WO2016043346A1 - 作業車両 - Google Patents
作業車両 Download PDFInfo
- Publication number
- WO2016043346A1 WO2016043346A1 PCT/JP2015/077924 JP2015077924W WO2016043346A1 WO 2016043346 A1 WO2016043346 A1 WO 2016043346A1 JP 2015077924 W JP2015077924 W JP 2015077924W WO 2016043346 A1 WO2016043346 A1 WO 2016043346A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reducing agent
- circuit
- injection device
- engine
- agent injection
- Prior art date
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
- E02F9/0866—Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment
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- 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
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
- E02F9/0883—Tanks, e.g. oil tank, urea tank, fuel tank
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/16—Cabins, platforms, or the like, for drivers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
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- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2200/00—Type of vehicle
- B60Y2200/40—Special vehicles
- B60Y2200/41—Construction vehicles, e.g. graders, excavators
- B60Y2200/415—Wheel loaders
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
- E02F3/3417—Buckets emptying by tilting
Definitions
- a work vehicle including a heat exchange medium circulation circuit for cooling / heating internal equipment.
- Patent Document 1 discloses a vehicle including a circuit (heat exchange medium circulation circuit) for circulating a heat exchange medium such as cooling water. Specifically, a reducing agent injection device cooling circuit and a reducing agent tank anti-freezing circuit, which are arranged in parallel to communicate with the engine cooling circuit, are disclosed.
- the work vehicle is also provided with a heating circuit for heating the cab.
- this heating circuit is provided in parallel with the above circuit, so that the heating performance of the heating circuit, the cooling performance of the reducing agent injection device cooling circuit, and the reducing agent are increased. It has been difficult to ensure sufficient heating performance of the tank freeze prevention circuit.
- This specification discloses a work vehicle capable of ensuring the heating performance of the heating circuit, the cooling performance of the reducing agent injection device cooling circuit, and the heating performance of the reducing agent tank freeze prevention circuit.
- a work vehicle includes an engine, an exhaust processing device that processes exhaust of the engine, a reducing agent injection device that injects a reducing agent into the exhaust processing device, a reducing agent tank that stores the reducing agent, and driving A room, an engine cooling circuit, a reducing agent injection device cooling circuit, a reducing agent tank freeze prevention circuit, and a heating circuit of the cab.
- the reducing agent injection device cooling circuit, the reducing agent tank freezing prevention circuit, and the heating circuit are arranged in communication with the engine cooling circuit.
- One of the reducing agent injection device cooling circuit, the reducing agent tank freeze prevention circuit, and the heating circuit is arranged in series with respect to the remaining circuits.
- the reducing agent injection device cooling circuit may be arranged in series with the reducing agent tank freeze prevention circuit and the heating circuit arranged in parallel.
- the reducing agent tank freeze prevention circuit may include a throttle provided near the inlet of the reducing agent tank.
- the work vehicle may further include a bypass circuit arranged in parallel with the reducing agent injection device cooling circuit.
- the bypass circuit may include a diaphragm.
- the reducing agent injection device cooling circuit may be arranged closer to the engine cooling circuit than the reducing agent tank freeze prevention circuit and the heating circuit arranged in parallel.
- the reducing agent injection device cooling circuit may be connected to the engine cooling circuit in the engine cylinder block.
- one of the reducing agent injection device cooling circuit, the reducing agent tank freeze prevention circuit, and the heating circuit is arranged in series with respect to the remaining circuits. Therefore, the required amount of the heat exchange medium is reduced as compared with the case where the reducing agent injection device cooling circuit, the reducing agent tank freezing prevention circuit, and the heating circuit are arranged in parallel. Therefore, the heating performance of the heating circuit, the cooling performance of the reducing agent injection device cooling circuit, and the heating performance of the reducing agent tank freeze prevention circuit can be sufficiently ensured.
- FIG. 1 is a side view of both workers according to the embodiment.
- FIG. 2 is a side view showing the internal configuration of the engine compartment.
- FIG. 3 is a functional diagram schematically illustrating a path of a medium for heat exchange of the work vehicle according to the first embodiment.
- FIG. 4 is a functional diagram schematically showing a path of a medium for heat exchange of the work vehicle according to the second embodiment.
- FIG. 1 is a side view of a work vehicle 1 according to the embodiment.
- the work vehicle 1 is a wheel loader.
- the work vehicle 1 includes a body frame 2, a work implement 3, traveling wheels 4 and 5, and a cab 6.
- the work vehicle 1 travels when the traveling wheels 4 and 5 are rotationally driven.
- the work vehicle 1 can perform work such as excavation using the work machine 3.
- the working machine 3 is attached to the body frame 2.
- the work machine 3 is driven by hydraulic oil from a hydraulic pump (not shown).
- the work machine 3 includes a boom 11 and a bucket 12.
- the boom 11 is attached to the vehicle body frame 2.
- the work machine 3 includes a lift cylinder 13 and a bucket cylinder 14.
- the lift cylinder 13 and the bucket cylinder 14 are hydraulic cylinders.
- One end of the lift cylinder 13 is attached to the vehicle body frame 2.
- the other end of the lift cylinder 13 is attached to the boom 11.
- the boom 11 swings up and down as the lift cylinder 13 expands and contracts with hydraulic oil from the hydraulic pump.
- the bucket 12 is attached to the tip of the boom 11.
- One end of the bucket cylinder 14 is attached to the vehicle body frame 2.
- the other end of the bucket cylinder 14 is attached to a tilt arm 18.
- the bucket cylinder 14 drives the bucket 12 via a tilt arm 18 and a tilt rod (not shown).
- the bucket 12 swings up and down as the bucket cylinder
- the cab 6 and traveling wheels 4 and 5 are attached to the body frame 2.
- the cab 6 is disposed on the vehicle body frame 2.
- a seat on which an operator is seated, a heating device 80 (see FIG. 3 and the like) described later, and the like are arranged.
- the vehicle body frame 2 has a front frame 2a and a rear frame 2b.
- the front frame 2a and the rear frame 2b are attached so as to be swingable in the left-right direction.
- the front, rear, left, and right directions mean the front, rear, left, and right directions as viewed from the operator in the cab 6.
- the work machine 3 is attached to the front frame 2a.
- a cab 6, an engine compartment 7, and a reducing agent tank 17 are disposed in the rear frame 2b.
- the engine compartment 7 is disposed behind the cab 6.
- the reducing agent tank 17 is disposed on the side of the cab 6 (left side in the example of FIG. 1) and in front of the engine compartment 7.
- the reducing agent tank 17 stores the reducing agent injected by the reducing agent injection device 54 described later.
- Work vehicle 1 has a steering cylinder 15.
- the steering cylinder 15 is attached to the front frame 2a and the rear frame 2b.
- the steering cylinder 15 is a hydraulic cylinder. As the steering cylinder 15 expands and contracts, the traveling direction of the work vehicle 1 is changed to the left and right.
- FIG. 2 is a side view showing the internal structure of the engine compartment 7. As shown in FIG. 2, an engine 21, a cooling device 22, a first exhaust treatment device 23, and a second exhaust treatment device 24 are arranged in the engine chamber 7.
- the engine 21 drives the traveling wheels 4 and 5 and the hydraulic pump described above.
- the engine 21 is supported by the rear frame 2b.
- the cooling device 22 includes a radiator 26 and a fan 27.
- the radiator 26 cools the cooling water of the engine 21.
- the fan 27 generates an air flow that passes through the radiator 26 and flows to the rear of the radiator 26.
- the air that has passed through the radiator 26 is discharged rearward from a discharge port 29 on the rear surface of the engine compartment 7.
- the first exhaust treatment device 23 is disposed above the engine 21.
- the first exhaust processing device 23 processes the exhaust of the engine 21.
- the first exhaust treatment device 23 is, for example, a diesel oxidation catalyst (DOC) device.
- DOC diesel oxidation catalyst
- the first exhaust treatment device 23 has a substantially cylindrical shape.
- the first exhaust treatment device 23 is disposed such that the central axis of the first exhaust treatment device 23 extends in the vehicle width direction.
- the first exhaust treatment device 23 is arranged so that the longitudinal direction of the first exhaust treatment device 23 is along the vehicle width direction.
- the first exhaust treatment device 23 is connected to the engine 21 via the first connection pipe 41.
- the second exhaust treatment device 24 is disposed in front of the first exhaust treatment device 23 above the engine 21.
- the second exhaust processing device 24 processes the exhaust of the engine 21.
- the second exhaust treatment device 24 is, for example, a selective reduction catalyst (SCR) device.
- SCR selective reduction catalyst
- the second exhaust treatment device 24 has a substantially cylindrical shape.
- the second exhaust treatment device 24 is disposed such that the central axis of the second exhaust treatment device 24 extends in the vehicle width direction.
- the second exhaust treatment device 24 is arranged so that the longitudinal direction of the second exhaust treatment device 24 is along the vehicle width direction.
- the second exhaust treatment device 24 is connected to the first exhaust treatment device 23 via the second connection pipe 42.
- the second connection pipe 42 is disposed above the first exhaust treatment device 23 and the second exhaust treatment device 24.
- the longitudinal direction of the second connection pipe 42 is arranged along the vehicle width direction.
- a reducing agent injection device 54 is attached to the second connection pipe 42.
- the reducing agent injection device 54 injects the reducing agent stored in the reducing agent tank 17 into the second connection pipe 42.
- the reducing agent is, for example, urea water.
- the second connection pipe 42 is an exhaust treatment device that treats exhaust from the engine 21 by mixing a reducing agent with exhaust from the engine 21.
- An exhaust pipe 47 is connected to the second exhaust treatment device 24.
- the exhaust pipe 47 is located above the second exhaust treatment device 24.
- the exhaust pipe 47 extends in the vehicle width direction above the second exhaust treatment device 24 and is bent upward. As shown in FIG. 1, the tip of the exhaust pipe 47 protrudes upward from the upper surface of the engine compartment 7. The tip of the exhaust pipe 47 is bent toward the rear.
- the first exhaust treatment device 23, the second exhaust treatment device 24, and the second connection pipe 42 may not be arranged in parallel to each other. Further, the longitudinal directions of the first exhaust treatment device 23, the second exhaust treatment device 24, and the second connection pipe 42 may not extend in the vehicle width direction. For example, each longitudinal direction may extend in the front-rear direction. Alternatively, each longitudinal direction may be inclined with respect to the vehicle width direction.
- the second connection pipe 42 may not be located above the first exhaust treatment device 23 and the second exhaust treatment device 24.
- the central axes of the first exhaust treatment device 23, the second exhaust treatment device 24, and the second connection pipe 42 may be arranged side by side in the horizontal direction.
- FIG. 3 is a functional diagram schematically showing a path of a medium for heat exchange of the work vehicle according to the first embodiment. Based on FIG. 3, the main flow path of the medium for heat exchange (heat exchange medium) related to the present embodiment will be described.
- the heat exchange medium the cooling water of the engine 21 is used.
- the work vehicle 1 mainly includes a pump 61, a first pipe 71, a second pipe 72, a reducing agent injection device cooling circuit 73, a bypass circuit 74, a third pipe 75, a heating circuit 76, a reducing agent tank freezing prevention circuit 77, A return pipe 78 is provided.
- the first pipe 71 connects the water jacket of the cylinder block 21a of the engine 21 and the radiator 26, and sends the cooling water cooled by the radiator 26 to the water jacket of the cylinder block 21a.
- a pump 61 is connected in the middle of the first pipe 71. The pump 61 is driven by obtaining power from the engine 21, and supplies cooling water to the engine 21 via the first pipe 71.
- the engine 21 includes an engine cooling circuit 21c having a water jacket for the cylinder block 21a and a water jacket for the cylinder head 21b.
- a part of the cooling water flowing into the water jacket of the cylinder head 21 b is sent to the thermostat 63.
- the thermostat 63 sends the cooling water sent to the thermostat 63 to the radiator 26.
- the thermostat 63 blocks the cooling water flow path from the cylinder head 21b to the radiator 26.
- Another part of the cooling water that has flowed into the water jacket of the cylinder head 21 b is sent to the second pipe 72. That is, the second pipe 72 is connected to the cylinder head 21b.
- the second pipe 72 is connected to the reducing agent injection device cooling circuit 73 and the bypass circuit 74 at the branch point P. That is, the reducing agent injection device cooling circuit 73 and the bypass circuit 74 communicate with the engine cooling circuit 21c.
- the cooling water flowing into the reducing agent injection device cooling circuit 73 from the second pipe 72 is supplied to the reducing agent injection device 54. Thereby, the reducing agent injection device 54 is cooled. Therefore, the temperature inside the reducing agent injection device 54 can be set within an appropriate temperature range.
- the bypass circuit 74 is arranged in parallel with the reducing agent injection device cooling circuit 73.
- the bypass circuit 74 includes a diaphragm 91.
- the throttle 91 adjusts the flow rate of the cooling water flowing to the reducing agent injection device cooling circuit 73 and the flow rate of the cooling water flowing to the bypass circuit 74.
- the flow rate of the cooling water in the reducing agent injection device cooling circuit 73 is adjusted by the diameter of the throttle 91.
- the reducing agent injection device cooling circuit 73 and the bypass circuit 74 are connected to the third pipe 75 at the branch point Q.
- the cooling water flowing out from the reducing agent injection device cooling circuit 73 and the cooling water flowing out from the bypass circuit 74 are sent to the third pipe 75.
- the third pipe 75 is connected to the heating circuit 76 and the reducing agent tank freeze prevention circuit 77 at the branch point R. That is, the heating circuit 76 and the reducing agent tank freezing prevention circuit 77 communicate with the engine cooling circuit 21c.
- the heating circuit 76 and the reducing agent tank freezing prevention circuit 77 are arranged in parallel.
- the reducing agent injection device cooling circuit 73 is arranged in series with the heating circuit 76 and the reducing agent tank freezing prevention circuit 77 arranged in parallel.
- the reducing agent injection device cooling circuit 73 is disposed closer to the engine cooling circuit 21c than the heating circuit 76 and the reducing agent tank freeze prevention circuit 77 disposed in parallel.
- the reducing agent injection device cooling circuit 73 is located upstream of the heating circuit 76 and the reducing agent tank freeze prevention circuit 77 arranged in parallel and downstream of the engine cooling circuit 21c as viewed from the direction in which the cooling water flows. To position.
- the cooling water passing through the third pipe 75 is warmed by the engine 21 and the reducing agent injection device 54.
- the cooling water passing through the third pipe 75 functions as a heat exchange medium that supplies heat to the heating circuit 76 and the reducing agent tank freeze prevention circuit 77.
- the heat exchange medium flowing through the heating circuit 76 is sent to the heating device 80 inside the cab 6.
- Heating device 80 includes a heater core 82 and a fan 84.
- the heater core 82 exchanges heat between the heat exchange medium flowing through the heating circuit 76 and the air.
- the fan 84 blows air warmed by the heater core 82 into the cab 6.
- the heat exchange medium passing through the heater core 82 is sent to the branch point S.
- the heat exchange medium flowing through the reducing agent tank freezing prevention circuit 77 is sent to the heat exchanger 65 inside the reducing agent tank 17.
- the heat exchanger 65 exchanges heat between the heat exchange medium flowing through the reducing agent tank freeze prevention circuit 77 and the reducing agent.
- the reducing agent tank freeze prevention circuit 77 includes a throttle 92 provided in the vicinity of the inlet of the reducing agent tank 17.
- the restriction 92 adjusts the flow rate of the heat exchange medium flowing to the heating device 80 and the flow rate of the heat exchange medium flowing to the heat exchanger 65. That is, the diameter of the throttle 92 is set such that an appropriate amount of heat exchange medium is supplied to the heating device 80 and the heat exchanger 65.
- the heat exchange medium that has passed through the heat exchanger 65 is sent to the branch point S.
- the return pipe 78 is connected to the heating circuit 76 and the reducing agent tank freezing prevention circuit 77 at the branch point S.
- the heat exchange medium flowing out from the heating circuit 76 and the heat exchange medium flowing out from the reducing agent tank freeze prevention circuit 77 are sent to the return pipe 78.
- the heat exchange medium passing through the return pipe 78 is sent to the first pipe 71 via the branch point T.
- FIG. 4 is a functional diagram schematically showing the route of the heat exchange medium of the work vehicle according to the second embodiment.
- the path of the heat exchange medium of the second embodiment is the same for most configurations as the path of the heat exchange medium of the first embodiment. Therefore, in FIG. 4, the same reference numerals are given to the same components as those shown in FIG. 3, and the description of these components is omitted.
- the route of the heat exchange medium of the work vehicle according to the second embodiment will be described focusing on differences from the route of the first embodiment.
- the second pipe 72a connected to the cylinder head 21b extends to the second branch point Q without being connected to the reducing agent injection device 54.
- the 2nd piping 72a does not need to contain an aperture_diaphragm
- the reducing agent injection device cooling circuit 73 a is connected to the engine cooling circuit 21 c in the cylinder block 21 a of the engine 21.
- a part of the cooling water flowing into the water jacket of the cylinder block 21a is sent to the reducing agent injection device cooling circuit 73a. Cooling water flowing from the water jacket of the cylinder block 21 a into the reducing agent injection device cooling circuit 73 a is supplied to the reducing agent injection device 54.
- the inner diameter of the piping of the reducing agent injection device cooling circuit 73 a may be set so that an appropriate amount of cooling water is supplied to the reducing agent injection device 54.
- the reducing agent injection device cooling circuit 73a and the second pipe 72a are connected to the third pipe 75 at the branch point Q.
- the reducing agent injection device cooling circuit 73a is arranged in series with the heating circuit 76 and the reducing agent tank freeze prevention circuit 77 arranged in parallel.
- the reducing agent injection device cooling circuit 73a is arranged closer to the engine cooling circuit 21c than the heating circuit 76 and the reducing agent tank freeze prevention circuit 77 arranged in parallel.
- one of the reducing agent injection device cooling circuits 73 and 73 a, the reducing agent tank freeze prevention circuit 77, and the heating circuit 76 is left. Arranged in series with the circuit. Therefore, the required amount of the heat exchange medium is reduced as compared with the case where the reducing agent injection device cooling circuits 73 and 73a, the reducing agent tank freeze prevention circuit 77, and the heating circuit 76 are arranged in parallel. Therefore, the heating performance of the heating circuit 76, the cooling performance of the reducing agent injection device cooling circuits 73 and 73a, and the heating performance of the reducing agent tank freezing prevention circuit 77 can be sufficiently ensured.
- a reducing agent tank freezing prevention circuit 77 and a heating circuit 76 are arranged in parallel.
- the reducing agent injection device cooling circuits 73 and 73a are arranged in series with respect to the heating circuit 76 and the reducing agent tank freezing prevention circuit 77 arranged in parallel.
- the reducing agent tank freezing prevention circuit 77 and the heating circuit 76 take heat from the heat exchange medium (cooling water), and the reducing agent injection device cooling circuits 73 and 73a supply heat to the heat exchange medium. Therefore, it is possible to realize a heat exchange medium path with high thermal efficiency.
- the reducing agent injection device cooling circuits 73 and 73a are arranged closer to the engine cooling circuit 21c than the reducing agent tank freeze prevention circuit 77 and the heating circuit 76 arranged in parallel.
- the heat exchange medium (cooling water) warmed by the engine cooling circuit 21 c and the reducing agent injection device cooling circuits 73 and 73 a is supplied to the reducing agent tank freeze prevention circuit 77 and the heating circuit 76. Therefore, the heating performance of the cab 6 and the antifreezing performance of the reducing agent tank 17 are improved.
- the reducing agent tank freeze prevention circuit 77 includes a throttle 92 provided in the vicinity of the inlet of the reducing agent tank 17.
- the diameter of the throttle 92 is set so that an appropriate amount of heat exchange medium is supplied to the heating device 80 and the heat exchanger 65. This makes it possible to determine the temperature of the reducing agent within an appropriate temperature range so as to prevent freezing of the reducing agent while ensuring the heating performance of the heating device 80.
- a bypass circuit 74 arranged in parallel to the reducing agent injection device cooling circuit 73 is provided. As a result, a large amount of cooling water flows into the reducing agent injection device cooling circuit 73, and the reducing agent injection device 54 is prevented from being overcooled.
- the bypass circuit 74 includes a diaphragm 91.
- the flow rate of the cooling water in the reducing agent injection device cooling circuit 73 is adjusted by the diameter of the throttle 91. Accordingly, the reducing agent injection device 54 can set the temperature of the reducing agent within an appropriate temperature range.
- the reducing agent injection device cooling circuit 73a is connected to the engine cooling circuit 21c in the cylinder block 21a of the engine 21. Thereby, the cooling water which is not heated greatly by the engine cooling circuit 21c is supplied to the reducing agent injection device cooling circuit 73a. Therefore, the cooling performance of the reducing agent injection device 54 is improved.
- a wheel loader is illustrated as the work vehicle 1, but other work vehicles such as a hydraulic excavator or a bulldozer may be used.
- DOC is exemplified as the first exhaust treatment device 23 and SCR is exemplified as the second exhaust treatment device 24.
- DOC diesel particulate filter
- DPF diesel particulate filter
- the above embodiment shows an example in which the reducing agent injection device cooling circuits 73 and 73a are arranged in series with the reducing agent tank freeze prevention circuit 77 and the heating circuit 76 arranged in parallel.
- any two of the reducing agent injection device cooling circuits 73 and 73a, the reducing agent tank freeze prevention circuit 77, and the heating circuit 76 are arranged in parallel, and the remaining one circuit is arranged in parallel.
- they may be arranged in series.
- the above embodiment shows an example in which the reducing agent injection device cooling circuits 73 and 73a are arranged closer to the engine cooling circuit 21c than the reducing agent tank freeze prevention circuit 77 and the heating circuit 76 arranged in parallel.
- the reducing agent tank freezing prevention circuit 77 and the heating circuit 76 arranged in parallel may be arranged closer to the engine cooling circuit 21c than the reducing agent injection device cooling circuits 73 and 73a.
- the second pipe 72a may be provided with a throttle so that an appropriate amount of cooling water is supplied to the reducing agent injection device 54 by the throttle.
- the arrangement of the radiator 26, the pump 61, and the thermostat 63 is not limited to the example shown in FIGS. 3 and 4, and may be arranged on another route.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Transportation (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Exhaust Gas After Treatment (AREA)
- Component Parts Of Construction Machinery (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
本実施形態の作業車両1では、図3、4に示すように、還元剤噴射装置冷却回路73、73a、還元剤タンク凍結防止回路77、及び、暖房回路76のうちの1つの回路が残りの回路に対して直列に配置される。したがって、還元剤噴射装置冷却回路73、73a、還元剤タンク凍結防止回路77、及び、暖房回路76を並列に配置する場合に比べて、熱交換媒体の必要量が少なくなる。したがって、暖房回路76の暖房性能と還元剤噴射装置冷却回路73、73aの冷却性能と還元剤タンク凍結防止回路77の加熱性能とを十分に確保することができる。
Claims (7)
- エンジンと、
前記エンジンの排気を処理する排気処理装置と、
前記排気処理装置に還元剤を噴射する還元剤噴射装置と、
前記還元剤を貯留する還元剤タンクと、
運転室と、
エンジン冷却回路と、
還元剤噴射装置冷却回路と、
還元剤タンク凍結防止回路と、
前記運転室の暖房回路と、
を備え、
前記還元剤噴射装置冷却回路、前記還元剤タンク凍結防止回路、及び前記暖房回路は、前記エンジン冷却回路に連通して配置され、
前記還元剤噴射装置冷却回路、前記還元剤タンク凍結防止回路、及び、前記暖房回路のうちの1つの回路が残りの回路に対して直列に配置される、
作業車両。
- 前記還元剤タンク凍結防止回路と、前記暖房回路とが並列に配置され、
前記還元剤噴射装置冷却回路は、並列に配置された前記還元剤タンク凍結防止回路及び前記暖房回路に対して直列に配置される、
請求項1に記載の作業車両。
- 前記還元剤タンク凍結防止回路は、前記還元剤タンクの入口近傍に設けられた絞りを含む、請求項2に記載の作業車両。
- 前記還元剤噴射装置冷却回路に対して並列に配置されたバイパス回路をさらに備える、
請求項2または3に記載の作業車両。
- 前記バイパス回路は、絞りを含む、
請求項4に記載の作業車両。
- 前記還元剤噴射装置冷却回路は、前記並列に配置された前記還元剤タンク凍結防止回路及び前記暖房回路よりも、前記エンジン冷却回路側に配置される、
請求項2から5のいずれかに記載の作業車両。
- 前記還元剤噴射装置冷却回路は、前記エンジンのシリンダブロックにおいて、前記エンジン冷却回路と連結する、
請求項6に記載の作業車両。
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CN201580000999.2A CN105723063A (zh) | 2015-10-01 | 2015-10-01 | 作业车 |
JP2015551928A JP5923223B1 (ja) | 2015-10-01 | 2015-10-01 | 作業車両 |
US14/896,485 US20170096795A1 (en) | 2015-10-01 | 2015-10-01 | Work vehicle |
PCT/JP2015/077924 WO2016043346A1 (ja) | 2015-10-01 | 2015-10-01 | 作業車両 |
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PCT/JP2015/077924 WO2016043346A1 (ja) | 2015-10-01 | 2015-10-01 | 作業車両 |
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WO2016043346A1 true WO2016043346A1 (ja) | 2016-03-24 |
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US (1) | US20170096795A1 (ja) |
JP (1) | JP5923223B1 (ja) |
CN (1) | CN105723063A (ja) |
WO (1) | WO2016043346A1 (ja) |
Cited By (1)
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CN112539106A (zh) * | 2020-12-04 | 2021-03-23 | 北京电子科技职业学院 | 一种新型柴油机冷却系统 |
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US9945099B2 (en) * | 2014-11-21 | 2018-04-17 | Kcm Corporation | Industrial vehicle |
US10941696B2 (en) * | 2018-06-27 | 2021-03-09 | Kubota Corporation | Engine cover and work vehicle |
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EP2192280A1 (en) * | 2008-12-01 | 2010-06-02 | International Engine Intellectual Property LLC | Thermal management of urea dosing components in an engine exhaust after-treatment system |
JP2012237232A (ja) * | 2011-05-11 | 2012-12-06 | Hitachi Constr Mach Co Ltd | 建設機械 |
WO2014141513A1 (ja) * | 2013-03-15 | 2014-09-18 | 株式会社小松製作所 | 排気処理ユニット及び排気処理ユニットを搭載する作業車両 |
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JP5028165B2 (ja) * | 2007-07-03 | 2012-09-19 | 日立建機株式会社 | エンジン動力機械 |
JP6217408B2 (ja) * | 2014-01-24 | 2017-10-25 | コベルコ建機株式会社 | 建設機械の排気処理装置、および建設機械 |
-
2015
- 2015-10-01 US US14/896,485 patent/US20170096795A1/en not_active Abandoned
- 2015-10-01 WO PCT/JP2015/077924 patent/WO2016043346A1/ja active Application Filing
- 2015-10-01 JP JP2015551928A patent/JP5923223B1/ja active Active
- 2015-10-01 CN CN201580000999.2A patent/CN105723063A/zh active Pending
Patent Citations (3)
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EP2192280A1 (en) * | 2008-12-01 | 2010-06-02 | International Engine Intellectual Property LLC | Thermal management of urea dosing components in an engine exhaust after-treatment system |
JP2012237232A (ja) * | 2011-05-11 | 2012-12-06 | Hitachi Constr Mach Co Ltd | 建設機械 |
WO2014141513A1 (ja) * | 2013-03-15 | 2014-09-18 | 株式会社小松製作所 | 排気処理ユニット及び排気処理ユニットを搭載する作業車両 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112539106A (zh) * | 2020-12-04 | 2021-03-23 | 北京电子科技职业学院 | 一种新型柴油机冷却系统 |
CN112539106B (zh) * | 2020-12-04 | 2022-03-18 | 北京电子科技职业学院 | 一种新型柴油机冷却系统 |
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JPWO2016043346A1 (ja) | 2017-04-27 |
JP5923223B1 (ja) | 2016-05-24 |
US20170096795A1 (en) | 2017-04-06 |
CN105723063A (zh) | 2016-06-29 |
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