According to the present invention, since the urea water supply device is arranged 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 to be short. Further, by arranging the fuel tank and the urea water tank at the rear of the traveling machine body, the supply ports of the fuel and the urea water can be easily identified. Furthermore, by arranging the urea water tank in the vicinity of the rotation axis of the grain tank, the difference in piping distance based on the opening and closing of the grain tank can be reduced, so the urea water piping hinders the opening and closing operation of the grain tank. There is nothing.

  According to the present invention, by arranging the urea water tank below the exhaust gas purification device and the urea water supply device, the urea water remaining in the urea water pipe or the like can be recirculated 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 set downward, facilitating water supply work.

  According to the present invention, the urea water tank can be installed compactly by utilizing the space around the threshing device, and the urea water piping between the urea water supply device and the urea water tank installed on the side of the threshing device can be configured to be short. . Further, the urea water tank can be formed with a large capacity, and the urea water tank can be replenished with urea water during maintenance work such as around the grain tank or around the engine.

  According to the present invention, the urea water tank can be installed compactly by 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. Furthermore, replenishment workability can be improved by bringing the fuel supply unit and the urea water supply unit close to each other.

It is a left view of the 6-row harvesting combine which shows embodiment of this invention. It is the same top view. It is the same right view. It is a front perspective view which shows the structure in an engine room. It is a perspective view which shows the positional relationship of engine peripheral components, a grain tank, and a threshing machine. It is an external appearance perspective view which shows an engine and an exhaust-gas purification apparatus. It is a back perspective view of an exhaust gas purification device attachment part. It is a right view which shows a part of threshing apparatus. It is urea water supply explanatory drawing. It is a perspective view which shows the components arrangement | positioning on the traveling body in the combine which becomes 1st Embodiment. It is a rear perspective view of the combine. It is a top view of the combine. It is a top view of the combine used as 2nd Embodiment. It is a rear perspective view of the combine. It is a front view of the urea water tank in the combine. It is a right view of the combine. It is a perspective view which shows arrangement | positioning of each component in the combine which becomes 3rd Embodiment. It is a left view which shows the inside of the threshing apparatus of the combine. It is a perspective view which shows the components arrangement | positioning on the traveling body in the combine which becomes 4th Embodiment. It is a rear perspective view of the combine. It is a figure which shows the modification of the urea water tank in the combine. It is a perspective view which shows the components arrangement | positioning on the traveling body in the combine which becomes 5th Embodiment. It is a front view (left side view of a combine) of the fuel tank and urea water tank of the combine. It is a front view (left side view of a combine) which shows the 1st modification of the fuel tank and urea water tank of the combine. It is a side view which shows the structure of the fuel tank shown in FIG. 24, and a urea water tank. FIG. 25 is a side view showing a configuration when the fuel tank and the urea water tank shown in FIG. 24 are separated. It is a front view (left side view of a combine) which shows the 2nd modification of the fuel tank and urea water tank of the combine. It is a side view which shows the structure of the fuel tank shown in FIG. 27, and a urea water tank. It is a front view which shows a state when urea water is filled in the urea water tank shown in FIG.

<First Embodiment>
Below, 1st Embodiment which actualized this invention is described based on FIGS. With reference to FIGS. 1-3, the whole structure of the combine of embodiment mounted with the diesel engine is demonstrated. In the following description, the left side in the forward direction of the traveling machine body 1 is simply referred to as the left side, and the right side in the forward direction is also simply referred to as the right side. As shown in FIGS. 1 to 3, a traveling machine body 1 supported by a pair of left and right traveling crawlers 2 as a traveling unit is provided. At the front part of the traveling machine body 1, a 6-row mowing device 3 that takes in while harvesting cereals is mounted by a single-acting lifting hydraulic cylinder 4 so as to be movable up and down around the mowing pivot fulcrum shaft 4 a. The A threshing device 5 having a feed chain 6 and a grain tank (Glenn tank) 7 for storing grains taken out from the threshing device 5 are mounted on the traveling machine body 1 side by side. 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, a grain discharge conveyor 8 is provided at the rear part of the traveling machine body 1 and can be swung via a vertical take-out conveyor 8 a, and the grains inside the grain tank 7 are transferred from the culling spout 9 of the grain discharge conveyor 8 to a truck bed or It is configured to be discharged into a container or the like. An operation cabin 10 is provided on the right side of the cutting device 3 and on the front side of the grain tank 7. A cabin rotation fulcrum shaft 10a is provided in the lower front portion of the driving cabin 10, and the lower portion of the front surface of the operation cabin 10 is pivotally supported on the traveling machine body 1 via the cabin rotation fulcrum shaft 10a. Thus, the operation cabin 10 is movably installed, and the operation cabin 10 is configured to rotate forward about the cabin rotation fulcrum shaft 10a.

  In the driving cabin 10, the steering handle 11, the driving seat 12, the main transmission lever 15, the auxiliary transmission lever 16, the threshing clutch lever 17 for turning on and off the threshing clutch, and the cutting clutch lever for turning on and off the cutting clutch 18 are arranged. A diesel engine 14 as a power source is disposed in the traveling machine body 1 below the driver seat 12. The operation cabin 10 is provided with a step on which an operator gets on, a handle column provided with a steering handle 11, a lever column provided with the levers 15, 16, 17, 18 and the like.

  As shown in FIG. 1, left and right track frames 21 are arranged on the lower surface side of the traveling machine body 1. The track frame 21 includes a drive sprocket 22 that transmits the power of the engine 14 to the traveling crawler 2, a tension roller 23 that maintains the tension of the traveling crawler 2, and a plurality of track rollers that hold the ground side of the traveling crawler 2 in a grounded state. 24 and an intermediate roller 25 that holds the non-grounded side of the traveling crawler 2 are provided. The driving sprocket 22 supports the front side of the traveling crawler 2, the tension roller 23 supports the rear side of the traveling crawler 2, the track roller 24 supports the grounding side of the traveling crawler 2, and the intermediate roller 25 supports the non-traveling crawler 2. Support the ground side.

  As shown in FIGS. 1 and 2, a fuel tank 31 for storing fuel to be supplied to the engine 14 is disposed at the left rear portion of the traveling machine body 1, and diesel fuel is supplied into the fuel tank 31 from the outside of the threshing device 5 on the left side. It is configured to be replenishable. That is, the fuel tank 31 is installed on the traveling machine body 1 at a position below the sewage cutter 65 at the rear of the threshing device 5, and the fuel filler 32 (see FIG. 8) extends to the left side of the threshing device 5. The oil can be supplied from the outside of the machine.

  As shown in FIG. 1 and FIG. 2, a clipper-type cutting blade device 52 that cuts a stock of uncut grain culm planted on a farm field is provided on a cutting frame 51 connected to a cutting rotation fulcrum shaft 4 a of the cutting device 3. Is provided. In front of the reaping frame 51, a stalk raising apparatus 53 for 6 stalks that raises an uncut cereal cultivated in the field is arranged. Between the culm pulling device 53 and the front end (feed start side) of the feed chain 6, a culm transporting device 54 that transports the chopped culm harvested by the cutting blade device 52 is arranged. In addition, in front of the lower part of the cereal habit raising device 53, a weeding body 55 corresponding to 6 strips for weeding the uncut cereal cedar is provided. While moving in the field, the reaping device 3 is configured to continuously shave the uncut cereal grains planted in the field.

  Next, with reference to FIG.1 and FIG.2, the structure of the threshing apparatus 5 is demonstrated. As shown in FIG. 1 and FIG. 2, the threshing device 5 includes a handling cylinder 56 for threshing threshing, a rocking sorter 57 that sorts the cereals falling below the handling cylinder 56, and a tang fan 58. A processing cylinder 59 for reprocessing the threshing discharge taken out from the rear part of the cylinder 56 and a dust exhaust fan 60 for discharging dust at the rear part of the rocking sorter 57 are provided. In addition, the cereals conveyed by the culm conveying device 54 from the reaping device 3 are inherited by the feed chain 6, carried into the threshing device 5, and threshed by the handling cylinder 56.

  As shown in FIG. 1, on the lower side of the rocking sorter 57, there are a first conveyor 61 for taking out the grain (the first thing) sorted by the rocking sorter 57 and two branches such as a grain with branches and branches. A second conveyor 62 for taking out the articles is provided. The rocking sorter 57 is configured such that the cereal grains leaked from the receiving net 67 stretched below the handling cylinder 56 are rocked and sorted (specific gravity sorting) by the feed pan 68 and the chaff sheave 69. . Grains that fall from the swing sorter 57 are removed by the sorting air from the tang fan 58 and fall to the conveyor 61 first. The grain taken out first from the conveyor 61 is carried into the grain tank 7 via the cereal conveyor 63 and collected in the grain tank 7.

  Further, as shown in FIG. 1, the swing sorter 57 is configured to drop a second thing such as a grain with a branch stem from the chaff sheave 69 onto the second conveyor 62 by the swing sorting. A sorting fan 71 for wind-selecting the second object that falls below the chaff sheave 69 is provided. As for the second thing that has fallen from the chaff sheave 69, the dust and swarf in the grain are removed by the sorting air from the sorting fan 71 and dropped onto the second conveyor 62. The terminal end of the second conveyor 62 is connected to the upper surface side of the feed pan 68 via the reduction conveyor 66, and is configured to return the second product to the upper surface side of the swing sorting plate 67 and re-sort. Yes.

  On the other hand, as shown in FIGS. 1 and 2, an exhaust chain 64 and an exhaust cutter 65 are arranged on the rear end side (feed end side) of the feed chain 6. The waste passed through the feed chain 6 from the rear end side of the feed chain 6 (the straw from which the grain has been threshed) is discharged to the rear of the traveling machine body 1 in a long state, or the rear part of the threshing device 5 After being cut to a suitable length by a waste cutter 65 provided at the top, the waste cutter 65 is discharged to the lower rear of the traveling machine body 1.

  As shown in FIGS. 4 and 5, the grain tank 7 includes a purification device installation recess 7a having a shape with the front left side cut away, a grain discharge conveyor installation recess 7b having a front-rear groove shape on the upper left side, and a left side surface. It is provided with a cereal conveyor installation recess 7c having a shape with a step in the center in the vertical direction. A space behind the engine room 97 is provided in the purification device installation recess 7a on the front surface of the grain tank 7, and an exhaust gas purification device 74 is disposed. In the recess 7b for setting the grain discharge conveyor on the upper surface of the grain tank 7, the grain discharge conveyor 8 having its tip stored in the conveyor support is stored along the recess 7b for setting the grain discharge conveyor. Further, a cereal conveyor 63 is fixed to the groin conveyor installation recess 7c on the left side of the grain tank 7 along the cereal conveyor installation recess 7c. Connected with

  As shown in FIGS. 3, 10, and 11, the grain discharge conveyor 8 is rotatably supported on the upper end side of a vertical take-out conveyor (vertical feed conveyor) 8 a, and the feed end side of the grain discharge conveyor 8 A spear throwing hole 9 is provided in A transverse feed conveyor 8b is disposed at the bottom of the grain tank 7 in the front-rear direction, and the lower end (base end) side of the vertical take-out conveyor 8a is connected to the rear end of the transverse feed conveyor 8b. In addition, a machine outer bottom plate 7a and a machine inner bottom plate (not shown) are provided at the bottom of the grain tank 7, and the machine outer bottom plate 7a and the machine inner bottom plate are inclined toward the transverse feed conveyor 8b, so that the grains inside the grain tank 7 are laterally moved. Flow down in the direction of the feed conveyor 8b. The transverse feed conveyor 8b is extended along the front and rear of the bottom of the grain tank 7, and conveys the grains flowing down along the bottom plate of the grain tank 7 to the rear vertical take-out conveyor 8a.

  The vertical take-out conveyor 8a is connected to the rear end of the transverse feed conveyor 8b protruding from the rear end surface of the grain tank 7, and extends upward along the rear end surface of the grain tank 7 toward the upper side of the grain tank 7. The vertical take-out conveyor 8a is erected on the rear side of the grain tank 7 by connecting the lower end (base end) side to the transverse feed conveyor 8b and fixing the upper part to the rear end face of the grain tank 7. Further, the lower end of the vertical take-out conveyor 8a is supported on the traveling machine 1 so that the grain tank 7 can be moved laterally around the axis of the vertical take-out conveyor 8a toward the outside of the machine, and the right side surface of the threshing device 5 and the rear surface of the engine room 97 Is configured to be openable. A rear cover 30 covering the periphery of the vertical take-out conveyor 8a is detachably provided behind the grain tank 7, and a bottom cover body 165 is detachably provided on the outer surface of the machine-side bottom plate 7a of the grain tank 7.

  Next, referring to FIG. 4 to FIG. 7, a first case 75 (diesel particulate filter, DPF) and second case 229 (selective catalyst reduction, SCR) as the exhaust gas purification device 74, the diesel engine 14, Will be described. A first case 75 as a diesel particulate filter (DPF) that removes particulate matter in the exhaust gas of the diesel engine 14 and urea selective catalytic reduction (SCR) that removes nitrogen oxides in the exhaust gas of the diesel engine 1 A second case 229 as a system is provided. As shown in FIG. 5, an oxidation catalyst 79 and a soot filter 80 are provided in the first case 75. As shown in FIG. 7, an SCR catalyst 232 for urea selective catalyst reduction and an oxidation catalyst 233 are provided in the second case 229.

  The first case 75 has an inlet side case 76 and an outlet side case 77. A diesel oxidation catalyst 79 such as platinum that generates nitrogen dioxide (NO 2) is disposed inside the inlet case 76. Inside the inlet side case 76 and the outlet side case 77, a soot filter 80 having a honeycomb structure for continuously oxidizing and removing the collected particulate matter (PM) at a relatively low temperature is disposed. In addition to the removal of particulate matter (PM) in the exhaust gas of the diesel engine 14 by the diesel oxidation catalyst 79 and the soot filter 80 arranged in series in the movement direction of the exhaust gas in the inlet side case 76 and the outlet side case 77, Reduce carbon monoxide (CO) and hydrocarbons (HC) in exhaust gas. On the other hand, an SCR catalyst 232 and an oxidation catalyst 233 are arranged in series in the movement direction of the exhaust gas in the second case 229. The SCR catalyst 232 and the oxidation catalyst 233 in the second case 229 are configured to reduce nitrogen oxides (NOx).

  Furthermore, as shown in FIGS. 4-7, the 1st case 75 and the 2nd case 229 are comprised in the elongate cylindrical shape extended long in the left-right direction of the body. A DPF inlet pipe 81 for taking in the exhaust gas and a DPF outlet pipe 82 for discharging the exhaust gas are provided on both sides of the first case 75 (one end side and the other end side in the exhaust gas movement direction). Similarly, an SCR inlet pipe 236 for taking in the exhaust gas and an SCR outlet pipe 237 for discharging the exhaust gas are provided on both sides of the second case 29 (one end side and the other end side in the exhaust gas movement direction).

  Further, as shown in FIGS. 4 to 7, a supercharger 118 that forcibly sends air to the diesel engine 14 is disposed at an exhaust gas outlet (exhaust manifold 117) of the diesel engine 14. The DPF inlet pipe 81 is connected to the exhaust gas outlet side of the supercharger 118 via the exhaust connection pipe 119, and the exhaust gas of the diesel engine 14 is introduced into the first case 75. A urea mixing pipe 239 for connecting the SCR inlet pipe 236 to the DPF outlet pipe 82 is connected, and exhaust gas is introduced from the first case 75 into the second case 229 via the urea mixing pipe 239. In addition, the exhaust gas outlet side of the supercharger 118 and the exhaust connection pipe 119 are connected by a bellows-like connection pipe 98 that can be bent and expanded, and the engine 14 vibration on the supercharger 118 side is connected to the exhaust connection pipe 119 side. It is constituted so that it is not transmitted to.

  On the other hand, the DPF outlet pipe 82 and the urea water injection section 240 of the urea mixing pipe 239 are bolted so as to be detachable by a pipe flange. The inlet side case 76 and the outlet side case 77 are detachably connected by bolt fastening of a plurality of thick plate-like intermediate flange bodies 84, and the outlet side case 77 can be separated to perform disassembly maintenance of the soot filter 80. It is composed. Further, a tail pipe 83 is connected to the SCR outlet pipe 237 to open an exhaust gas outlet of the tail pipe 83 toward the upper side of the fuselage, and the exhaust gas of the diesel engine 14 (each cylinder) is supplied to the turbocharger. 118 is introduced into the first case 75, moved from the first case 75 to the urea mixing pipe 239, and urea water in a urea water tank 174, which will be described later, is mixed with the exhaust gas. 229 and introduced into the machine from the tail pipe 83.

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

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

  Further, the right side, the back side, and the top side of the diesel engine 14 and the cooling parts are surrounded by the engine room frame 91, and the cooling fan 115 of the diesel engine 14 cools the engine room 97 from the outside right side of the engine room frame 91. While taking in outdoor air, the warm air after cooling the diesel engine 14 and the cooling parts 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). doing.

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

  Also, rubber pressure contact legs (not shown) provided at the rear rear portion of the operation cabin 10 are brought into contact with the upper surfaces of the left and right cradles 96 of the horizontal frame 94 from above, so The rear part of the driving cabin 10 is supported so as to be able to contact and separate in the vertical direction. The diesel engine 14 is installed in the engine room 97 formed by the bottom surface side of the operating cabin 10 and the engine room frame 91. In addition, as shown in FIG. 4, the conveyor support body 90 is provided in the upper end side of the left support | pillar body 92, and the grain discharge conveyor 8 is supported in a storage position via the conveyor support body 90. As shown in FIG.

  Further, an air cleaner 123 that supplies outside air to the diesel engine 14 and a pre-cleaner 124 that takes in outside air into the air cleaner 123 are provided. An air cleaner 123 is disposed on the right side of the exhaust gas purification device 74 in the upper surface of the engine room 97, and a precleaner 124 is disposed on the right front side of the grain tank 7 and above the engine room 94. The air cleaner 123 is connected via Combustion air is taken into the compressor case 118 a of the supercharger 118 of the diesel engine 14 from the precleaner 124 through the air cleaner 123. The air cleaner 123 is positioned on the front right side of the exhaust gas purification device 74 by being fixed on the right side of the rear surface of the horizontal frame 94 of the engine room frame 91.

  As shown in FIG. 4 to FIG. 6 and the like, the turbocharger 118 is installed on the upper front side of the diesel engine 14 and is provided with a compressor case 118a containing a blower wheel on the right side thereof and a turbine containing a turbine wheel on the left side. A case 118b is provided. The intake intake side provided at the right end of the compressor 118 a communicates with the intake discharge side of the air cleaner 123 via the air supply pipe 120. On the other hand, an exhaust outlet pipe 99 installed at the left end of the turbine case 118b is connected to an exhaust gas inlet (DPF inlet pipe 81) of an exhaust gas purifying device 74 as a post-treatment device via a bendable bellows-like exhaust introduction pipe 98. It connects with the exhaust connection pipe | tube 119 connected to.

  As shown in FIGS. 3 to 6, the exhaust gas purification device 74 including the first case 75 and the second case 229, the air cleaner 123, and the precleaner 124 are distributed left and right with respect to the engine 14 on the back of the engine room frame 91. Are arranged. That is, with respect to the turbocharger 118 on the front surface of the engine 14, an air cleaner 123 and a pre-cleaner 124 serving as an intake system are disposed on the right compressor case 118a side, while an exhaust gas purification serving as an exhaust system is disposed on the left turbine case 119b side. A device 74 is arranged. Therefore, since the intake path and the exhaust path of the engine 14 including the supercharger 118 are divided and arranged on the left and right, the intake path and the exhaust path can be configured with short paths, and the exhaust path through which the high-temperature exhaust gas passes is also provided. The intake path can be spaced apart.

  Next, with reference to FIGS. 4-7, the attachment structure and support structure of the exhaust-gas purification apparatus 74 are demonstrated. The exhaust gas purification device 74 has a unit configuration in which a first case (DPF) 75 and a second case (SCR) 229 are connected in parallel by a case fixing body 231. On the case fixing body 231, the first case 75 is detachably fixed with a plurality of fastening bands 85, and the second case 229 is detachably fixed with a plurality of fastening bands 230. That is, both ends of the plurality of fastening bands 85 and 230 are bolted to the case fixing body 231 so that the first case 75 and the second case 229 are arranged in parallel on the case fixing body 231.

  The exhaust gas purification device 74 is supported on the traveling machine body 1 by fixing the case fixing body 231 having the first case 75 and the second case 229 mounted on the upper surface to the support base 250. As shown in FIGS. 4-7, the support stand 250 is arrange | positioned under the recessed part 7a for purification apparatus installation provided in the front left side (threshing apparatus 5 side) of the grain tank 7, and the exhaust-gas purification apparatus 74 is made into an engine. It supports from the room 97 over the recessed part 7a for purification apparatus installation. As shown in FIGS. 5 to 7, the support base 250 is fixed on the right side of the machine housing frame of the threshing device 5, the front side is fixed on the engine room frame 94, and the right edge is erected from the traveling machine body 1. By being fixed by the support column frame 251, the grain tank 7 is supported at an upper position in the recess 7 a.

  As shown in FIGS. 4 and 6, the front side of the support base 250 is connected to the horizontal frame 94 of the engine room frame 91 by connecting the other end of the bridging frame 252 having one end fixed on the back surface of the support base 250. 91. Further, as shown in FIG. 5, the left edge of the support base 250 is connected to the right side of the upper surface of the threshing device 5 (the threshing upper surface frame on the upper right side of the threshing machine housing) via the assembly adjustment frame 253, thereby 5 is supported on the right side. Further, as shown in FIG. 7, the right edge of the support base 250 is supported on the support frame 251 by being connected to the upper end of the support frame 251 via a horizontal frame 254.

  As shown in FIGS. 4 and 5, the bridging frame 252 extends from the support base 250 toward the horizontal frame 94 at a position between the air cleaner 123 and the purification inlet pipe 81. Thereby, not only can a space for connection between the bellows-like exhaust introduction pipe 98 disposed below the horizontal frame 94 and the purification inlet pipe 91 of the first case 75 be secured, but also buffering with the air cleaner 123 can be prevented. Further, since the bridging frame 252 is disposed at a position between the intake path including the air cleaner 123 and the exhaust path connected to the first case 75, the influence of exhaust heat from the exhaust path on the air cleaner 123 is reduced. it can.

  As shown in FIGS. 4 to 7, the grain tank 7 has a purification device installation recess 7 a on the surface facing the engine room 97, and the first case 75 and the second case are provided in the recess 7 a of the grain tank 7. An exhaust gas purifying device 75 by 229 is arranged. Thus, the exhaust gas purification device 74 can be disposed between the grain tank 7 and the engine room 97 at a position close to the engine 14, but the operator can be prevented from coming into contact with the exhaust gas purification device 74 that reaches a high temperature. . Further, since the exhaust heat from the engine room 97 can be guided to the exhaust gas purification device 74, the exhaust gas purification device 74 is disposed in a high temperature environment necessary for purification of the exhaust gas. The purification effect can be maintained.

  At this time, as shown in FIGS. 4 to 7, the first case 75 and the second case 229 are supported horizontally across the recess 7 a of the grain tank 7 from the threshing device 5. 229 are arranged in parallel. By supporting the first case 75 and the second case 229 horizontally, the exhaust gas purification device 74 can be compactly arranged at a position higher than the engine 14, and high-temperature exhaust gas from the engine 14 is sent to the exhaust gas purification device 74. The structure can be easily guided. Further, by disposing the exhaust gas purification device 74 at a high position, it is possible to prevent water generated due to condensation due to a temperature drop when the engine 14 is stopped from accumulating in the exhaust gas purification device 74.

  As shown in FIGS. 4 to 7, the first case 75 and the second case 229 of the exhaust gas purification device 74 are connected in parallel by a case fixing body 231, and the urea mixing pipe is connected to the exhaust outlet of the first case 75. The exhaust inlet of the second case 229 is connected via the 239, and the urea mixing pipe 239 is disposed between the first and second cases 75, 229 in parallel with the first and second cases 75, 229, respectively. Thus, the first case, the second case, and the urea mixing pipe are configured as an integral unit structure, and the exhaust gas purification device 74 can be installed compactly inside the recess 7a in front of the grain tank 7. Therefore, while the space for installing the exhaust gas purification device 74 can be easily secured, the recessed portion 7a of the grain tank 7 can be made narrow so that the grain storage capacity of the grain tank 7 can be secured.

  The longitudinal direction of each of the first and second cases 75 and 229 of the exhaust gas purification device 74 is the front-rear direction, and the first and second cases 75 and 229 are juxtaposed side by side. It is arranged on the side. The first case 75 is disposed on the threshing device 5 side, while the second case 229 is disposed on the back side of the recess 7 a of the grain tank 7, so that the second case 229 and the urea mixing pipe 239 are covered with the grain tank 7. At the same time, the first case 75 can be disposed at a position close to the exhaust port of the engine 14. Therefore, the exhaust path from the engine 14 to the first case 75 is configured as a short path, and the regeneration process in the first case 75 can be maintained with high performance. Further, the second case 229 and the urea mixing pipe 239 can be arranged in a high temperature environment surrounded by the grain tank 7 behind the engine room 97, and at the same time, the urea water is prevented from freezing and at the same time the purification capacity in the second case 229 is enhanced. Can be maintained.

  As shown in FIGS. 7 to 12, a urea water tank 174 that stores urea water (urea aqueous solution for selective catalyst reduction) and a urea water supply device 175 that supplies urea water to the urea water injection unit 240 of the urea mixing pipe 239 are provided. I have. The urea water supply device 175 supplies the urea water in the urea water tank 174 to the urea water injection unit 240 of the urea mixing pipe 239, whereby the urea water is supplied from the urea water injection valve 178 of the urea water injection unit 240. Spray inside.

  As shown in FIG. 9, the urea water supply device 175 includes a urea water pump 171 that pumps the urea aqueous solution in the urea water tank 174 and a urea water supply electric motor 172 that drives the urea water pump 171. The urea water supply device 175 is connected to the urea water injection valve 178 of the urea injection unit 240 via the urea water injection pipe 177, and the urea water supply pipe 179 and the urea water return pipe 180 are connected to the urea water tank 174. Connected. Further, 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 are provided.

  Then, a urea water injection valve 178 is attached to the urea injection portion 240 of the urea mixing pipe 239, and a urea aqueous solution is sprayed from the urea water injection valve 178 into the urea mixing pipe 239. The urea water supplied into the urea mixing pipe 239 is configured to be mixed as ammonia in the exhaust gas from the first case 75 to the second case 229. The urea water temperature sensor 183 of the urea water tank 174 and the urea water amount sensor 184 of the urea water tank 174 are connected to the urea injection controller 182, and the engine controller 181 and the urea injection controller 182 are connected to the diesel engine 14. The urea water is supplied into the urea mixing pipe 239 at an appropriate time according to the operating condition.

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

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

  Further, as shown in FIGS. 10 and 12, the exhaust gas purification device 74 is disposed at a position sandwiched between the engine room 97 and the grain tank 7 and is sandwiched between the grain tank 7 and the threshing apparatus 5. The urea water supply device 175 is arranged in the front. By effectively using the space around the grain tank 7 and arranging the exhaust gas purification device 74 and the urea water supply device 175, the capacity of the grain tank 7 can be secured. Further, since the exhaust gas purification device 74 and the urea water supply device 175 can be arranged at a short distance, the urea water pipe (urea water injection tube 177) connecting the exhaust gas purification device 74 and the urea water supply device 175 is shortened. Can be configured.

  As shown in FIGS. 7 and 8, the urea water supply device 175 is fixed to the side surface of the threshing device 5 on the right side (the grain tank 7 side) sandwiched between the cereal conveyor 63 and the reduction conveyor 66. . Thereby, since the urea water supply device 175 can be disposed in the vicinity of the exhaust gas purification device 74 located on the front surface of the grain tank 7 adjacent to the threshing device 5, the urea water pipe connecting the urea water tank 174 to the urea water injection unit 240. The (urea water injection pipe 177) can be configured to be short. Further, the exhaust gas purification device 74 and the urea water supply device 175 can be arranged in the exhaust heat air flow path formed between the threshing device 5 and the grain tank 7 behind the engine room 97. Therefore, the SCR system can be operated under an optimum temperature environment, such as prevention of freezing of urea water.

  In the present embodiment, as shown in FIGS. 7 and 8, the urea water supply device 175 is fixed at a position on the front side of the cereal conveyor 63 and below the reduction conveyor 66. That is, the urea water supply device 175 is fixed to the right side surface of the threshing device 5, and is disposed below the reduction conveyor 66 and at a position between the red pepper fan 58 and the first conveyor 61. That is, the urea water supply device 175 is disposed at a position surrounded by the cereal conveyor 63 and the reduction conveyor 66 that intersect each other, and the cover body 58 a that covers the right suction port of the red pepper fan 58.

  On the other hand, the grain tank 7 is installed without a cereal conveyor 63 and a reduction conveyor 66 without buffering. Therefore, the urea water supply device 175 can be fixed to the side of the threshing device 5 without buffering with the grain tank 7 by arranging the urea water supply device 175 in the area surrounded by the cereal conveyor 63 and the reduction conveyor 66. Therefore, the capacity of the grain tank 7 can be secured.

  Next, with reference to FIG. 8, a modified example of the installation position of the urea water supply device 175 disposed in the region sandwiched between the whipping conveyor 63 and the reduction conveyor 66 will be described. As shown in FIG. 8, the urea water supply device 175 may be installed at a position on the front side of the cereal conveyor 63 and below the reduction conveyor 66, and as indicated by a virtual line, By disposing at the same height position, it is disposed at a height position below the exhaust gas purification device 74.

  Further, as shown by the phantom line in FIG. 8, the urea water supply device 175 may be installed on the rear side of the cereal conveyor 63 and above or below the reduction conveyor 66. Furthermore, in the case where the threshing conveyor 63 and the reduction conveyor 66 are arranged side by side on the right side surface of the threshing apparatus 5, a urea water supply device 175 is provided between the threshing conveyor 63 and the reduction conveyor 66. It may be installed.

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

  As shown in FIGS. 10 to 12, the urea water tank 174 is vertically arranged with its longitudinal direction as the vertical direction, and is fixed to the lower side of the right edge (machine outer edge) of the rear end surface of the grain tank 7. The Then, in order to project the water supply port 174a toward the right side opposite to the fuel supply port 32 directed to the left side of the traveling machine body 1, when performing the fuel supply operation to the fuel tank 31 or the water supply operation to the urea water tank 174, In addition, misjudgment between the oil supply port 32 and the water supply port 174a can be prevented. Further, since the water supply port 174a protrudes obliquely rearward, the amount of wraparound of the water supply hose from the oil supply port 32 to the water supply port 174a can be reduced, and the oil supply operation and the water supply operation can be performed simultaneously.

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

  As shown in FIGS. 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 on the grain tank 7. Arranged at the rear. That is, since the urea water supply device 175 is disposed between the exhaust gas purification device 74 and the urea water tank 174, the urea water pipes 177, 179, 180 from the urea water tank 174 to the exhaust gas purification device 74 can be configured to be short. .

  As shown in FIG. 12, the grain tank 7 is configured such that the rear part of the grain tank 7 is supported on the vertical take-out conveyor 8a and is laterally movable around the axis line of the vertical take-out conveyor 8a. By rotating the grain tank 7 outwardly about the vertical rotation axis of the vertical take-out conveyor 8a, the right side surface of the threshing device 5 and the rear surface of the engine room 97 can be opened. Since the urea water tank 174 is installed in the vicinity of the vertical take-out conveyor 8 a, the connecting portion between the urea water supply pipe 179 and the urea water return pipe 180 can be arranged near the rotation fulcrum of the grain tank 7. The urea water supply pipe 179 and the urea water return pipe 180 are routed from the left side surface of the grain tank 7 by bypassing the back surface. Therefore, the pipe distance from the urea water tank 174 to the urea water supply device 175 is shortened when the grain tank 7 is opened compared to when the grain tank 7 is stored, and the difference in the pipe distance can be reduced by opening and closing the grain tank 7.

  Further, when the grain tank 7 is opened by lateral movement, the exhaust gas purification device 74 and the urea water supply device 175 behind the engine room 97 can be easily accessed. On the other hand, when the grain tank 7 is stored, the exhaust gas The purification device 74 and the urea water supply device 175 are inaccessible. Therefore, when the grain tank 7 is housed, it becomes impossible to contact the exhaust gas purification device 74 and the like that become hot during operation, so that the safety of the worker can be ensured and the grain tank 7 can be used in various operations such as maintenance. And the exhaust gas purification device 74 and the urea water supply device 175 can be easily accessed.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. Note that the combine in this embodiment differs from the first embodiment in that a urea water tank 174 behind the grain tank 7 is placed horizontally on the lower side of the grain tank 7. The other configuration is the same as that of the combine in the first embodiment, and therefore detailed description thereof is omitted, and the configuration related to the urea water tank 174 will be described below.

  In the combine in this embodiment, as shown in FIG. 13, the exhaust gas purification device 74 is disposed in the front periphery 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. It is arranged behind the grain tank 7. In addition, the fuel tank 31 and the urea water tank 174 are arranged to the left and right behind the traveling machine body 2 so that the supply ports 32 and 174a for the fuel and the urea water can be easily identified.

  As shown in FIGS. 13 to 15, the urea water tank 174 is fixed horizontally on the bottom plate of the grain tank 7, and the rear end portion projects rearward from the grain tank 7. That is, the rear end portion of the urea water tank 7 is disposed in the vicinity of the connecting portion between the vertical take-out conveyor 8a and the transverse feed conveyor 87b. The rear end portion of the urea water tank 174 is arranged on the left side of the grain tank 7 via the urea water supply pipe 179 and the urea water return pipe 180 that are piped between the threshing device 5 and the grain tank 7. And connected to the urea water supply device 175.

  As shown in FIGS. 14 and 15, a tank support 173 is provided on the outer surface of the machine outer bottom plate 7 a of the grain tank 7, and a urea water tank 174 is provided on the outer surface of the machine outer bottom plate 7 a of the grain tank 7 via the tank support 173. Support. A bottom cover body 165 is detachably provided on the outer surface of the machine-side bottom plate 7 a of the grain tank 7, and a urea water tank 174 is disposed on the machine inner side of the bottom cover body 165. On the right side surface of the urea water tank 174, the water supply port 174a is arranged facing the right side (the outside of the machine). At this time, the rear cover 30 is provided with an opening, and the water supply port 174a of the urea water tank 174 protrudes outward from the machine, thereby facilitating water supply work from outside the machine.

  As shown in FIG. 15, 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 rotation fulcrum of the grain tank 7. The rear end portion of the urea water tank 174 is arranged on the left side of the grain tank 7 via the urea water supply pipe 179 and the urea water return pipe 180 that are piped between the threshing device 5 and the grain tank 7. And connected to the urea water supply device 175. Therefore, the pipe distance from the urea water tank 174 to the urea water supply device 175 is shortened when the grain tank 7 is opened compared to when the grain tank 7 is stored, and the difference in the pipe 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 at a height position below the exhaust gas purification device 74. Further, the urea water supply device 175 is disposed at a position higher than the urea water tank 174 and is offset in the front-rear direction (or the left-right direction). That is, the urea water supply device 175 is fixed at a position higher than the urea water tank 174 and lower than the urea water injection valve 178.

  By disposing the urea water injection valve 178 at a higher position than the urea water supply device 175, after the urea water injection stops, the remaining urea water is removed due to the height difference between the urea water supply device 175 and the urea water injection valve 178. Then, it can be refluxed to the urea water supply device 175. Similarly, by disposing the urea water supply device 175 at a position higher than the urea water pump 174, the urea water remaining due to the difference in height between the urea water tank 174 and the urea water supply device 175 after the urea water injection is stopped. Can be recirculated to the urea water tank 174. Therefore, as shown in FIG. 16, the urea water supply device 175 is arranged at a height position between the exhaust gas purification device 74 and the urea water tank 174, and is circulated by the urea water supply device 175 after the engine is stopped. The urea water can be recirculated to the urea water tank 174 without causing the urea water return pipe 180 to be omitted.

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS. Note that the combine in this embodiment differs from the first and second embodiments in that a urea water tank 174 is disposed in the lower space of the threshing device 5. The other configuration is the same as that of the combine in the first and second embodiments, and thus detailed description thereof is omitted, and the configuration related to the urea water tank 174 will be described below.

  As shown in FIGS. 17 and 18, a urea water tank 174 is disposed below the machine frame 36 constituting the frame of the threshing device 5. The urea water tank 174 can be installed in a compact manner by utilizing the space below the threshing machine frame 36, and the urea water tank 174 is formed in a large capacity so that maintenance work such as around the grain tank 7 or around the engine 14 can be performed. The urea water tank 174 can be configured to be replenished with urea water.

  As shown in FIGS. 17 and 18, the urea water supply device 175 is arranged on the right side surface (the grain tank 7 side) of the threshing device 5, and a piping path connecting the urea water tank 174 and the urea water supply device 175 ( The urea water supply pipe 179 and the urea water return pipe 180) can be configured to be short. Accordingly, the piping path from the exhaust gas purifying device 74 to the urea water tank 174 can be shortened, the urea water can be smoothly pumped through the pipes 177, 179, 180, and urea water based on recrystallization or freezing can be used. Quality degradation can be suppressed. 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 are utilized by utilizing the space around the threshing device 5. The tank 174 can be arranged in a compact manner, and the maintainability 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 urea water injection is stopped, the remaining urea water can be returned to the urea water tank 174 due to the height difference between the urea water tank 174 and the urea water supply device 175. Therefore, after the engine is stopped, the urea water can be recirculated to the urea water tank 174 without being circulated by the urea water supply device 175, and the urea water return pipe 180 can be omitted.

  As shown in FIGS. 17 and 18, in this embodiment, a urea water tank 174 is arranged on the lower surface side of the tang 37 in the lower part of the threshing machine frame 36. That is, by installing the urea water tank 174 at a position between the Kara fan 58 and the first conveyor 61, the urea water tank 174 is placed at a position offset below the urea water supply device 175 in the left-right direction. Can be placed.

  As shown in FIGS. 17 and 18, the urea water supply pipe 179 and the urea water return pipe 180 connected to the urea water tank 174 are arranged along the right side surface of the threshing device 5 vertically and along the lower side of the threshing machine frame 36 sideways. In this way, piping can be made short. In addition, the urea water tank 174 can be disposed in the vicinity of the tang fan 56 that induces exhaust heat from the engine 14, and by using the exhaust heat from the engine 14, freezing and recrystallization of the urea water can be prevented.

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

<Fourth Embodiment>
Next, a fourth embodiment embodying the present invention will be described with reference to FIGS. In addition, the combine in this embodiment has arrange | positioned the urea water tank 174 in the side space of the threshing apparatus 5 unlike 3rd Embodiment. The other configuration is the same as that of the combine in the third embodiment, and therefore detailed description thereof is omitted, and the configuration related to the urea water tank 174 will be described below.

  As shown in FIGS. 19 and 20, a urea water tank 174 that stores urea water is disposed inside the side cover 41 that covers the left side of the threshing device 5. The urea water tank 174 can be installed compactly by utilizing the space inside the side cover 51, and a piping path (urea) connecting the urea water supply device 175 disposed on the right side of the threshing device 5 (the grain tank 7 side) The water supply pipe 179 and the urea water return pipe 180) can be configured to be short.

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

  The urea water tank 174 is provided in the front-rear direction on the left side of the fuel tank 31 and has a shape in which a rear portion thereof protrudes upward. The urea water tank 174 is provided with a water supply port 174a projecting toward the outer side (left side) of the rearward upward projecting portion. By configuring the urea water tank 174 in this way, the urea water tank 174 can be installed in a compact manner 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 arranged close to each other, and the replenishment workability can be improved.

  In the present embodiment, the urea water tank 174 may be configured integrally with the side cover as in the modification shown in FIG. In the modification shown in FIG. 21, the urea water tank 174 is provided with a tank portion 174c for storing urea water on the back side (fuel tank 31 side) of the side cover portion 174b that covers the entire left side surface of the fuel tank 31, while the side cover A water supply port 174a communicating with the tank portion 174c is provided on the front side of the portion 174b. Further, an opening 174d is provided in the non-installation area of the tank portion 174c of the side cover portion 174b, and the fuel filler port 32 of the fuel tank 31 is inserted through the opening 174d.

  At this time, the connecting portion between the tank portion 174c, the urea water supply pipe 179, and the urea water return pipe 180 is configured to be detachable with a quick coupler or the like, so that the side cover integrated urea water tank 174 can be removed. . Thus, by removing the urea water tank 174, work such as maintenance and cleaning around the fuel tank 31 is facilitated, and by removing the urea water tank 174 and storing it, the urea water can be stored in an optimum temperature environment. Can manage.

<Fifth Embodiment>
Next, a fifth embodiment of the present invention will be described with reference to FIGS. Note that the combine in this embodiment differs from the third embodiment in that a urea water tank 174 behind the grain tank 7 is placed on the fuel tank 31 in an overlapping manner. The other configuration is the same as that of the combine in the third embodiment, and therefore detailed description thereof is omitted, and the configuration related to the urea water tank 174 will be described below.

  As shown in FIGS. 22 and 23, the urea water tank 174 is overlapped with the fuel tank 31 and arranged below the threshing device 5, and the water supply port 174 a of the urea water tank 174 and the oil supply port 32 of the fuel tank 31 are connected to the threshing device 5. Projecting toward the outside of the machine. Thereby, since each supply port (fuel supply port 32 and water supply port 174a) of the fuel tank 31 and the urea water tank 174 can be arrange | positioned in the mutually close position, the burden concerning a fuel supply and water supply operation | work can be reduced.

  As shown in FIGS. 22 and 23, urea water is stored behind the threshing device 5 and in the lower rear portion of the machine frame 36 (second basket 39) and the swing sorter 57 constituting the frame of the threshing device 5. A urea water tank 174 that overlaps with the fuel tank 31 is disposed. In addition, a urea water tank 174 and a fuel tank 31 are arranged vertically on the inside of the side cover 41 that covers the left side of the threshing device 5, and the oil supply port 32 and the water supply port 174 a are connected to the outside of the machine from the opening of the side cover 41. Protruding. Thereby, the urea water tank 174 can be installed in a compact manner by utilizing the space behind the threshing device 5, and the piping path that connects the urea water supply device 175 disposed on the right side surface (the grain tank 7 side) of the threshing device 5. (Urea water supply pipe 179 and urea water return pipe 180) can be configured to be short.

  As shown in FIGS. 22 and 23, the upper part of the fuel tank 31 has a tapered shape (a shape in which the front-rear width becomes narrower upward), and the urea water tank 174 has a substantially inverted U shape. The urea water tank 174 is installed on the fuel tank 31 such that the urea water tank 174 is shaped to match 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. The urea water tank 174 is mounted on the fuel tank 31 so as to sandwich the fuel tank 31 forward and backward, and the urea water tank 174 is fixed on the fuel tank 31.

  The urea water tank 174 is configured to be detachable from the fuel tank 31. At this time, the urea water tank 174 may be configured to be detachable by sliding 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 configured in the up-down direction with respect to the fuel tank 31. It may be fitted and detached. At this time, the connecting portion between the urea water tank 174, the urea water supply pipe 179, and the urea water return pipe 180 is configured to be detachable with a quick coupler or the like. In this way, by configuring the urea water tank 174 to be separable from the fuel tank 31, not only can the water be easily supplied by replacing the urea water tank 174, but the urea water tank 174 can be removed and stored after the work is completed. Prevents quality degradation.

  Next, a first modification example of the present embodiment will be described below with reference to FIGS. In this modification, as shown in FIGS. 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, the fuel tank 31 functions as a heat insulation layer, and the heat retention effect in the urea water tank 174 can be improved, and the urea water stored in the urea water tank 174 is deteriorated. Can be suppressed.

  In the first modified example, as shown in FIGS. 25 and 26, a notch 31a is provided on the lower side of the left side of the fuel tank 31 (side surface provided with the fuel filler port 32), and a urea water tank 174 is fitted into the notch 31a. Match. The urea water tank 174 has a shape conforming to the cutout portion 31a of the fuel tank 31, and is disposed on the lower left side of the fuel tank 31. The cutout portion 31a of the fuel tank 31 causes the upper surface of the urea water tank 174 and The right side is covered.

  Further, as shown in FIG. 25, the fuel tank 31 is fixed to the traveling machine body 1 by a tank support (support belt) 33. At this time, the fuel tank 31 is fixed by the tank support 33 at a position overlapping the storage position (formation position of the notch 31a) of the urea water tank 174, so that the urea water tank 174 is also driven by the tank support 33. 1 can be supported and fixed. Further, since the tank support 33 is installed so that the tank support 33 is hung on the left end portion of the urea water tank 174, the urea water tank 174 is removed from the fuel tank 31 without removing the tank support 33. Can be separated.

  Next, a second modification example of the present embodiment will be described below with reference to FIGS. In this modification, as shown in FIGS. 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. Let 174 be a shape having a convex portion 174x that protrudes above the water supply port 174a. By providing the convex portion 174x extending to the upper side from the water supply port 174, a space where the urea water is not filled can be secured in a part of the convex portion 174x. Therefore, even when the urea water in the urea water tank 174 is frozen, the volume of the urea water in the urea water tank 174 is prevented from exceeding the volume of the urea water tank 174, and the urea water tank 174 is prevented from being damaged. it can.

  In the second modified example, as shown in FIGS. 27 to 29, the left end portion of the urea water tank 174 has a shape protruding from the left end portion of the fuel tank 31 to the outer side (left side). That is, when the urea water tank 174 is fitted into the notch 31 a of the fuel tank 31, the left side surface of the urea water tank 174 is located on the left side of the left side surface of the fuel tank 31. Then, at the left end portion of the urea water tank 174, a convex portion 174x that protrudes above the water supply port 174a is provided at a position offset with respect to the fuel supply port 32 of the fuel tank 31, and the upper surface of the convex portion 174x is provided. Is provided with a breather 174y so that outside air can be taken in.

  As shown in FIG. 28 and FIG. 29, even if urea water is supplied to the urea water tank 174 by adopting a configuration having the breather 174y at a position higher than the water supply port 174a, the convex portion 174x is not filled with water. The upper part of the convex part 174x is always filled with air through the breather 174y. Therefore, even if the urea water in the urea water tank 31 is frozen, the volume increase of the frozen urea water can be accommodated in the space above the convex portion 174x, and the volume of the urea water tank 31 may be exceeded. Therefore, the urea water tank 31 can be prevented from being damaged.

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

Claims (7)

Harvesting device, threshing device, engine driving the harvesting device or threshing device, exhaust gas purifying device for removing nitrogen oxides in the exhaust gas of the engine, engine room in which the engine is installed, and harvesting Combine with a grain tank to carry the harvested grain,
The exhaust gas purification device is installed 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. .   The exhaust gas purification device is disposed at a position sandwiched between the engine room and the grain tank, and the urea water supply device is disposed at a position sandwiched between the grain tank and the threshing device. The combine according to claim 1, characterized in that: A cereal conveyor that conveys the first item sorted by the threshing device to the grain tank, and a reduction conveyor that conveys the second item sorted by the threshing device to the sorting unit of the threshing device. Has
The combine according to claim 2, wherein the urea water supply device is fixed to a side surface of the threshing device and sandwiched between the whipping conveyor and the reduction conveyor. The grain tank is pivotally supported at the rear so that it can be rotated to the outside of the machine body,
The urea water tank for storing urea water is disposed behind the grain tank, while the fuel tank for storing fuel is disposed behind the threshing apparatus. Combine as described in.   The combine according to any one of claims 1 to 3, wherein a urea water tank for storing urea water is disposed at a lower part of the machine frame of the threshing device.   The combine according to any one of claims 1 to 3, wherein a urea water tank that stores urea water is disposed inside a side cover that covers a side of the threshing device.   A urea water tank for storing urea water is placed on the lower side of the threshing device so as to overlap with a fuel tank, and a water supply port of the urea water tank and a fuel supply port of the fuel tank are protruded toward the outside of the threshing device. The combine according to any one of claims 1 to 3.

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