JP2016214105A - Engine device of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine device of a working vehicle capable of supporting a first case 61 and a second case 62 with high rigidity, and simplifying the support structure easily.SOLUTION: In an engine device of a working vehicle equipped with a first case 61 for removing particulate materials in exhaust gas of an engine 20 mounted on a traveling machine body 1 and a second case 62 for removing nitrogen oxide substances in the exhaust gas of the engine 20, which connects the second case 62 to the first case 61 through a urea mixing pipe 39, an engine room 92 is provided in the traveling machine body 1, and the engine 20 is installed in the engine room 92. The first case 61 and the second case 62 are provided in parallel on the upper surface side of the engine room 92.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an engine device for a work vehicle such as a combine harvester that harvests grain by threshing the harvested culm with a threshing device while harvesting uncut grain culm in a field with the harvesting device. More specifically, the present invention is applied to an engine mounted on a work vehicle such as a combine, for example, in particulate matter (soot, particulates) contained in engine exhaust gas, or in engine exhaust gas. The present invention relates to an engine device equipped with an exhaust gas purification device that removes nitrogen oxides (NOx) and the like contained in

  Conventionally, a diesel particulate filter case (hereinafter referred to as a DPF case) and a urea selective reduction catalyst are provided as exhaust gas purifying devices (exhaust gas aftertreatment devices) in the exhaust path of a diesel engine. A technique is known in which a case (hereinafter referred to as an SCR case) is provided, exhaust gas is introduced into the DPF case and the SCR case, and the exhaust gas discharged from the diesel engine is purified (see, for example, Patent Documents 1 to 4). ).

JP 2009-74420 A JP 2012-21505 A JP2013-104394A JP 2012-177233 A

  When assembling the DPF case and the SCR case apart from the engine, the temperature of the exhaust gas supplied from the engine to the DPF case or the SCR case decreases, and regeneration of the diesel particulate filter or selective catalytic reduction action, etc. Therefore, there is a problem that a special device for maintaining the temperature of the exhaust gas in the SCR case at a high temperature is required. There is also a technology to attach the DPF case and the SCR case by attaching the DPF case and the SCR case to the two parallel base frames, and then fastening the two base frames to the installation object, but the DPF case is a heavy component. It is necessary to secure the support rigidity of the SCR case and there is a problem that the support structure of the DPF case and the SCR case cannot be easily simplified.

  On the other hand, when the DPF case and the SCR case are assembled close to the engine, the temperature drop of the exhaust gas supplied from the engine to the SCR case is reduced, and the temperature of the exhaust gas in the SCR case is easily maintained at a high temperature. It is necessary to secure an installation space for the SCR case in the vicinity of the engine, and it is difficult to make the engine room compact, and there is a problem that the DPF case or the SCR case cannot be supported compactly.

  Therefore, the present invention seeks to provide an engine device for a work vehicle that has been improved by examining these current conditions.

  The invention of claim 1 includes a first case for removing particulate matter in exhaust gas of an engine mounted on a traveling machine body, and a second case for removing nitrogen oxides in exhaust gas of the engine. In an engine device for a work vehicle in which the second case is connected to one case via a urea mixing pipe, the traveling machine body is provided with an engine room, and the engine room is installed in the engine room. The first case and the second case are provided in parallel on the upper surface side.

  According to a second aspect of the present invention, in the engine device for a work vehicle according to the first aspect, the urea mixing pipe is extended in parallel with the first case and the second case to be supported in a horizontal orientation. In addition, the exhaust gas moving directions of the first case, the second case, and the urea mixing pipe are formed in the front-rear direction of the traveling machine body.

  According to a third aspect of the present invention, in the engine device for a work vehicle according to the first aspect, the traveling machine body in the vicinity of the engine includes a control unit, and a control seat on which an operator sits is disposed in the control unit. The steering seat is provided on the upper surface side of the front portion of the engine room among the upper surface side of the engine room, and the exhaust gas comprising the first case, the second case, and the urea mixing pipe is disposed on the upper surface side of the rear portion of the engine room. A gas purification device is provided.

  According to a fourth aspect of the present invention, in the engine device for a work vehicle according to the second aspect, the urea mixing pipe is extended in parallel with the first case and the second case that are supported in the horizontal orientation. The exhaust gas moving directions of the first case, the second case, and the urea mixing pipe are formed in the left-right direction of the traveling machine body.

  According to the first aspect of the present invention, there is provided a first case for removing particulate matter in the exhaust gas of the engine mounted on the traveling body, and a second case for removing nitrogen oxides in the exhaust gas of the engine, In an engine device for a work vehicle in which the second case is connected to the first case via a urea mixing pipe, the traveling machine body is provided with an engine room, and the engine room is installed in the engine room. Since the first case and the second case are provided in parallel on the upper surface side of the engine room, the first case and the second case can be compactly supported on the upper surface side of the engine room, and The first case and the second case can be fixed with high rigidity by utilizing a frame for constituting a part. The first case and the second case can be supported with high rigidity, and their support structure can be easily simplified.

  According to the second aspect of the present invention, the urea mixing tube extends along the first case and the second case to be supported in a horizontal horizontal posture, and the urea mixing pipe is extended in parallel with each of the first case and the second case. And the exhaust gas moving directions of the urea mixing pipe are formed in the front-rear direction of the traveling machine body, so that the first case and the second case configured in an integral unit structure on the upper surface side of the engine room, Although the urea mixing tube can be installed in a compact left and right width, an exhaust gas inlet is provided at the front of the first case, and the exhaust gas inlet of the first case can be close to the exhaust outlet of the engine. The temperatures of the first case, the second case, and the urea mixing tube can be easily maintained at a high temperature necessary for gas purification.

  According to a third aspect of the present invention, there is provided a structure in which a traveling unit in the vicinity of the engine is provided with a control unit, and a control seat on which an operator sits is disposed in the control unit. Since the control seat is provided on the upper surface side of the front portion of the room, and the exhaust gas purification device including the first case, the second case, and the urea mixing pipe is provided on the upper surface side of the rear portion of the engine room, Of the upper surface side of the engine room, an installation space for the exhaust gas purification device can be easily secured on the upper surface side behind the control seat, and the exhaust gas purification device can be supported compactly and with high rigidity.

  According to the invention of claim 4, along with the first case and the second case that are supported in the horizontal orientation, the urea mixing tube is extended in parallel with each of the cases, and the first case and the second case And the urea mixing pipes are formed so that the exhaust gas moving directions are in the left-right direction of the traveling machine body, and the first case and the second case configured in an integral unit structure on the upper surface side of the engine room, While the urea mixing tube can be installed in a compact front and rear width, an exhaust gas inlet is provided on the left and right sides of the first case, and the exhaust gas inlet of the first case can be close to the exhaust outlet of the engine, The temperatures of the first case, the second case, and the urea mixing tube can be easily maintained at a high temperature necessary for purifying the exhaust gas.

It is the perspective view which looked at the engine part of the embodiment of the present invention from the right side. It is a top view of the engine part. It is a left view of a combine. It is the same right view. It is the same top view. It is left side explanatory drawing of an engine room part. FIG. 7 is an enlarged explanatory diagram of a main part of FIG. 6. It is front explanatory drawing of an engine room part. FIG. 9 is an enlarged explanatory view of a main part of FIG. 8. It is plane explanatory drawing of an engine room part. It is principal part expansion explanatory drawing of FIG. It is left side explanatory drawing of the engine room part which shows a modification. It is right side explanatory drawing of the engine room part. It is a plane explanatory view of the engine room part. It is urea water supply path | route explanatory drawing of a urea mixing pipe. It is a flowchart of urea water supply control of a urea mixing pipe.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying a combine according to the present invention will be described with reference to the drawings (FIGS. 1 to 11). 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.

  First, the overall structure of the combine will be described with reference to FIGS. As shown in FIGS. 3 to 5, the six-strike combine according to the 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, a six-row mowing device 3 for mowing cereals is mounted by a single-acting lifting hydraulic cylinder 4 so as to be adjustable. 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. In addition, 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.

  A discharge auger 8 for discharging the grains in the grain tank 7 from the rear to the top of the grain tank 7 is disposed. The front part of the glen tank 8 is configured to be able to turn to the side of the machine body around the vertical auger 8a of the discharge auger 8. A steering unit 10 is provided in front of the Glen tank 7 and on the right front of the traveling machine body 1. In the control unit 10, an operation device including a step 11, a control seat 12, a control lever 13, various control levers, switches, and the like on which an operator gets on is arranged. An engine 20 as a power source is disposed in the traveling machine body 1 below the control seat 12. A mission case 19 for transmitting the power of the engine 20 is disposed at the front of the traveling machine body 1.

  As shown in FIGS. 3 and 4, 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 traveling power of the transmission case 19 to the traveling crawler 2, a tension roller 23 that maintains the tension of the traveling crawler 2, and a plurality of members that hold the grounding side of the traveling crawler 2 in a grounded state. A track roller 24 is 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, and the track roller 24 supports the grounding side of the traveling crawler 2.

  As shown in FIG. 3 and FIG. 5, the reaping device 3 includes a 6-row culm pulling device 31 that causes uncut cereals in the field, and a clipper type that cuts the stock of uncut cereals in the field. A cutting blade device 32 and a culm transport device 33 that transports the chopped culm from the culm pulling device 31 to the front end (feed start end side) of the feed chain 6 are provided. An uncut grain culm in the field is pulled up by the culm pulling device 31, the stock of the uncut corn straw is cut by the cutting blade device 32, and the harvested culm is transported to the front end of the feed chain 6 by the culm transporting device 33. Is done.

  The threshing device 5 includes a handling cylinder 51 installed in a handling chamber (not shown), an oscillation sorting board 52 as an oscillation sorting mechanism for sorting shed grains falling below the handling cylinder 51, and an oscillation sorting. The tang fan 53 for supplying the sorting air to the panel 52, the processing cylinder 54 for reprocessing the threshing waste taken out from the rear part of the handling cylinder 51, and the dust discharged from the rear part of the swinging sorting board 52 are discharged outside the machine. A dust exhaust fan 27 is provided.

  As shown in FIGS. 3 and 5, a waste chain 28 is disposed 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 side of the threshing device 5 After being cut to a suitable length by a waste cutter 29 provided on the rear, it is discharged to the lower rear side of the traveling machine body 1.

  Below the rocking sorter 52 are a first conveyor 55 for picking up the grains (the first sort) selected by the rocking sorter 52, and grains, swarf, and grains with branches. A second conveyor 56 is provided to take out the mixed second selection. In addition, the traveling machine body 1 is provided on the upper surface side of the traveling machine body 1 in the order of the first conveyor 55 and the second conveyor 56 from the front side in the traveling direction.

  The swing sorting board 52 is configured to swing-sort (specific gravity sort) the cereal grains that have fallen below the handling cylinder 51 via the receiving net 26. Grains that fall from the oscillating sorter 52 (the first sort) are removed from the grain by the sorter wind from the tang fan 53 and fall first onto the conveyor 55. A first lifting cylinder 57 extending in the upward direction is connected to the terminal end of the first conveyor 55. The grain taken out from the first conveyor 55 is carried into the Glen tank 7 by a first cereal conveyor (not shown) in the first cereal cylinder 57 and collected in the Glen tank 7.

  In addition, the second sorter such as the grain with branch stem (processed for resorting in which grain and sawdust are mixed) is moved from the swing sorter 52 by swing sorting (specific gravity sorting) and wind sorting. It is comprised so that it may fall on the 2nd conveyor 56. FIG. The second sorting product taken out by the second conveyor 56 is returned to the upper surface side of the swing sorting board 52 through the second reduction cylinder 58 and re-sorted. Further, the dust and dust in the crushed material from the handling drum 51 are discharged from the rear part of the traveling machine body 1 toward the field by the sorting air from the tang fan 53 and the dust suction and discharge action of the dust fan 27. .

  Next, referring to FIGS. 1, 2, and 6 to 11, a diesel engine 20, a first case 61 (diesel particulate filter, DPF) and a second case 62 (selection) as the exhaust gas purification device 60 are selected. (Catalyst reduction, SCR) and its mounting structure will be described.

  As shown in FIGS. 1, 2, 6 to 11, a first case 61 as a diesel particulate filter (DPF) that removes particulate matter in the exhaust gas of the diesel engine 20, and the exhaust gas of the diesel engine 20. A second case 62 is provided as a urea selective catalytic reduction (SCR) system for removing nitrogen oxides therein. As shown in FIGS. 2 and 11, the first case 61 is provided with an oxidation catalyst 65 and a soot filter 66. In the second case 62, an SCR catalyst 68 and an oxidation catalyst 69 for reducing urea selective catalyst are installed.

  The first case 61 has an inlet side case 63 and an outlet side case 64. A diesel oxidation catalyst 65 such as platinum that generates nitrogen dioxide (NO 2) is disposed inside the inlet side case 63. A soot filter 66 having a honeycomb structure that continuously oxidizes and removes the collected particulate matter (PM) is replaceably disposed inside an inlet side case 63 and an outlet side case 64 that are flange-connected in a separable manner. In addition to removal of particulate matter (PM) in the exhaust gas of the diesel engine 20 by the diesel oxidation catalyst 65 and the soot filter 66 arranged in series in the movement direction of the exhaust gas in the inlet side case 63 and the outlet side case 64, While reducing the carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas, the SCR catalyst 68 and the oxidation catalyst 69 arranged in series in the movement direction of the exhaust gas in the second case 62 are used for the nitrogen oxide ( NOx) is reduced.

  Further, as shown in FIGS. 7, 9, and 11, the first case 61 and the second case 62 are formed in a long cylindrical shape that extends long in the longitudinal direction of the machine body. A DPF inlet pipe 34 for taking in exhaust gas and a DPF outlet pipe 35 for discharging exhaust gas are provided on both sides of the cylindrical shape of the first case 61 (the front end side and the rear end side in the exhaust gas movement direction). Similarly, an SCR inlet pipe 36 for taking in exhaust gas and an SCR outlet pipe 37 for exhausting exhaust gas are provided on both sides of the cylindrical shape of the second case 29 (the front end side and the rear end side in the exhaust gas movement direction). Yes.

  Further, as shown in FIGS. 1, 2, and 6 to 11, a supercharger 38 for forcibly sending air into the diesel engine 20 is disposed at the exhaust gas outlet (exhaust manifold 15) of the diesel engine 20. ing. Urea which connects the DPF inlet pipe 34 to the supercharger 38 through the exhaust connecting pipe 40 and introduces the exhaust gas of the diesel engine 20 into the first case 61, while connecting the SCR inlet pipe 36 to the DPF outlet pipe 35. A mixing pipe 39 is provided, and exhaust gas is introduced from the first case 28 into the second case 29 via the urea mixing pipe 39. In addition, the exhaust gas outlet pipe 38a of the supercharger 38 provided on the left side on the front side of the fuselage and the exhaust connection pipe 40 connected to the DPF inlet pipe 34 are bent and stretchable by a bellows-like connection pipe 41. The vibration is connected so that the vibration of the diesel engine 20 on the supercharger 38 side is not transmitted to the exhaust connection pipe 40 side.

  In addition, a tail pipe 87 is connected to the SCR outlet pipe 37, and the exhaust gas outlet side of the L-shaped tail pipe 87 is set to the rear side of the fuselage along the front and left sides of the Glen tank 7 from the rear end side of the second case 62. 6 and 7, a urea water tank 71 and a urea water supply device 72, which will be described later, are provided, and the urea water tank from the urea water supply device 72 to the urea water supply portion of the urea mixing pipe 39 is provided. The urea aqueous solution in 71 is sprayed, and the urea water supplied into the urea mixing tube 39 is mixed as ammonia in the exhaust gas from the first case 61 to the second case 62 by hydrolysis. The exhaust gas of the diesel engine 20 (each cylinder) is introduced into the first case 61 from the supercharger 38, moves from the first case 61 to the urea mixing pipe 39, and urea water is mixed with the exhaust gas. Second case Is introduced into the 2, and the exhaust gas in the second case 62 is configured to be released from the tail pipe 87 to the outside (upward between threshing apparatus 5 and the grain tank 7).

  With the above configuration, particulate matter (PM) contained in the exhaust gas of the diesel engine 20 is collected by the soot filter 66 in the first case 61 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 20, the content of carbon monoxide (CO) and hydrocarbon (HC) in the exhaust gas of the diesel engine 20 is reduced. Next, in the urea mixing pipe 39, urea water is injected from the urea water injection valve 199 into the exhaust gas from the diesel engine 20, and the exhaust in the second case 62 mixed with ammonia generated by hydrolysis. The gas is such that the content of nitrogen oxides (NOx) is reduced by the SCR catalyst 68 and the oxidation catalyst 69 for reducing urea selective catalyst, and the first case 61 and the second case as the exhaust gas purification device 60 are used. At 62, the exhaust gas of the diesel engine 20 is purified and discharged from the tail pipe 87 to the outside of the machine.

  Next, as shown in FIGS. 1, 2, and 4 to 9, a rectangular frame-shaped engine room frame 91 as a body frame is erected on the traveling body 1 in front of the Glen tank 7. An engine room 92 is formed. The diesel engine 20 is supported in an anti-vibration manner on the upper surface side of the traveling machine body 1, and the diesel engine 20 is installed in the engine room 92. On the right side of the engine room 92, a cooling air intake case 90, a water cooling radiator 93, and a radiator cooling are provided. A fan 94 is provided.

  Further, a room cover plate 96 is stretched between the front side and the upper side of the engine room frame 91, and the front side and upper side of the diesel engine 20 (engine room frame 91) are closed by the room cover plate 96. Yes, with the radiator cooling fan 94 on the right side of the diesel engine 20, the outside air for cooling is taken into the engine room 92 from the lower right side of the engine room frame 91 via the cooling air intake case 90 to cool the diesel engine 20. The warm air after cooling the diesel engine 20 is configured to be discharged toward the right direction of the threshing device 5 as a working unit adjacent to the engine room frame 91 (engine room 92).

  As shown in FIGS. 4 to 9, 12, and 13, a first case 61 and a second case 62 as the exhaust gas purification device 60 are arranged on the rear side of the upper surface of the engine room 92. The first case 61 and the second case 62 are fixed to the case fixing body 81 with a plurality of fastening bands 82, and the case fixing body 81 is bolted to the rear upper surface of the engine room frame 91. 61, the second case 62, and the urea mixing tube 39 are fixed and supported in parallel by a case fixing body 81. The first case 61 and the second case 62 are connected to each other in parallel on the left and right sides via the case fixing body 81. A first case 61 is arranged on the upper left side of the diesel engine 20, a second case 62 is installed in parallel on the right side of the first case 61, and a long cylindrical first case 61 and second Between the cases 62, a cylindrical urea mixing tube 39 elongated in the front-rear direction is extended in parallel to the upper side of each case 61, 62.

  Further, the first case 61 and the second case 62 are connected in parallel by a case fixing body 81 to form a unit, and the front side of the exhaust gas purification device 60 formed by the first case 61 and the second case 62. The control seat 12 is placed on the front upper surface of the room cover plate 96 while the upper surface side is covered by the rear portion of the room cover plate 96. In addition, the heat insulation sheet body 96a is affixed on the inner surface side of the room cover plate body 96 facing the front surface side and the upper surface side of the exhaust gas purification device 60. That is, since an installation space for the exhaust gas purification device 60 (the first case 61 and the second case 62) is secured at the upper rear side of the engine room 92, the volume of the engine room 92 or the exhaust gas purification device 60 (the first case 61 and the first case 61) is secured. Second case 62) The volume is not limited. Further, the differential pressure sensor 83 is connected to the first case 61, and the clogging state of the soot filter 66 is detected by the differential pressure sensor 83.

  In addition, the diesel engine 20 installation part (engine room 92), the first case 61 or the first case 61 or the second case 62 is surrounded by a room cover plate 96 on the front side and the upper side of the first case 61 or the first case 61 or the second case 62. 2 It is possible to prevent the operator sitting on the control seat 12 from coming into contact with the exhaust gas purification device 60 such as the case 62, and to maintain the cooling efficiency of the diesel engine 20 or the sound insulation of the diesel engine 20. However, the exhaust gas temperature in the first case 61 or the second case 62 can be properly maintained.

  Moreover, the first case 61 or the second case is located at a position separated from the diesel engine 20 within a range where the temperature of the exhaust gas supplied to the first case 61 or the second case 62 does not decrease (the self-regeneration capability does not decrease). The installation part of the case 62 can be easily formed. When the diesel engine 20 is stopped, it is possible to prevent the surroundings of the diesel engine 20 from becoming hot due to heat radiation of the first case 61 or the second case 62, and the low heat resistance that is installed around the diesel engine 20 Adverse effects such as damage to other parts (harness, etc.) can be reduced. Further, the engine cover 92 can be attached to a cargo handling device such as a chain block or a hoist by suspending and attaching the exhaust gas purification device 60, which is a heavy component, by opening and removing the room cover plate 96. Thus, operations such as attachment or removal of the exhaust gas purification device 60 (the first case 61 or the second case 62) configured as a single component can be easily performed.

  Further, as shown in FIGS. 3, 6, and 7, an air cleaner 43 that supplies outside air to the diesel engine 20 and a pre-cleaner 44 that takes outside air into the air cleaner 43 are provided. An air cleaner cover body 48 is provided on the rear upper surface of the room cover plate 96, and the air cleaner 43 is installed in the air cleaner chamber formed by the air cleaner cover body 48. A cleaner column 49 is erected, the precleaner 44 is supported on the right front portion of the threshing device 5 via the precleaner column 49, and the air cleaner 43 is connected to the precleaner 44 via the air supply pipe 45. An EGR device (exhaust gas recirculation device) 47 is provided in the intake manifold 46 of the diesel engine 20. Combustion air (fresh air) is taken into the intake manifold 46 of the diesel engine 20 from the precleaner 44 via the air cleaner 43 via the EGR device (exhaust gas recirculation device) 47.

  Next, a modification of the mounting structure of the exhaust gas purifying device 60 (the first case 61 and the second case 62) will be described with reference to FIGS. As described above, in FIGS. 1 to 11, the exhaust gas purification device 60 (the first case 61 and the second case 62) is arranged so that the movement direction of the exhaust gas is in the longitudinal direction of the body. As shown in FIG. 14, the exhaust gas purifying device 60 (the first case 61 and the second case 62) may be arranged so that the movement direction of the exhaust gas is the left-right direction of the body. That is, in the modification of FIGS. 12-14, the 1st case 61 and the 2nd case 62 are comprised in the elongate cylindrical shape extended long in the body left-right direction. 1 to 11, the first case 61 and the second case 62 are fixed to the case fixing body 81 with a plurality of fastening bands 82, and the first case 61 and the second case 62 are fixed to the case fixing body 81. Units are connected in parallel.

  In addition, in the modified examples of FIGS. 12 to 14, the longitudinal direction of the machine body is long between the first case 61 and the second case 62 that are long in the lateral direction of the body, and above the cases 61 and 62. A cylindrical urea mixing tube 39 is extended in parallel, and a case fixing body 81 is bolted to the rear upper surface of the engine room frame 91. The exhaust gas purifying device 60 (first) is supported in a horizontal orientation. The front side and the top side of the first case 61, the second case 62, and the urea mixing tube 39) are covered with the rear portion of the room cover plate 96. The exhaust gas movement directions of the first case 61, the second case 62, and the urea mixing pipe 39 are formed in the left-right direction of the traveling machine body 1. On the upper surface side of the engine room 92, the first case 61, the second case 62 and the urea mixing pipe 39 configured in an integral unit structure can be installed in a compact front and rear width. For example, the first case 61 is provided on the front side of the fuselage, the exhaust gas inlet of the first case 61 can be brought close to the exhaust outlet of the diesel engine 20, and the second case 62 is provided on the rear side of the fuselage. The exhaust gas outlet of 2 case 62 can be approached.

  Next, referring to FIGS. 6, 13, 15, and 16, the urea aqueous solution is supplied into the urea mixing pipe 39 that connects the exhaust gas inlet of the second case 62 to the exhaust gas outlet of the first case 61. The structure will be described. As shown in FIGS. 6, 13, 15, and 16, a urea water tank 71 that stores the urea aqueous solution for selective catalyst reduction and a urea water supply device 72 that supplies the urea aqueous solution to the urea mixing pipe 39 are provided. A tank base 73 is fixed to the outside of the rear machine of the engine room frame 91, and a urea water tank 71 is detachably mounted on the tank base 73. A urea water tank 71 is arranged between the front surface of the Glen tank 7 and the rear surface of the engine room 92 so that the urea water tank 194 can be replenished into the urea water tank 71 from the outside of the machine between the Glen tank 7 and the engine room 92. ing.

  The urea water supply device 72 includes a urea water pump 76 that pumps the urea aqueous solution in the urea water tank 71, and a urea water supply electric motor 77 that drives the urea water pump 76. A urea water supply pipe 74 or a urea water return pipe 75 as a urea water pipe is connected between the urea water supply devices 72 and a urea water pump is connected to the urea injection portion of the urea mixing pipe 39 via the urea water injection pipe 78. 76 is connected. The urea aqueous solution in the urea water tank 71 is supplied to the urea water injection section provided on the urea water supply side of the urea mixing pipe 39, and the urea aqueous solution is sprayed from the urea water injection section into the urea mixing pipe 39 to mix the urea. The urea water supplied into the pipe 39 is configured to be mixed as ammonia in the exhaust gas from the first case 61 to the second case 62 by hydrolysis.

  Further, as shown in FIG. 15, an engine controller 121 (ECU) that executes fuel injection control of the diesel engine 20 and a urea injection controller 122 (DCU) that controls the urea water pump 76 (or the urea water injection unit) are provided. In addition, the engine controller 121 and the urea injection controller 122 are connected to each other so that an appropriate amount of urea water is supplied into the urea mixing pipe 39 at an appropriate time according to the operating state of the diesel engine 20 or the like. A urea injection controller 122 is connected to the urea water temperature sensor 123 of the urea water tank 71 and the urea water meter 124 of the urea water tank 71. A urea injection controller 122 is connected to a display panel 125 such as a liquid crystal display provided in the control unit 10 so that the urea water temperature or the amount of urea aqueous solution in the urea water tank 71 is displayed to the operator. Yes.

  As shown in FIG. 15, the engine controller 121 is connected to a battery (not shown) via a key switch 126 for applying power, and an alarm device 127 such as a buzzer or a lamp is connected to the input side of the engine controller 121. When the urea aqueous solution temperature in the urea water tank 71 is below the freezing temperature, or when the urea aqueous solution amount in the urea water tank 71 is below a predetermined amount, the alarm device 127 is operated by turning on the key switch 126. It is configured to alarm.

  Then, as shown in the flowchart (SCR supply control) of FIG. 16, when the key switch 126 is switched to the engine operation position by the operator and the warm-up operation of the diesel engine 20 is executed, the cooling water thermometer value of the diesel engine 20 is When the engine rotation sensor value, the urea water temperature sensor 123 value, the urea water amount meter 124 value, the work clutch sensor value operated by the work clutch lever or the like are read and the urea water temperature is equal to or higher than a predetermined value, When the urea water pump 76 is held in an operable state (a state of urea water injection OK), and when the operation clutch sensor is detected by the operation clutch sensor, the urea water injection start control is performed. Is executed to control the operation of the urea water supply electric motor 77 (urea water pump 76) and the like.

  When the urea water supply electric motor 77 (urea water pump 76) or the like is operated, urea water is supplied into the urea mixing pipe 39, and the urea aqueous solution in the urea water tank 71 is supplied into the urea mixing pipe 39. In the exhaust gas from the first case 61 to the second case 62, ammonia (generated by hydrolysis of urea water) is mixed, and the SCR catalyst 68 and the oxidation catalyst 69 for urea selective catalyst reduction in the second case 62 are mixed. As a result, nitrogen oxides (NOx) in the exhaust gas of the diesel engine 20 are reduced. When the key switch 126 is switched to the engine operating position and the warming-up operation of the diesel engine 20 is executed, if the urea aqueous solution temperature is equal to or lower than the predetermined temperature, the alarm device 127 is operated to turn on the urea water tank 71. While alerting the freezing of the urea aqueous solution, the urea aqueous solution is circulated between the urea water tank 71 and the urea water supply device 72 via the urea water return pipe 75 to prevent the urea aqueous solution from freezing.

  As shown in FIGS. 1 to 11, a first case 61 for removing particulate matter in the exhaust gas of the diesel engine 20 mounted on the traveling machine body 1 and a first case for removing nitrogen oxides in the exhaust gas of the diesel engine 20. In an engine device for a working vehicle that includes two cases 62 and connects the second case 62 to the first case 61 via the urea mixing pipe 39, the traveling machine body 1 is provided with an engine room 92, and the diesel engine 20 is placed in the engine room 92. In this structure, a first case 61 and a second case 62 are provided in parallel on the upper surface side of the engine room 92. Therefore, the first case 61 and the second case 62 can be compactly supported on the upper surface side of the engine room 92, and the first case 61 and the engine case frame 91 for constituting a part of the engine room 92 can be utilized. The second case 62 can be fixed with high rigidity. The first case 61 and the second case 62 can be supported with high rigidity, and their support structure can be easily simplified.

  As shown in FIGS. 1 to 11, a urea mixing tube 39 extends along the first case 61 and the second case 62 that are supported in a horizontal horizontal posture, in parallel with the cases 61 and 62, and the first case 61 and the second case 62. The exhaust gas movement directions of the case 61, the second case 62, and the urea mixing pipe 39 are formed in the front-rear direction of the traveling machine body 1. Therefore, the first case 61 and the second case 62 configured in an integral unit structure and the urea mixing tube 39 can be installed on the upper surface side of the engine room 92 compactly in the left-right width. The exhaust gas inlet of the first case 61 can be close to the exhaust outlet of the diesel engine 20, and the first case 61, the second case 62, and the urea mixing pipe 39 are heated to a high temperature necessary for exhaust gas purification. The temperature of can be easily maintained.

  As shown in FIGS. 1 to 11, a traveling body 1 in the vicinity of a diesel engine 20 includes a control unit 10, and a control seat 12 on which an operator sits is disposed on the control unit 10. Among them, the control seat 12 is provided on the upper surface side of the front part of the engine room 92, and the exhaust gas purification device 60 including the first case 61, the second case 62, and the urea mixing pipe 39 is provided on the upper surface side of the rear part of the engine room 92. Provided. Therefore, an installation space for the exhaust gas purification device 60 can be easily secured on the upper surface side behind the control seat 12 in the upper surface side of the engine room 92, and the exhaust gas purification device 60 can be supported compactly and with high rigidity.

  As shown in FIGS. 12 to 14, a urea mixing tube 39 extends along the first case 61 and the second case 62 that are supported in a horizontal horizontal posture, in parallel with the cases 61 and 62, and the first case 61 and the second case 62. The exhaust gas movement directions of the case 61, the second case 62, and the urea mixing pipe 39 are formed in the left-right direction of the traveling machine body 1. Accordingly, the first case 61 and the second case 62 configured in an integral unit structure and the urea mixing tube 39 can be installed on the upper surface side of the engine room 92 in a compact size in the front-rear direction. The exhaust gas inlet of the first case 61 can be brought close to the exhaust outlet of the diesel engine 20 by providing an exhaust gas inlet in the part, and the first case 61 and the second case 62 and the urea mixing pipe are heated to a high temperature necessary for purification of the exhaust gas. The temperature of 39 can be easily maintained.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 10 Control part 12 Control seat 39 Urea mixed pipe 60 Exhaust gas purification apparatus 61 1st case 62 2nd case 92 Engine room

Claims (4)

A first case for removing particulate matter in the exhaust gas of an engine mounted on a traveling machine body and a second case for removing nitrogen oxides in the exhaust gas of the engine are provided, and a urea mixing pipe is provided in the first case. In the engine device of the work vehicle for connecting the second case via
An engine room is provided in the traveling machine body, and the engine is installed in the engine room, wherein the first case and the second case are provided in parallel on the upper surface side of the engine room. Engine device for work vehicle.   Along with the first case and the second case supported in a horizontal orientation, a urea mixing pipe is extended in parallel with each case, and each exhaust gas of the first case, the second case, and the urea mixing pipe is extended. The engine device for a work vehicle according to claim 1, wherein a moving direction is formed in a front-rear direction of the traveling machine body.   A structure in which a traveling unit near the engine is provided with a control unit, and a control seat on which an operator sits is disposed in the control unit, and the upper surface side of the engine room is on the upper surface side of the engine room front side. 2. The work vehicle according to claim 1, wherein an exhaust gas purification device including the first case, the second case, and a urea mixing pipe is provided on the upper surface side of the rear portion of the engine room. Engine equipment. Along with the first case and the second case supported in a horizontal orientation, a urea mixing pipe is extended in parallel with each case, and each exhaust gas of the first case, the second case, and the urea mixing pipe is extended. 2. The engine device for a work vehicle according to claim 1, wherein a moving direction is formed in a left-right direction of the traveling machine body.

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