WO2015012168A1 - Véhicule de travail - Google Patents

Véhicule de travail Download PDF

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Publication number
WO2015012168A1
WO2015012168A1 PCT/JP2014/068905 JP2014068905W WO2015012168A1 WO 2015012168 A1 WO2015012168 A1 WO 2015012168A1 JP 2014068905 W JP2014068905 W JP 2014068905W WO 2015012168 A1 WO2015012168 A1 WO 2015012168A1
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WO
WIPO (PCT)
Prior art keywords
case
urea
engine
urea water
exhaust gas
Prior art date
Application number
PCT/JP2014/068905
Other languages
English (en)
Japanese (ja)
Inventor
雄作 岡村
義秋 黒川
Original Assignee
ヤンマー株式会社
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Filing date
Publication date
Application filed by ヤンマー株式会社 filed Critical ヤンマー株式会社
Publication of WO2015012168A1 publication Critical patent/WO2015012168A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K13/00—Arrangement in connection with combustion air intake or gas exhaust of propulsion units
    • B60K13/04—Arrangement in connection with combustion air intake or gas exhaust of propulsion units concerning exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/20—Off-Road Vehicles
    • B60Y2200/22—Agricultural vehicles
    • B60Y2200/221—Tractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a work vehicle such as an agricultural machine (tractor, combine) or a construction machine (bulldozer, hydraulic excavator, loader) equipped with an engine, and more specifically, particulate matter (soot, contained in exhaust gas).
  • a work vehicle such as a tractor provided with an exhaust gas purifying device for removing particulate oxide or nitrogen oxides (NOx) contained in the exhaust gas.
  • an opening / closing fulcrum shaft is arranged at the rear of the bonnet for covering the engine in order to improve the efficiency of maintenance work of the engine arranged at the front of the traveling machine body.
  • the bonnet was rotated.
  • a filter case having a diesel particulate filter and a catalyst case having a urea selective reduction catalyst are provided as exhaust gas purifiers (exhaust gas aftertreatment devices) in the exhaust path of a diesel engine.
  • exhaust gas purifiers exhaust gas aftertreatment devices
  • the urea water tank is installed using a space below the operation unit. Therefore, there is a problem that the temperature of the urea water in the urea water tank decreases during cold work, etc., and it is necessary to provide a special means for maintaining the temperature of the urea water supplied to the urea mixing pipe above a predetermined level. There is also.
  • the present invention seeks to provide a work vehicle that has been improved by examining these current conditions.
  • a work vehicle includes a driving unit on which an operator is boarded, a first case for removing particulate matter in engine exhaust gas, and an engine exhaust gas in engine exhaust gas.
  • a work vehicle including a second case for removing nitrogen oxides, a urea mixing pipe connecting the second case to the first case, and a urea water tank for supplying urea water to the urea mixing pipe
  • the engine is disposed on the traveling machine body, wherein a tank support is provided between the rear part of the engine and the front part of the operating part, and the urea water tank is attached to the traveling machine body via the tank support.
  • the urea water tank is disposed at a rear portion of an engine room formed by a bonnet that covers the engine, and the urea water tank is disposed on a front side of the urea water tank.
  • the urea mixing tube is extended.
  • the urea water tank is disposed such that the front side of the front column of the driving unit can be closed, and the rear part of the engine room inside the hood where the engine is disposed. And the urea water tank as a partition member in front of the operation unit.
  • the urea mixing pipe extends in a direction crossing the exhaust gas movement direction of the first case between the rear part of the engine and the front part of the urea water tank. It has been set up.
  • the operating unit on which the operator is boarded the first case for removing particulate matter in the exhaust gas of the engine, and the second for removing nitrogen oxides in the exhaust gas of the engine.
  • a work vehicle comprising a case, a urea mixing pipe that connects the second case to the first case, and a urea water tank that supplies urea water to the urea mixing pipe
  • the engine is disposed in a traveling machine body in front of the driving unit.
  • the tank support is provided between the rear part of the engine and the front part of the operating part, and the urea water tank is attached to the traveling machine body via the tank support.
  • the urea water tank can be satisfactorily kept warm using the exhaust heat of the water, the generation of urea crystal lumps can be prevented, and the urea water tank can be installed in a highly rigid traveling machine body. Or the like can easily improve the support rigidity of the link.
  • the urea water tank is disposed in the rear part of the engine room formed by the hood that covers the engine, and the urea mixing pipe is extended on the front side of the urea water tank. Therefore, the urea mixing pipe and the urea water tank can be compactly installed inside the fuselage, and the urea water mixing tank and the urea mixing tank are arranged along the urea mixing pipe on the front side of the urea water tank. The temperature of both of the pipes can be easily managed, and the urea water tank and the urea mixing pipe can be kept warm.
  • the urea water tank is disposed so that the front column front side of the operating unit can be closed, and a partition between the rear of the engine room inside the hood where the engine is disposed and the front of the operating unit. Since the urea water tank is configured as a member, the urea water tank can be kept warm by utilizing exhaust heat of the engine, etc., but more heat insulating or soundproof than the conventional partition plate body Can be improved easily.
  • the exhaust gas in the first case is moved from the engine front portion where the cooling fan is disposed toward the engine rear portion where the flywheel housing is disposed. Since the urea mixing pipe is extended between the rear part of the engine and the front part of the urea water tank in a direction crossing the exhaust gas movement direction of the first case, The urea mixing pipe can be compactly arranged between the rear part of the engine and the front part of the urea water tank, and the urea mixing pipe is heated by heat generated on the engine side, and the work is performed in a cold region.
  • the temperature of the urea aqueous solution in the urea mixing tube can be easily maintained, and the crystallization of urea water in the urea mixing tube can be reduced. That is, the urea mixing pipe is heated by the heat generated by the engine or the first case, and the crystallization of the urea water in the urea mixing pipe can be reduced, and the urea water is mixed with the exhaust gas as ammonia.
  • the length of the urea mixing tube heating part heated by the heat generated by the engine can be made longer than necessary or longer, and nitrogen oxides in the exhaust gas in the second case can be removed.
  • the exhaust gas hatching function can be improved.
  • FIGS. 1 to 6 a farm tractor 1 equipped with a diesel engine will be described with reference to FIGS.
  • a farm tractor 1 as a work vehicle shown in FIGS. 1 and 2 is configured to perform a plowing work and the like for plowing a farm field by mounting a plow working machine (not shown).
  • FIG. 1 is a perspective view of the tractor 1
  • FIG. 2 is a plan view thereof.
  • the left side in the forward direction of the tractor 1 is simply referred to as the left side
  • the right side in the forward direction is also simply referred to as the right side.
  • a farm tractor 1 as a work vehicle supports a traveling machine body 2 with a pair of left and right front wheels 3 and a pair of left and right rear wheels 4, and a diesel engine at the front of the traveling machine body 2. 5 and driving the rear wheel 4 and the front wheel 3 with the diesel engine 5, the vehicle is configured to travel forward and backward.
  • the upper surface side and the left and right side surfaces of the diesel engine 5 are covered with an openable / closable bonnet 6.
  • a driving cabin 7 is installed as a driving unit on which an operator gets on.
  • a front column 10 including a control seat 8 on which an operator sits, a control handle 9 as steering means, and the like.
  • a fuel tank 12 that supplies fuel to the diesel engine 5 is provided below the boarding step 11 at the bottom of the cabin 7.
  • left and right brake pedals 13, a clutch pedal 14, a transmission pedal 15, a forward / reverse switching lever 16 and the like are disposed as steering devices.
  • the traveling machine body 2 also includes a mission case 17 for shifting the output from the diesel engine 5 and transmitting it to the rear wheels 4 (front wheels 3).
  • the rear of the mission case 17 is connected to a tiller mechanism (not shown) and the like via a traction mechanism 21 such as a left and right lower link 18, a top link 19, and a left and right lift arm 20, and the like.
  • the plowing machine and the like are driven by a PTO shaft (not shown) provided on the rear side surface of 17.
  • the traveling machine body 2 of the tractor 1 includes a diesel engine 5, a transmission case 17, a clutch case 22 that connects them, a front chassis 23 that extends forward from the diesel engine 5, and the like.
  • a pair of left and right boarding steps 24 for the operator to get on and off are arranged on the left and right outer portions of the cabin 7.
  • an intake manifold 33 is disposed on one side surface of the cylinder head 32 of the diesel engine 1.
  • the cylinder head 32 is mounted on a cylinder block 35 in which an engine output shaft (crank shaft) and a piston (not shown) are incorporated.
  • An exhaust manifold 36 is disposed on the other side of the cylinder head 32, and the front end and the rear end of the engine output shaft are projected from the front and rear surfaces of the cylinder block 35.
  • a flywheel housing 38 is fixed to the rear surface of the cylinder block 35.
  • a flywheel (not shown) is provided in the flywheel housing 38.
  • the front side of the clutch case 22 is connected to the rear side of the flywheel housing 38.
  • the power of the diesel engine 5 is extracted from the rear end side of the engine output shaft on which the flywheel is pivoted toward the transmission case 17.
  • an oil pan 39 is disposed on the lower surface of the cylinder block 35
  • a cooling fan 40 is disposed on the front surface side of the cylinder block 35
  • a radiator 41 is installed facing the cooling fan 40.
  • An oil cooler 42, an air cleaner 43, a battery 44, and the like are disposed on the front chassis 23 in front of the radiator 41.
  • the intake manifold 33 is provided with an exhaust gas recirculation device (EGR) 45 for taking in exhaust gas for recirculation.
  • EGR exhaust gas recirculation device
  • An air cleaner 43 shown in FIG. 4 is connected to the intake manifold 33. The external air that has been dedusted and purified by the air cleaner 43 is sent to the intake manifold 33 and supplied to each cylinder of the diesel engine 5.
  • a cooling water pump 46 for circulating cooling water in the cylinder block 35 and the radiator 41 is provided.
  • a cooling water pump 46 is arranged on the cooling fan 40 installation side on the front side of the diesel engine 5.
  • the cooling water pump 46 and the cooling fan 40 are connected to the engine output shaft of the diesel engine 5 via a V belt or the like, and the cooling water pump 46 and the cooling fan 40 are driven. While the cooling water is fed from the cooling water pump 46 into the cylinder block 35 via the EGR cooler 47 of the exhaust gas recirculation device 45, the diesel engine 5 is cooled by the cooling fan 40 wind. .
  • each of the four cylinders 51 of the diesel engine 5 includes a fuel pump 52 and a common rail 53 that connect the fuel tank 12 shown in FIG.
  • a common rail 53 and a fuel filter 54 are arranged on the intake manifold 33 installation side of the cylinder head 32, and a fuel pump 52 is arranged in the cylinder block 35 below the intake manifold 33.
  • Each injector 51 has an electromagnetic switching control type fuel injection valve (not shown).
  • the common rail 53 is connected to the discharge side of the fuel pump 52, and the cylindrical common rail 53 is connected to each injector 51 of the diesel engine 5. It is connected.
  • the surplus of the fuel pumped from the fuel pump 52 to the common rail 53 is returned to the fuel tank 12, high-pressure fuel is temporarily stored in the common rail 53, and the high-pressure fuel in the common rail 53 is used for each diesel engine 5. Supplied inside the cylinder.
  • the fuel in the fuel tank 12 is pumped to the common rail 53 by the fuel pump 52, the high-pressure fuel is stored in the common rail 53, and the fuel injection valves of the injectors 51 are controlled to open and close.
  • High-pressure fuel in the common rail 53 is injected into each cylinder of the diesel engine 5. That is, by electronically controlling the fuel injection valve of each injector 51, the fuel injection pressure, injection timing, and injection period (injection amount) can be controlled with high accuracy. Therefore, nitrogen oxides (NOx) discharged from the diesel engine 5 can be reduced.
  • NOx nitrogen oxides
  • a first case 62 as a curate filter (DPF) and a second case 63 as a urea selective catalytic reduction (SCR) system for removing nitrogen oxides in exhaust gas of the diesel engine 1 are provided.
  • DPF curate filter
  • SCR selective catalytic reduction
  • an oxidation catalyst 64 and a soot filter 65 are provided in the first case 62.
  • the second case 63 includes an SCR catalyst 66 and an oxidation catalyst 67 for reducing urea selective catalyst.
  • Exhaust gas discharged from each cylinder of the diesel engine 5 to the exhaust manifold 36 is discharged to the outside via the exhaust gas purification device 61 and the like.
  • the exhaust gas purification device 61 is configured to reduce carbon monoxide (CO), hydrocarbons (HC), particulate matter (PM), and nitrogen oxides (NOx) in the exhaust gas of the diesel engine 5. is doing.
  • the first case 62 is configured in a horizontally long and long cylindrical shape extending long in a direction parallel to the output shaft (crankshaft) of the diesel engine 5 in a plan view.
  • a DPF inlet pipe 68 for taking in exhaust gas is provided on one end of the first case 62 in the cylindrical shape.
  • the one end side and the other end side of the first case 62 in the exhaust gas movement direction can be attached to and detached from the front and rear surfaces of the cylinder head 32 via the front support leg body 69 and the rear support leg body 70. I support it. That is, the first case 62 is attached to the upper surface side of the diesel engine 5 through the front support leg 69 and the rear support leg 70.
  • the first case 62 is supported in parallel with the exhaust manifold 36 with the longitudinal direction of the cylindrical first case 62 facing the longitudinal direction of the diesel engine 5.
  • a supercharger 71 for forcibly sending air to the diesel engine 5 is disposed at the exhaust gas outlet of the exhaust manifold 36.
  • the DPF inlet pipe 68 is communicated with the exhaust manifold 36 via the supercharger 71, and the exhaust gas of the diesel engine 5 is introduced into the first case 62 from the DPF inlet pipe 68.
  • a DPF outlet pipe 72 for exhaust gas exhaust is provided on the other end side of the cylindrical shape of the first case 62.
  • the DPF outlet pipe 72 of the first case 62 is connected to the inlet side of the urea mixing pipe 73, and the exhaust gas of the first case 28 is introduced into the urea mixing pipe 73.
  • the second case 63 is configured in a vertically long elongated cylindrical shape extending long in the vertical direction.
  • An SCR inlet pipe 74 for taking in exhaust gas is provided on the lower end side of the cylindrical shape of the second case 63.
  • An SCR inlet pipe 74 is connected to the outlet side of the urea mixing pipe 73 through a bellows-like connecting pipe 75 that can be bent and stretched.
  • the end of the urea mixing pipe 73 to which the bellows-like connecting pipe 75 is connected is detachably fixed to the side surface of the cylinder block 35 with a pipe bracket 76. That is, the urea mixing pipe 73 is fixed to the diesel engine 5 through the first case 62 and the pipe bracket 76.
  • the first case 62 and the urea mixing pipe 73 are attached to the diesel engine 5 supported by vibration isolation. Can be fixed together. The mechanical vibration on the urea mixing pipe 73 side is blocked by the bellows-like connecting pipe 75 and is not transmitted to the SCR inlet pipe 74 side.
  • the lower end side of the tail pipe 81 is connected to the cylindrical upper end side of the second case 63.
  • the tail pipe 81 is erected substantially vertically along the cabin frame 82 at the right corner of the operation cabin 7.
  • the tail pipe 81 and the pipe cover 84 are fixed to the cabin frame 82 via the pipe mounting bracket 83, and the cylindrical upper end side of the second case 63 is detachably fixed to the cabin frame 82 via the case mounting bracket 85. is doing.
  • a step frame 86 is fixed to the side surface of the clutch case 22, and the operation cabin 7 and the entry / exit step 24 are attached to the step frame 86.
  • the end face is bolted so as to be detachable. That is, the back side of the case base 87 is bolted to the front side of the step frame 86, the lower end surface of the cylindrical shape of the second case 63 is brought into contact with the upper side of the case base 87, and the second case 63 is attached to the case base 87.
  • the second case 63 is supported on the step frame 86.
  • the first case 62 is horizontally disposed in the front-rear direction on the upper surface side of the diesel engine 5 (horizontal posture), while the second case 63 is placed in the vertical posture on the right side of the rear portion of the diesel engine 5 via the step frame 86.
  • the first case 62 and the second case 63 can be compactly arranged around the hood 6 and the operation cabin 7 while being supported and capable of functionally forming the exhaust gas movement path of the diesel engine 5.
  • the tank base 90 is fixed to the upper surface side of the traveling machine body 2 (clutch case 22) at the rear of the bonnet 6, and the urea water tank 91 is fixed to the traveling machine body 2 (clutch case 22) via the tank base 90.
  • a urea water tank 91 is mounted on the upper surface side.
  • An oil injection port 92 for the fuel tank 12 is provided in the lower front portion on the left side of the cabin 7, and a water injection port 93 for the urea water tank 91 is provided on the upper surface of the rear portion of the bonnet 6.
  • An oil injection port 92 and a water injection port 93 are disposed on the front surface on the left side of the cabin 57 where the operator gets on and off frequently, and the rear part of the diesel engine 5 (diesel engine 5 and urea water tank 91 is formed in the engine room formed by the bonnet 6.
  • the urea mixing tube 73 is extended and supported in the right and left direction. Further, since the urea water tank 91 is installed between the front part of the front column 10 and the rear part of the diesel engine 5, heat generation and vibration generated on the diesel engine 5 side are absorbed by the urea water tank 91 and transmitted to the front column 10 side. And the temperature of the urea aqueous solution in the urea water tank 91 can be easily maintained even when working in a cold region.
  • Crystallization can be reduced. Moreover, since a space for installing a partition material (a space for heat insulation and a space for vibration and soundproofing) is formed between the front column 10 and the diesel engine 5, the dead space can be used effectively so that the interior of the fuselage (engine The urea water tank 91 can be arranged compactly in the room.
  • a partition material a space for heat insulation and a space for vibration and soundproofing
  • a urea water injection pump 94 that pumps the urea aqueous solution in the urea water tank 91, an electric motor 95 that drives the urea water injection pump 94, and urea that is connected to the urea water injection pump 94 via a urea water injection pipe 96.
  • a water injection nozzle 97 is provided.
  • a urea water injection nozzle 97 is attached to the urea mixing pipe 73 via an injection pedestal 98, and a urea aqueous solution is sprayed from the urea water injection nozzle 97 into the urea mixing pipe 73.
  • the urea water supplied into the urea mixing pipe 73 is configured to be mixed as ammonia in the exhaust gas from the first case 62 to the second case 63.
  • the bellows-like connecting pipe 75 is covered with a heat-resistant heat insulating material 99 such as glass fiber to prevent the exhaust gas temperature in the bellows-like connecting pipe 75 from being lowered, and urea in the exhaust gas is crystallized. Is suppressed.
  • the urea mixing pipe 73 has an elbow pipe part that changes the movement direction of the exhaust gas by about 90 degrees and a long cylindrical straight pipe part that is connected to the SCR inlet pipe 74.
  • An injection pedestal 98 is welded and fixed to an elbow pipe part where the elbow pipe part and the straight pipe part are joined, and an aqueous urea solution is sprayed from the urea water injection nozzle 97 toward the inner hole of the straight pipe part from the elbow pipe part side. To do.
  • the urea mixing pipe 73 Since the urea mixing pipe 73 is installed in the space between the rear part of the diesel engine 5 and the front part of the urea water tank 91, the urea mixing pipe 73 is heated by the heat generated on the diesel engine 5 side, and the exhaust gas in the urea mixing pipe 73 is exhausted. It can suppress that the temperature of (urea aqueous solution) falls, and can reduce the crystallization of the urea water in the urea mixing pipe 73 inside.
  • the oxidation catalyst 64 and the soot filter 65 in the first case 62 reduce carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of the diesel engine 5.
  • urea water from the urea water injection nozzle 97 is mixed into the exhaust gas from the diesel engine 5 inside the urea mixing pipe 73.
  • the SCR catalyst 66 and the oxidation catalyst 67 in the second case 63 reduce nitrogen oxides (NOx) in the exhaust gas in which urea water is mixed as ammonia. That is, exhaust gas with reduced carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) is discharged from the tail pipe 81 to the outside of the machine.
  • an operation cabin 7 as an operation unit on which an operator is boarded
  • a first case 62 for removing particulate matter in the exhaust gas of the diesel engine 5
  • a work vehicle including a second case 63 for removing nitrogen oxides includes a step frame 86 as a traveling machine frame for mounting the driving unit 7 and a case base 87 as a case support for supporting the second case 63.
  • the case frame 87 is arranged on the step frame 86, and the second case 63 is attached to the step frame 86 via the case frame 87.
  • the case base 87 can be installed on the highly rigid step frame 86, the manufacturing cost can be easily reduced by simplifying the size of the case base 87, and the support rigidity of the second case 63 can be easily improved.
  • the assembly workability of the two cases 63 can be easily improved.
  • the second case 63 support structure can be easily simplified as compared with a conventional structure that also supports the second case 63 using the exhaust pipe.
  • a driving unit on which an operator is boarded is configured by a driving cabin 7, and the driving cabin 7 is mounted on a step frame 86.
  • a lower portion of the vertically long second case 63 is attached, and an upper portion of the vertically long second case is connected to a cabin frame 82 as a front corner frame of the operation cabin 7. Therefore, the lower part of the second case 63 can be fixed on the case base 87, the workability of assembling the relatively heavy second case 63 can be improved, and the cabin frame 82 of the operation cabin 7 can be connected to the upper part of the second case 63.
  • the lateral swing of the second case 63 can be easily prevented, and the outer shape of the second case 63 can be compactly formed in a vertically long cylindrical shape that is easy to fit along the cabin frame 82 of the operation cabin 7.
  • an operation cabin 7 is arranged behind a hood 6 in which a diesel engine 5 is installed, and urea water tank 91 for exhaust gas purification and urea water is supplied from the urea water tank 91.
  • a urea mixing pipe 73 is provided, and the exhaust inlet of the second case 63 is connected to the exhaust outlet of the first case 62 via the urea mixing pipe 73, and the steering handle 9 part of the driving cabin 7 and the diesel engine 5 are connected to each other.
  • a urea water tank 91 is installed between them. Therefore, heat generation and vibration generated on the diesel engine 5 side can be suppressed from being transmitted to the operation cabin 7 side, and the urea water tank 91 is heated by the heat generation on the diesel engine 5 side.
  • the temperature of the urea aqueous solution in the urea water tank 91 can be easily maintained, and the crystallization of the urea water can be reduced.
  • the urea water tank 91 can be effectively used as the partition member, and the partition structure between the driving cabin 7 and the diesel engine 5 can be simplified,
  • the urea water tank 91 can be compactly arranged inside the bonnet 6 (engine room).
  • a urea mixing pipe 73 is extended between the rear portion of the diesel engine 5 and the front portion of the urea water tank 91 in a direction crossing the exhaust gas movement direction of the first case 62. I am letting. Therefore, the urea mixing pipe 73 can be arranged compactly between the rear part of the diesel engine 5 and the front part of the urea water tank 91, and the urea mixing pipe 73 is heated by the heat generated on the diesel engine 5 side. Even in the operation, the temperature of the urea aqueous solution in the urea mixing tube 73 can be easily maintained, and the crystallization of the urea water in the urea mixing tube 73 can be reduced.
  • a urea water tank 91 is disposed at the rear of the engine room formed by the bonnet 6 that covers the diesel engine 5, and a urea mixing pipe 73 is provided on the front side of the urea water tank 91. Since it is extended, the urea mixing pipe 73 and the urea water tank 91 can be compactly installed inside the fuselage, and the urea mixing pipe 73 is placed along the front side of the urea water tank 91 to Both temperatures of the urea mixing pipe 73 can be easily managed, and the urea water tank 91 and the urea mixing pipe 73 can be kept warm.
  • the exhaust gas in the first case 62 is moved from the front part of the diesel engine 5 where the cooling fan 40 is arranged toward the rear part of the diesel engine 5 where the flywheel housing 38 is arranged.
  • a urea mixing pipe 73 is extended between the rear part of the diesel engine 5 and the front part of the urea water tank 91 in a direction crossing the exhaust gas movement direction of the first case 62. Therefore, the urea mixing pipe 73 can be arranged compactly between the rear part of the diesel engine 5 and the front part of the urea water tank 91, and the urea mixing pipe 73 is heated by the heat generated on the diesel engine 5 side.
  • the temperature of the urea aqueous solution in the urea mixing tube 73 can be easily maintained, and the crystallization of the urea water in the urea mixing tube 73 can be reduced. That is, the urea mixing pipe 73 is heated by the heat generated on the diesel engine 5 or the first case 62 side, and the crystallization of the urea water in the urea mixing pipe 73 can be reduced, and the urea water is mixed with the exhaust gas as ammonia.
  • the length of the heating portion of the urea mixing pipe 73 that is heated by the heat generated by the diesel engine 5 can be made longer than the length necessary to do so, and the nitrogen oxides in the exhaust gas in the second case 63 It is possible to improve the exhaust gas hatching function for removing the gas.
  • the DPF inlet pipe 68 is located on the front side of the diesel engine 5, the exhaust gas flows from the front part to the rear part of the first case 62, and the diesel engine 5 rear part. The exhaust gas moves to the urea mixing tube 73.
  • the DPF inlet pipe 68 is located on the rear side of the diesel engine 5, and the exhaust gas flows from the rear part to the front part of the first case 62.
  • the exhaust gas is configured to move to a urea mixing pipe 73 provided in the upper part of the diesel engine 5 in parallel with the first case 62. That is, the urea mixing pipe 73 is extended and supported on the upper surface side of the diesel engine 5 in parallel with the first case 62 via the pipe bracket 76.
  • the urea mixing pipe 73 is extended in parallel with the first case 62 extended in the front-rear direction on the upper surface side of the diesel engine 5, and urea disposed at a position higher than the cooling fan 24.
  • a urea water injection nozzle 97 is attached to the front portion of the mixing pipe 73 via an injection pedestal 98, and a urea aqueous solution is sprayed from the urea water injection nozzle 97 into the urea mixing pipe 73.
  • the urea water supplied into the urea mixing pipe 73 is The distance mixed as ammonia in exhaust gas can be formed long. Therefore, in the embodiment shown in FIG. 7, the urea water in the urea mixing pipe 73 is appropriately mixed as ammonia in the exhaust gas from the first case 62 to the second case 63. Further, the urea mixing pipe 73 is heated by the heat generation on the diesel engine 5 side, and the temperature of the exhaust gas (urea aqueous solution) in the urea mixing pipe 73 can be suppressed from decreasing, and the urea water in the urea mixing pipe 73 can be suppressed. Crystallization can be reduced.
  • a urea water tank 91 for purifying exhaust gas and a urea mixing pipe 73 for supplying urea water from the urea water tank 91 are provided, and the first case 62 is connected to the exhaust outlet via the urea mixing pipe 73.
  • the exhaust gas inlet of the two cases 63 is connected, and the first case 62 is supported on the upper part of the diesel engine 5, and the urea mixing pipe 73 is extended in parallel with the exhaust gas movement direction of the first case 62.
  • the urea mixing pipe 73 is heated by the heat generated on the diesel engine 5 or the first case 62 side, and the crystallization of the urea water in the urea mixing pipe 73 can be reduced, and the urea water is mixed with the exhaust gas as ammonia.
  • the length of the heating portion of the urea mixing pipe 73 that is heated by the heat generated by the diesel engine 5 can be made longer than the length necessary to do so, and the nitrogen oxides in the exhaust gas in the second case 63 It is possible to improve the exhaust gas hatching function for removing the gas.
  • an operation cabin 7 as an operation unit on which an operator is boarded, a first case 62 that removes particulate matter in exhaust gas from the diesel engine 5, and exhaust gas from the diesel engine 5.
  • An operation including a second case 63 for removing nitrogen oxides in the gas, a urea mixing pipe 73 for connecting the second case 63 to the first case 62, and a urea water tank 91 for supplying urea water to the urea mixing pipe 73.
  • the vehicle has a structure in which the diesel engine 5 is arranged in the traveling machine body 2 in front of the driving cabin 7, and a tank support 90 is provided between the rear part of the diesel engine 5 and the front part of the driving cabin 7.
  • a urea water tank 91 is attached via a tank mount 90 as a support. Therefore, the urea water tank 91 can be kept warm using the exhaust heat of the diesel engine 5 and the like, and the urea crystal lump can be prevented from being generated, and the urea water tank 91 is provided on the upper surface side of the highly rigid traveling machine body 2. The support rigidity of the urea water tank 91 can be easily improved.
  • the urea water tank 91 is disposed so that the front side of the front column 10 of the operation cabin 7 (operation unit) can be closed, and the rear of the engine room inside the hood 6 where the diesel engine 5 is disposed. Since the urea water tank 91 is configured as a partition member at the front part of the operating cabin 7, the urea water tank 91 can be satisfactorily kept warm by utilizing exhaust heat of the diesel engine 5. Thermal insulation or soundproofing can be improved more easily than the plate.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Transportation (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

L'invention a pour objectif de fournir un véhicule de travail qui tout en permettant de maintenir de manière satisfaisante la température d'un réservoir d'eau d'urée (91) à l'aide de la chaleur résiduelle d'un moteur (5), ou similaire, permet d'améliorer simplement la rigidité de support, ou similaire, du réservoir d'eau d'urée (91). Ce véhicule de travail est équipé : d'une partie conduite (7) dans laquelle un opérateur monte ; d'une première enveloppe (62) destinée à éliminer une matière particulaire contenue dans le gaz d'échappement du moteur (5) ; d'une seconde enveloppe (63) destinée à éliminer une matière d'oxyde d'azote contenue dans le gaz d'échappement du moteur (5) ; d'un tube pour mélange d'urée (73) connectant la seconde enveloppe (63) à la première enveloppe (62) ; et du réservoir d'eau d'urée (91) qui alimente en eau d'urée le tube pour mélange d'urée (73). La structure du véhicule de travail dans laquelle le moteur (5) est disposé dans un corps de machine de déplacement (2) à l'avant de la partie conduite (7), est telle qu'un corps de support de réservoir (90) est agencé entre la partie arrière du moteur (5) et la partie avant de la partie conduite (7), et qu'un réservoir d'eau d'urée (91) est installé sur le corps de machine de déplacement (2) par l'intermédiaire du corps de support de réservoir (90).
PCT/JP2014/068905 2013-07-23 2014-07-16 Véhicule de travail WO2015012168A1 (fr)

Applications Claiming Priority (2)

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JP2013-152848 2013-07-23

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JP7143365B2 (ja) * 2020-05-20 2022-09-28 ヤンマーパワーテクノロジー株式会社 トラクタ

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JP2012219624A (ja) * 2011-04-04 2012-11-12 Hitachi Constr Mach Co Ltd 建設機械
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WO2019081475A1 (fr) * 2017-10-25 2019-05-02 Man Truck & Bus Ag Véhicule, en particulier véhicule tout-terrain, comprenant un dispositif de post-traitement de gaz d'échappement
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EP4386186A1 (fr) * 2019-03-22 2024-06-19 Yanmar Power Technology Co., Ltd. Moteur

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JP6157966B2 (ja) 2017-07-05

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