JP2010083331A - Combined harvester and thresher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined harvester and thresher including an exhaust emission control device effectively making the most of a space formed in the combine, and efficiently purifying exhaust gas. <P>SOLUTION: This combine harvester and thresher includes: a traveling machine body 1 with a diesel engine 20 mounter thereon; and a step 11 in which an operator boards. The diesel engine 20 is arranged in the vicinity of the step 11. The exhaust emission control device 90 for purifying exhaust gas discharged by the diesel engine 20 is arranged on a lower surface side of the step 11. The emission control device 90 includes: a DPF (diesel particulate filter) part 65 for collecting particulate substance in the exhaust gas of the diesel engine 20; and an NOx catalyst part 68 for reducing nitrogen oxide in the exhaust gas. In the diesel engine 20, an exhaust manifold is arranged. The DPF part 65 and the NOx catalyst part 68 are adjacently arranged on the same side as the exhaust manifold of the diesel engine 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exhaust gas purification apparatus for a combine equipped with a diesel engine.

2. Description of the Related Art Conventionally, in a work vehicle such as a tractor equipped with a diesel engine, a configuration including an exhaust gas purification device such as a diesel particulate filter (DPF) or a NOx catalyst is known for purifying exhaust gas generated by the diesel engine. . Patent Document 1 discloses a work vehicle provided with this type of exhaust gas purification device.
JP 2008-31955 A

  Compared to a tractor or the like, a combine in a work vehicle is configured to include various devices such as a reaping device, a threshing device, and a glen tank, and therefore places where the exhaust gas purification device is disposed are limited. As a method of arranging the exhaust gas purification device so as not to interfere with each device of the combine, the exhaust pipe of the diesel engine is extended and the exhaust gas purification device is arranged on the upper side of the threshing device or the lower side of the traveling machine body. Configuration etc. can be considered.

  By the way, when exhaust gas is purified by a diesel particulate filter (DPF) or NOx catalyst that needs to keep the temperature of the catalyst at a constant high temperature, it is necessary to maintain the temperature of each part of the purification device at a high temperature. is there. However, it is difficult to maintain the temperature of the exhaust gas purification device in a high temperature state in the configuration in which the exhaust gas purification device is disposed on the upper side of the threshing device as described above or on the lower side of the traveling machine body. In particular, when a combine is operated in a place with a severe temperature environment such as a cold region, it has been difficult to effectively perform the purification processing function by maintaining the temperature of a catalyst such as a DPF or NOx catalyst in an appropriate state.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an exhaust gas purification device that can effectively use the space formed in the combine and can efficiently purify the exhaust gas. Is to provide a combine.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to the viewpoint of this invention, the combine comprised as follows is provided. That is, the combine includes a traveling machine body on which a diesel engine is mounted, a reaping device, a threshing device, and a step on which an operator gets on. The diesel engine is disposed in the vicinity of the step, and an exhaust gas purification device for purifying exhaust gas discharged by the diesel engine is disposed on the lower surface side of the step.

  Thereby, the exhaust gas purification device can be arranged by effectively utilizing the space on the lower surface side of the step. For example, in an airframe structure in which a diesel engine is installed below a seat on which an operator sits, the exhaust gas purification device can be assembled in a state in which the diesel engine is approached using a frame forming a step. As a result, the configuration for purifying the exhaust gas can be made compact. Further, even when exhaust gas is purified using a catalyst that requires a high temperature state, a diesel engine is disposed in the vicinity of the exhaust gas purification device. The catalyst of the gas purification device can be efficiently maintained at a high temperature. Therefore, the purification function of the exhaust gas purification device is improved, and the exhaust gas purification device can function effectively even when the combine is operated in a severe temperature environment such as a cold region.

  The combine is preferably configured as follows. That is, the exhaust gas purification device includes a diesel particulate filter that collects particulate matter in the exhaust gas of the diesel engine, and a NOx catalyst that reduces nitrogen oxides in the exhaust gas of the diesel engine. . At least one of the diesel particulate filter or the NOx catalyst is arranged adjacent to the side where the exhaust manifold of the diesel engine is arranged.

  Thereby, since the diesel particulate filter or the NOx catalyst is arranged on the side where the exhaust manifold is arranged, the exhaust structure using the diesel particulate filter and the NOx catalyst can be configured compactly. Further, since the diesel particulate filter or the NOx catalyst is disposed adjacent to the diesel engine, the temperature of the catalyst can be efficiently maintained.

  In the combine, it is preferable that at least a part of a urea supply device for supplying urea to the NOx catalyst is disposed on the lower surface of the step.

  Thereby, the urea supply device for supplying urea to the NOx catalyst can be arranged by effectively utilizing the space on the lower surface side of the step. Therefore, the configuration for purifying the exhaust gas can be further compacted.

  The combine is preferably configured as follows. That is, the step is arranged adjacent to an engine room in which the diesel engine is installed. The footrest surface of the step is formed at a higher position than the lower surface of the engine room.

  Thus, the exhaust gas purification device can be assembled to the lower surface side of the step by effectively utilizing the vertical space between the lower surface of the engine room and the footrest surface of the step. For example, the exhaust gas purification apparatus can be supported in a state where a certain distance from the ground surface is secured by using the frame forming the step. Thereby, it is possible to effectively prevent the exhaust gas purification device from being damaged by colliding with an obstacle on the ground (such as a farm shore or a side ditch).

  Preferred embodiments of the present invention will be described below with reference to the drawings. In the following description, “left side”, “right side”, and the like simply mean the left side and the right side in the direction in which the combine moves forward. FIG. 1 is a side view showing the entire combine from the left side of the combine according to the embodiment of the present invention. FIG. 2 is a side view showing the entire combine from the right side of the combine. FIG. 3 is a plan view of the combine.

  As shown in FIGS. 1, 2, and 3, the combine according to the present embodiment includes a traveling machine body 1 supported by a pair of left and right traveling crawlers 2 (traveling portions). At the front part of the traveling machine body 1, there is arranged a cutting device 3 for four-line cutting that harvests cereal grains. This reaping device 3 is mounted on the traveling machine body 1 so as to be adjustable up and down around the harvesting rotation fulcrum shaft 4a by a single-acting lifting hydraulic cylinder 4. A threshing device 5 having a feed chain 6 and a grain tank 7 for storing grain after threshing are mounted on the traveling machine body 1 side by side. The threshing device 5 is disposed on the left side in the forward direction of the traveling machine body 1, and the Glen tank 7 is disposed on the right side in the forward direction of the traveling machine body 1 (see FIG. 3). A grain discharge auger 8 for discharging the grains in the grain tank 7 to the outside of the machine body is disposed in the grain tank 7.

  A driving unit 10 is provided at the front right side of the traveling machine body 1. The driving unit 10 in front of the Glen tank 7 is provided with an operating device including a step 11 on which the operator gets on, a driver's seat 12, a steering handle 13, various operating levers, and the like. A diesel engine 20 as a power source is disposed in the traveling machine body 1 below the driver seat (seat) 12. Further, when the operator gets on the driver's seat 12, the upper surface of Step 11 functions as a footrest surface. An exhaust gas purification device 90 for purifying the exhaust gas discharged by the diesel engine 20 is provided below the step 11. The details of the exhaust gas purification device 90 will be described later.

  As shown in FIGS. 1 and 2, left and right track frames 21 are arranged on the lower surface side of the traveling machine body 1. The track frame 21 is provided with a drive sprocket 22, a tension roller 23, and a plurality of track rollers 24. The drive sprocket 22 is for transmitting the power of the diesel engine 20 to the traveling crawler 2. The tension roller 23 is for maintaining the tension of the traveling crawler 2. The track roller 24 is for holding the grounding side of the traveling crawler 2 in a grounded state. 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, and the track roller 24 supports the grounding side of the traveling crawler 2.

  As shown in FIGS. 1 and 2, a cutting frame 9 is connected to a cutting rotation fulcrum shaft 4 a of the cutting device 3. The reaping device 3 includes a cutting blade device 47, a culm pulling device 48, a culm conveying device 49, and a weed body 50. The cutting blade device 47 is for cutting the stock of uncut cereal grains in the field, and is composed of a clipper type. The grain raising apparatus 48 is for causing uncut grain grains in the field, and is configured to correspond to four lines in this embodiment. The cereal masher 49 is for conveying the reaped cereals harvested by the cutting blade device 47. The weed body 50 is for weeding the uncut cereal grains in the field into four pieces. A cutting blade device 47 is provided below the cutting frame 9. Further, a grain raising device 48 is disposed in front of the cutting frame 9. Between the grain raising apparatus 48 and the front end portion (feed start end side) of the feed chain 6, a grain production device 49 is arranged. A weeding body 50 projects from the lower part of the grain raising device 48. While the traveling crawler 2 is driven by the diesel engine 20 to move in the field, the reaping device 3 is driven to continuously shave the uncut grain culm on the field.

  As shown in FIGS. 1 and 2, the threshing device 5 includes a handling cylinder 26 for threshing threshing, a swing sorter 27, a tang fan 28, a processing cylinder 29, a dust exhaust fan 30, Is provided. The swing sorting board 27 is configured as a swing sorting mechanism that sorts out the fallen particles falling below the handling cylinder 26. The tang fan 28 is for supplying the sorting wind to the swing sorter 27. The processing cylinder 29 is for reprocessing the threshing discharge taken out from the rear part of the handling cylinder 26. The dust exhaust fan 30 is for discharging dust at the rear part of the swing sorter 27 to the outside of the machine.

  As shown in FIGS. 1 to 3, a waste chain 34 is disposed on the rear end side (feed end side) of the feed chain 6. The waste inherited from the rear end side of the feed chain 6 to the waste chain 34 is discharged to the rear of the traveling machine body 1 in a long state, or by a waste cutter 35 provided on the rear side of the threshing device 5. After being cut to a suitable short length, it is discharged to the rear lower side of the traveling machine body 1. As used herein, “reduction” refers to reeds whose grains have been threshed.

  Below the swing sorter 27, a first conveyor 31 for picking up the grain (the first sort) selected by the swing sorter 27 and a second sort such as a grain with a branch raft are taken out. A second conveyor 32 is provided. In the present embodiment, the traveling machine body 1 is horizontally provided on the upper surface side of the traveling machine body 1 in a side view in order of the first conveyor 31 and the second conveyor 32 from the front side in the traveling direction.

  As shown in FIGS. 1 to 3, the swing sorter 27 is configured to swing sort (specific gravity sort) the cereal grains that have fallen below the handling cylinder 26. The grain that has fallen from the rocking sorter 27 (the first sort) is removed from the grain by the sorting wind from the tang fan 28 and falls first onto the conveyor 31. A first cereal cylinder 33 extending in the vertical direction is connected to a terminal portion of the first conveyor 31 that protrudes outward from one side wall (in the embodiment, the right side wall) of the threshing device 5 that is close to the grain tank 7. Yes. The grain taken out from the first conveyor 31 is carried into the Glen tank 7 by a first cereal conveyor (not shown) in the first cereal cylinder 33 and collected in the Glen tank 7.

  Oscillating sorter 27 is the second conveyor for second sorts such as grain with branches and stems (reduction reprocessed product for resorting in which grain and sawdust etc. are mixed) by swing sorting (specific gravity sorting). It is comprised so that it may fall to 32. The second sorting product taken out by the second conveyor 32 is returned to the upper surface side of the swing sorting board 27 via the second reduction cylinder 36 and the second processing unit 37 and is again sorted. Further, sawdust, dust, and the like in the crushed material from the handling drum 26 are discharged toward the farm field from the rear part of the traveling machine body 1 by the sorting wind from the Kara fan 28.

  Next, the diesel engine 20 will be described with reference to FIGS. 4 to 6. FIG. 4 is a side view showing the intake and exhaust structures of the diesel engine from the left side of the combine. FIG. 5 is a front view showing an intake structure and an exhaust structure of the diesel engine. FIG. 6 is a plan view showing a state of an intake structure and an exhaust structure of a diesel engine.

  As shown in FIG. 4, the diesel engine 20 is disposed in an engine room 79 partitioned by a wall (not shown) inside the combine, and the engine room 79 is disposed below the driver seat 12. . The diesel engine 20 is fixed by an unillustrated frame or the like in the engine room 79 and supported from below by an engine support surface (inner bottom surface of the engine room) 79a of the engine room 79. As described above, the driver seat 12 is provided with the step 11 for the operator to place his / her foot, and the step 11 is arranged adjacent to a part of the front surface of the engine room 79.

  In the present embodiment, the footrest surface of Step 11 (the upper surface of Step 11) is positioned above the bottom surface of the engine room 79, that is, the engine support surface 79a supporting the diesel engine 20. Step 11 is formed. As a result, a space is created between the step 11 and the bottom of the traveling machine body 1 and on the front side of the diesel engine 20 (the front part of the engine room 79). A part of the exhaust structure described later is disposed in this space.

  The diesel engine 20 will be described. The diesel engine 20 includes a cylinder block (not shown) having a cylinder head 60 fastened to the upper surface. As shown in FIGS. 4 to 6, a turbocharger 61 is attached to the cylinder head 60. The turbocharger 61 is disposed on the front side of the diesel engine 20 and at a high position of the diesel engine 20, and includes a turbine case 62 including a turbine wheel (not shown) and a blower wheel (not shown). And a compressor case 63.

  As shown in FIG. 4, an output shaft 83 projects leftward from the diesel engine 20, and a flywheel 84 is provided on the output shaft 83. The flywheel 84 is fixed with a working unit driving pulley 85 that transmits driving force to the reaping device 3 and the threshing device 5, and a traveling driving pulley 87 that transmits driving force from the transmission case 86 to the traveling crawler 2. An output unit is configured.

  As shown in FIGS. 5 and 6, a water-cooling radiator 76 for the diesel engine 20 and an air-cooling cooling fan 77 for the diesel engine 20 are arranged on the right side of the diesel engine 20. The cooling fan 77 is disposed on the right side of the engine room 79 in which the diesel engine 20 is installed.

  Next, the intake structure of the diesel engine 20 will be described. As shown in FIGS. 4 to 6, the air supply side of the air cleaner 71 is connected to the air supply side of the compressor case 63 via the air supply pipe 70. An air supply intake side of the air cleaner 71 is connected to the precleaner 72 through an air supply duct 73. An air supply manifold 75 is disposed on the rear surface side of the cylinder head 60, and the air supply manifold 75 is connected to the air supply / discharge side of the compressor case 63 via a supercharging pipe 74. That is, outside air sucked into the air cleaner 71 from the precleaner 72 is removed by the air cleaner 71 and then supplied from the air supply manifold 75 to each cylinder of the diesel engine 20.

  Next, the exhaust structure of the diesel engine 20 will be described. As shown in FIG. 5, an exhaust manifold 64 is disposed on the front side of the diesel engine 20 on the front side of the cylinder head 60. The exhaust gas purification device 90 is disposed on the side where the exhaust manifold 64 is disposed, that is, on the front side of the diesel engine 20. The exhaust gas purification device 90 of this embodiment includes a urea supply tank device 66, a NOx catalyst unit 68, and a DPF unit 65. The DPF section 65 is for collecting particulate matter (PM) and the like in the exhaust gas. The NOx catalyst unit 68 is for reducing and detoxifying nitrogen oxides (NOx) in the exhaust gas. Hereinafter, the exhaust structure will be described from the upstream side to the downstream side according to the exhaust gas discharge direction.

  An exhaust manifold 64 is connected to the exhaust gas intake side of the turbine case 62, while a first exhaust pipe 91 is connected to the exhaust gas discharge side of the turbine case 62. As shown in FIG. 5, the first exhaust pipe 91 is formed so as to be substantially U-shaped sideways when viewed from the front, and the exhaust gas discharge side (left side) of the turbine case 62 and the exhaust gas of the DPF unit 65. The inflow side (left side) is connected to the front side of the diesel engine 20. Further, as shown in FIG. 4, the first exhaust pipe 91 extends forward to the lower surface side of the step 11 while being inclined downward (partially bent), and the DPF portion 65 It is connected to the first exhaust pipe 91 on the lower surface side and below the turbine case 62. A first exhaust pipe 91 is connected to the exhaust gas inflow side (left side) of the DPF unit 65, while a second exhaust pipe 92 is connected to the exhaust gas discharge side (right side) of the DPF unit 65.

  As shown in FIG. 5, the second exhaust pipe 92 is formed in a laterally substantially U-shape that is opposite to the first exhaust pipe 91 in a front view, and the exhaust gas discharge side ( The right side) and the exhaust gas inflow side (right side) of the NOx catalyst portion 68 are connected on the front side of the diesel engine 20. Further, as shown in FIG. 4, the second exhaust pipe 92 extends forward while inclining downward in a side view, and the NOx catalyst portion 68 is connected to the front lower side of the DPF portion 65. become. The second exhaust pipe 92 is connected to the exhaust gas inflow side (right side) of the NOx catalyst unit 68, while the tail pipe 69 is connected to the exhaust gas discharge side (left side) of the NOx catalyst unit 68.

  An exhaust path from the turbine case 62 to the NOx catalyst portion 68 via the DPF portion 65 is formed in a substantially S shape in front view. In addition, the DPF unit 65 and the NOx catalyst unit 68 are arranged so that the gas flow direction in the DPF unit 65 and the NOx catalyst unit 68 is the left-right direction. Thus, the space in the left-right direction on the front surface of the diesel engine 20 can be effectively used, and both the DPF portion 65 and the NOx catalyst portion 68 can be disposed adjacent to the diesel engine 20. Therefore, the heat generated by driving the diesel engine 20 can be efficiently used to maintain the catalyst temperatures of the DPF unit 65 and the NOx catalyst unit 68. Further, since the DPF unit 65 and the NOx catalyst unit 68 are installed on the side where the exhaust manifold 64 is disposed (front side), the exhaust path from the turbine case 62 to the DPF unit 65 can be formed short, and the exhaust path The configuration can be simplified.

  As shown in FIG. 6, the tail pipe 69 protrudes leftward from the exhaust gas discharge side of the NOx catalyst portion 68 and then extends rearward so as to cross the left side surface of the diesel engine 20. It is formed in a substantially L shape. As shown in FIG. 4, the tail pipe 69 extends rearward and upward while being bent, and the end portion of the tail pipe 69 is opened above the threshing device 5.

  A urea supply tank device 66 as a urea supply device is disposed in front of the NOx catalyst unit 68. As shown in FIG. 4, the urea supply tank device 66 is disposed on the lower surface side of the step 11 and can inject the urea aqueous solution from the exhaust gas inflow side of the NOx catalyst unit 68 by a urea supply pump (not shown) or the like. It is configured. The urea supply tank device 66 is also arranged utilizing the dead space formed below the step 11 and is located in front of the DPF unit 65 and the NOx catalyst unit 68 as described above.

  The first exhaust pipe 91, the second exhaust pipe 92, and a part of the tail pipe 69 are fixed on the front side of the diesel engine 20 using a frame (not shown) that forms the step 11. The DPF portion 65 and the NOx catalyst portion 68 are supported on the lower surface side of the step 11 by the first exhaust pipe 91, the second exhaust pipe 92, and the tail pipe 69 that are fixed by this unillustrated frame. Therefore, a support structure for supporting the DPF unit 65 and the NOx catalyst unit 68 (exhaust gas purification device 90) so as to be separated from the ground can be easily configured without requiring a special bracket. Further, the exhaust gas purifying device 90 can be supported in a state where a certain distance from the ground is secured by using the frame of step 11 arranged at a position higher than the engine support surface 79a. Therefore, even if a part or all of the exhaust gas purification device 90 is exposed to the outside, the exhaust gas purification device 90 can be prevented from contacting an obstacle on the ground. Note that the urea supply tank device 66 disposed in front of the DPF portion 65 and the NOx catalyst portion 68 is also supported by a frame (not shown) that forms the step 11.

  As shown in FIG. 6, the urea supply tank device 66, the NOx catalyst unit 68, and the DPF unit 65 are disposed on the lower surface of step 11 and above the mission case 86. In the present embodiment, the urea supply tank device 66, the NOx catalyst unit 68, and the DPF unit that constitute the exhaust gas purification device 90 by effectively using the space on the lower surface side of the step 11 that was a dead space in the conventional configuration. 65 is arranged. Further, the tail pipe 69 extends to the rear upper side of the traveling machine body 1 using a gap generated above the output portion of the traveling drive pulley 87 and the like, and an exhaust path that effectively utilizes the space generated in each part of the combine. Is formed.

  Next, the DPF unit 65 will be described with reference to FIG. FIG. 7 is a schematic diagram showing the internal structure of the DPF portion 65. As shown in FIG. 7, the DPF portion 65 includes a DPF casing 100 made of a heat-resistant metal material, and substantially cylindrical filter cases 101 and 102 are built in the DPF casing 100. The filter cases 101 and 102 have a structure in which, for example, a diesel oxidation catalyst 103 such as platinum and a soot filter 104 that is a honeycomb filter body are arranged in series.

  Next, the NOx catalyst unit 68 will be described with reference to FIG. FIG. 8 is a schematic diagram showing the internal structure of the NOx catalyst unit 68. As shown in FIG. 8, the NOx catalyst unit 68 includes a NOx catalyst casing 106 made of a refractory metal material. In the NOx catalyst casing 106, substantially cylindrical filter cases 107 and 108 are built. The filter cases 107 and 108 have a structure in which the NOx removal catalyst 105 and the ammonia removal catalyst 109 are accommodated in series. As the NOx removal catalyst 105, a selective catalytic reduction catalyst using urea water as a reducing agent is used. The NOx catalyst unit 68 is configured to function as a silencer (silencer) for purifying exhaust gas and attenuating exhaust sound.

  With this configuration, the exhaust gas discharged from each cylinder of the diesel engine 20 to the exhaust manifold 64 is sent to the DPF unit 65 via the first exhaust pipe 91. After PM is collected by the DPF unit 65, the exhaust gas is sent to the NOx catalyst unit 68 through the second exhaust pipe 92. The exhaust gas from which nitrogen oxides have been rendered harmless by the NOx catalyst unit 68 is discharged upward of the threshing device 5 by the tail pipe 69.

  As described above, the combine according to the present embodiment is configured as follows. That is, the combine includes a traveling machine body 1 on which a diesel engine 20 is mounted, a reaping device 3, a threshing device 5, and a step 11 on which an operator gets on. The diesel engine 20 is disposed in the vicinity of the step 11, and an exhaust gas purification device 90 for purifying the exhaust gas discharged by the diesel engine 20 is disposed on the lower surface side of the step 11.

  Thereby, the exhaust gas purification device 90 can be arranged by effectively utilizing the space on the lower surface side of the step 11. In an airframe structure in which a diesel engine 20 is installed below a driver seat (seat) 12 on which an operator sits, the exhaust gas purification device 90 is assembled in a state in which the diesel engine 20 is approached using a frame forming step 11. be able to. As a result, the configuration for purifying the exhaust gas can be made compact. In this embodiment, exhaust gas is purified using a catalyst that requires a high temperature state. Even in such a case, since the diesel engine 20 is disposed in the vicinity of the exhaust gas purification device 90, the catalyst of the exhaust gas purification device 90 can be efficiently used at a high temperature using the heat of the diesel engine 20. Can be maintained. Further, in the configuration of the present embodiment, the cooling fan 77 is disposed on the right side (side surface) of the diesel engine 20, so the influence of the cooling fan 77 on the lower surface of Step 11 can be eliminated. Therefore, the purification function of the exhaust gas purification device 90 is improved, and the exhaust gas purification device can function effectively even when the combine is operated in a severe temperature environment such as a cold region.

  Further, the combine according to the present embodiment is configured as follows. That is, the exhaust gas purification device 90 includes a DPF portion 65 that collects particulate matter in the exhaust gas of the diesel engine 20 and a NOx catalyst portion 68 that reduces nitrogen oxides in the exhaust gas of the diesel engine 20. Prepare. The DPF portion 65 and the NOx catalyst portion 68 are disposed adjacent to each other on the side where the exhaust manifold 64 of the diesel engine 20 is disposed.

  Thereby, since the DPF portion 65 or the NOx catalyst portion 68 is disposed on the front side of the diesel engine 20 where the exhaust manifold 64 is disposed, the exhaust structure using the DPF portion 65 and the NOx catalyst portion 68 can be configured compactly. Further, by arranging the exhaust manifold 64 on the front side of the engine as in this embodiment, the exhaust path to the DPF part 65 and the NOx catalyst part 68 arranged on the front side of the diesel engine 20 is simplified and simplified. It can be formed efficiently. Moreover, since the DPF part 65 or the NOx catalyst part 68 is disposed adjacent to the diesel engine 20, the temperature of the catalyst can be efficiently maintained.

  In the combine of the present embodiment, a urea supply tank device 66 for supplying urea to the NOx catalyst unit 68 is disposed on the lower surface of step 11.

  Thereby, the urea supply tank device 66 for supplying urea to the NOx catalyst unit 68 can be arranged by effectively utilizing the lower surface side of the step 11. Therefore, the configuration for purifying the exhaust gas can be further compacted.

  Further, the combine according to the present embodiment is configured as follows. Step 11 is disposed adjacent to engine room 79 in which diesel engine 20 is installed, and the footrest surface of step 11 is formed at a position higher than engine support surface 79 a of engine room 79.

  Thus, the exhaust gas purification device 90 can be assembled to the lower surface side of the step by effectively utilizing the vertical space between the lower surface of the engine room 79 and the footrest surface of the step 11. For example, the exhaust gas purifying device 90 can be supported in a state where a certain distance from the ground surface is secured using the frame forming the step 11. Accordingly, it is possible to effectively prevent the exhaust gas purification device 90 from being damaged by the collision of the lower part of the combine with an obstacle on the ground (such as a farm shore or a side groove).

  In this embodiment, the tail pipe 69 is configured to extend toward the rear upper side of the traveling machine body 1, but instead, the tail pipe is configured to extend to the rear lower side of the traveling machine body 1. be able to.

  Although the preferred embodiment of the present invention has been described above, the above configuration can be further modified as follows.

  Initially, the further modification regarding arrangement | positioning of a tail pipe is demonstrated with reference to FIG. In addition, in a modification, the same code | symbol may be attached | subjected to drawing and the description similar to the said embodiment may be abbreviate | omitted.

  As shown in FIG. 9, the tail pipe 169 of the modified example extends in the lateral direction from the exhaust gas discharge side (left side) of the NOx catalyst unit 68, then bends downward, and further extends in the direction extending from the exhaust gas discharge side. It is formed so as to extend once again in the reverse direction (rightward direction), and is substantially U-shaped when viewed from the front. As a result, the exhaust path can be made compact and simple without causing the tail pipe 169 to interfere with other devices. In the modification of FIG. 9, the configuration of parts other than the tail pipe 169 is the same as in the above embodiment.

  Moreover, although the urea supply apparatus of the said embodiment is the structure which arrange | positions the urea supply tank apparatus 66 ahead of the NOx catalyst part 68, it is not necessarily limited to this structure and can change suitably according to a situation. it can. Next, a modification of the urea supply device will be described with reference to FIG.

  In the modification shown in FIG. 10, the urea supply tank device 266 and the urea injection device 267 that constitute the urea supply device are arranged in separate spaces in the space on the lower surface side of the step 11. The urea supply tank device 266 is for storing urea, and is disposed in front of the DPF unit 65 and above the NOx catalyst unit 68. The urea injection device 267 is for injecting the urea supplied from the urea supply tank device 266 into the exhaust gas introduced into the NOx catalyst unit 68, below the DPF unit 65, and in the NOx It is arranged on the back side of the catalyst part 68. In a side view shown in FIG. 10, when a virtual straight line connecting the DPF unit 65 and the NOx catalyst unit 68 and a virtual straight line connecting the urea supply tank device 266 and the urea injection device 267 are considered, both straight lines are considered. Are crossed like a hose. As described above, the configuration of the urea supply device is divided and arranged in the space generated by arranging the DPF unit 65 and the NOx catalyst unit 68, so that the space formed on the lower surface of the step 11 is effectively used. It can be utilized and further space saving can be realized. In addition, in the modification of FIG. 10, about the structure of parts other than a urea supply apparatus, it is the same as that of the said embodiment.

  In the above embodiment, both the DPF unit 65 and the NOx catalyst unit 68 are arranged on the lower surface side of the step 11, but only one of the DPF unit 65 and the NOx catalyst unit 68 is disposed on the lower surface side of the step. It can also be set as the structure arranged in. For example, the DPF may be arranged on the lower surface side of the step, the exhaust pipe from the DPF to the NOx catalyst may be extended rearward, and the NOx catalyst portion may be arranged on the rear side of the traveling machine body 1.

The side view which showed the mode of the whole combine from the left side of the combine which concerns on one Embodiment of this invention. The side view which showed the mode of the whole combine from the right side of a combine. The top view of a combine. The side view which showed the mode of the intake structure and exhaust structure of the diesel engine from the left side of the combine. The front view which showed the mode of the intake structure and exhaust structure of a diesel engine. The top view which showed the mode of the intake structure and exhaust structure of a diesel engine. The schematic diagram which showed the internal structure of the DPF part. The schematic diagram which showed the internal structure of the NOx catalyst part. The front view of the intake structure and exhaust structure of a diesel engine which show the modification regarding arrangement | positioning of a tail pipe. The side view of the intake structure and exhaust structure of a diesel engine which showed the modification regarding the structure of a urea supply apparatus from the left side of the combine.

Explanation of symbols

1 traveling machine body 3 reaping device 5 threshing device 11 step 20 diesel engine 64 exhaust manifold 65 DPF portion 68 NOx catalyst portion 66 urea supply tank device (urea supply device)
90 Exhaust gas purification equipment

Claims (4)

In a combine equipped with a traveling machine body equipped with a diesel engine, a reaping device, a threshing device, and a step on which an operator gets on board,
The said diesel engine is arrange | positioned in the vicinity of the said step, The exhaust-gas purification apparatus for purifying the exhaust gas discharged | emitted by the said diesel engine is arrange | positioned on the lower surface side of the said step, The combine characterized by the above-mentioned. The combine according to claim 1,
The exhaust gas purification device includes a diesel particulate filter that collects particulate matter in the exhaust gas of the diesel engine, and a NOx catalyst that reduces nitrogen oxides in the exhaust gas of the diesel engine,
The combine characterized in that at least one of the diesel particulate filter and the NOx catalyst is arranged adjacent to the side where the exhaust manifold of the diesel engine is arranged. The combine according to claim 2,
The combine is characterized in that at least a part of a urea supply device for supplying urea to the NOx catalyst is disposed on the lower surface of the step. A combine according to any one of claims 1 to 3,
The said step is arrange | positioned so that the engine room which installs the said diesel engine may be adjoined, The footrest surface of the said step is formed in a higher position than the lower surface of the said engine room, The combine.

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