JP6615668B2 - Asphalt finisher - Google Patents

Description

The present invention relates to an asphalt finisher equipped with an exhaust gas treatment device that purifies exhaust gas using a liquid reducing agent.

  A self-propelled asphalt finisher driven by an engine is known (see Patent Document 1). The engine mounted on this asphalt finisher exhausts exhaust gas containing nitrogen oxides.

JP2015-1335026

  However, Patent Document 1 does not mention a device for purifying exhaust gas and a reducing agent tank that stores a liquid reducing agent consumed in such a device. The tank for the reducing agent has a tank supply port at the top, but depending on the mounting position of the tank for the reducing agent in the asphalt finisher, the tank supply port may be located at the back of the tank. Replenishment may be difficult. In this case, the liquid reducing agent may be spilled during replenishment.

In view of the above, it is desirable to provide an asphalt finisher that facilitates replenishment of a liquid reducing agent to a reducing agent tank.

An asphalt finisher according to an embodiment of the present invention includes a tractor, a hopper installed on the front side of the tractor, a conveyor that conveys the paving material in the hopper to the rear side of the tractor, and a road surface that is conveyed by the conveyor. A screw that spreads pavement material spread on the vehicle in the vehicle width direction, a screed that spreads the pavement material spread by the screw on the rear side of the screw, and an engine disposed in the engine compartment of the tractor; An exhaust gas processing device for purifying the exhaust gas of the engine, a liquid reducing agent tank for storing a liquid reducing agent consumed in the exhaust gas processing device, and a tank supply port of the liquid reducing agent tank a asphalt finisher comprising a filler that is, the, the tank liquid supply port, the asphalt finisher Is arranged at a position to become the shadow of the components of the asphalt finisher as viewed from, the filler liquid supply port of the filler is placed in a position not viewed from the outside of the asphalt finisher in the shadow of the components of the asphalt finisher .

By the means described above, an asphalt finisher that facilitates replenishment of the liquid reducing agent to the reducing agent tank is provided.

It is the side view and top view of an asphalt finisher. It is a hydraulic circuit diagram which shows the structural example of the hydraulic system mounted in the asphalt finisher of FIG. It is a figure which shows the structural example of the exhaust-gas processing system mounted in the asphalt finisher of FIG. It is the front view and side view of a urea water tank, and the figure which looked at the urea water tank accommodated in the outer shell member from diagonally downward. FIG. It is the figure which looked at the lower surface (part in which a urea water tank is mounted) of the asphalt finisher from diagonally below. It is a partial side view of an asphalt finisher showing a portion where a urea water tank is mounted. It is a partial front view of the upper part of the urea water tank which shows the filler attached to the tank liquid supply port. It is a partial side view of an asphalt finisher showing a portion where a urea water tank is mounted. It is the side view and top view of an asphalt finisher.

  FIG. 1 is a diagram of an asphalt finisher 100 that is an example of a road machine (paving machine) according to an embodiment of the present invention. Specifically, FIG. 1A is a left side view, and FIG. 1B is a top view.

  The asphalt finisher 100 mainly includes a tractor 1, a hopper 2, and a screed 3.

  The tractor 1 is a mechanism for running the asphalt finisher 100. In this embodiment, the tractor 1 moves the asphalt finisher 100 by rotating the front wheels 4 and the rear wheels 5 as traveling bodies using a traveling hydraulic motor. The traveling body may be a crawler. The traveling hydraulic motor rotates upon receiving hydraulic oil supplied from a hydraulic pump driven by the engine 6. The tractor 1 is equipped with an engine 6, an exhaust gas processing device 7, a fuel tank 8, a urea water tank 9, a controller 30, a monitor 77, and the like.

  The engine 6 and the exhaust gas treatment device 7 are installed in the engine room. The engine chamber is formed in the + X side (front side) portion of the tractor 1. In the present embodiment, in the engine room, the engine 6 is disposed on the −Y side (left side), and the exhaust gas treatment device 7 is disposed adjacent to the + Y side (right side) of the engine 6.

  The upper surface of the engine chamber is partially covered with an engine hood 1a indicated by hatching, and the side surface is covered with an exterior cover 1b. The engine 6 and the exhaust gas treatment device 7 are disposed in the engine hood 1a. The engine hood 1a is configured to be openable and closable, and a ventilation hole is formed on the surface thereof. The exterior cover 1b is configured not to be openable or closable, and has a vent hole formed on the surface thereof. In the present embodiment, a part of the engine hood 1a is made of punching metal, and another part has a ventilation louver. The exterior cover 1b has a ventilation louver.

  The fuel tank 8 and the urea water tank 9 are installed in the tank chamber. The tank chamber is formed on the + X side (front side) of the tractor 1 and on the −Z side (lower side) of the engine chamber. In this embodiment, in the tank chamber, the fuel tank 8 and the urea water tank 9 are arranged on the −Y side (left side), and the urea water tank 9 is arranged adjacent to the −X side (rear side) of the fuel tank 8. The Therefore, the urea water tank 9 is disposed between the rear wheel 5 and the fuel tank 8 in a top view.

  The hopper 2 is a mechanism for receiving a paving material. In this embodiment, the hopper cylinder 2a is configured to be opened and closed in the Y-axis direction (vehicle width direction). The asphalt finisher 100 normally receives the pavement material (for example, asphalt mixture) from the loading platform of the dump truck as the pavement material transport vehicle with the hopper 2 fully opened. The paving material received in the hopper 2 is fed to the screed 3 using the conveyor 10 and the screw 11.

  The conveyor 10 conveys the paving material in the hopper 2 to the −X side (rear side) of the tractor 1. The screw 11 spreads the pavement material conveyed by the conveyor 10 and wound on the road surface in the Y-axis direction (vehicle width direction).

  The screed 3 is a mechanism for spreading and leveling the paving material. In this embodiment, the screed 3 is a floating screed pulled by the tractor 1 and is connected to the tractor 1 via the leveling arm 3a. The leveling arm 3a is moved up and down by the leveling cylinder 3b.

  The leveling cylinder 3b is a hydraulic actuator that moves the leveling arm 3a up and down to adjust the asphalt construction thickness. In the present embodiment, the leveling cylinder 3b has a cylinder connected to the tractor 1 and a rod connected to a pivoting portion of the leveling arm 3a with the tractor 1. Further, when increasing the construction thickness, the controller 30 causes the hydraulic oil discharged from the hydraulic source to flow into the rod-side oil chamber of the leveling cylinder 3b, and contracts the leveling cylinder 3b to raise the leveling arm 3a. On the other hand, when reducing the construction thickness, the controller 30 causes the hydraulic oil in the rod side oil chamber of the leveling cylinder 3b to flow out, extends the leveling cylinder 3b, and lowers the leveling arm 3a.

  The controller 30 is a control device that controls the asphalt finisher 100. In this embodiment, the controller 30 is composed of an arithmetic processing unit including a CPU and an internal memory. Various functions of the controller 30 are realized by the CPU executing a program stored in the internal memory.

  Next, the hydraulic system mounted on the asphalt finisher 100 of FIG. 1 will be described with reference to FIG. FIG. 2 is a hydraulic circuit diagram showing a configuration example of a hydraulic system mounted on the asphalt finisher 100 of FIG.

  The hydraulic system mainly includes a hydraulic pressure source 14, a rear wheel drive unit F1, and a conveyor / screw drive unit F2.

  The hydraulic pressure source 14 is a functional element that supplies hydraulic oil that operates various hydraulic drive units including the rear wheel drive unit F1 and the conveyor / screw drive unit F2. In this embodiment, the hydraulic power source 14 mainly includes the engine 6, a rear wheel traveling pump 14R, a charge pump 14C, a cylinder pump 14M, and a conveyor / screw pump 14S.

  The engine 6 is a drive source that drives the rear wheel pump 14R, the charge pump 14C, the cylinder pump 14M, and the conveyor / screw pump 14S.

  The rear wheel traveling pump 14R is a variable displacement hydraulic pump that supplies driving hydraulic oil to the rear wheel driving unit F1. In this embodiment, the rear wheel traveling pump 14R is a swash plate type variable displacement bidirectional hydraulic pump used in a closed circuit (HST), and its discharge amount is controlled by the pump regulator 15. Strictly speaking, the discharge amount is a discharge amount per one rotation of the pump, and is also referred to as a displacement volume. The rear wheel traveling pump 14R may be a fixed displacement hydraulic pump.

  The pump regulator 15 is a device that controls the discharge amount of the rear wheel traveling pump 14R. In this embodiment, the pump regulator 15 adjusts the discharge amount of the rear wheel traveling pump 14 </ b> R according to the pump command current from the controller 30. For example, the larger the current value of the pump command current, the larger the discharge amount of the rear wheel traveling pump 14R.

  The charge pump 14C is a fixed displacement hydraulic pump that supplies control oil to the rear wheel drive unit F1.

  The conveyor / screw pump 14S is a variable displacement hydraulic pump that supplies hydraulic oil to the conveyor / screw driving unit F2. In this embodiment, the conveyor screw pump 14S is a swash plate type variable displacement hydraulic pump. In this embodiment, the discharge amount of the conveyor screw pump 14S is controlled by the pump regulator 15A. The pump regulator 15 </ b> A adjusts the discharge amount of the conveyor screw pump 14 </ b> S according to the pump command current from the controller 30. For example, the larger the current value of the pump command current, the larger the discharge amount of the conveyor screw pump 14S. The conveyor screw pump 14S may be a fixed displacement hydraulic pump.

  The cylinder pump 14M is a variable displacement hydraulic pump that supplies hydraulic oil to hydraulic actuators such as the hopper cylinder 2a and the leveling cylinder 3b. In the present embodiment, the cylinder pump 14M is a swash plate type variable displacement hydraulic pump, and its discharge amount is controlled so that the discharge pressure becomes constant at a predetermined pressure. The pump regulator 15B adjusts the discharge amount of the cylinder pump 14M according to the pump command current from the controller 30. For example, the larger the current value of the pump command current, the larger the discharge amount of the cylinder pump 14M. The cylinder pump 14M may be a fixed displacement hydraulic pump.

  The rear wheel drive unit F1 is a functional element that drives the rear wheels 5L and 5R. In the present embodiment, the rear wheel drive unit F1 includes a left rear wheel traveling motor 20L, a right rear wheel traveling motor 20R, check valves 20La and 20Ra, relief valves 20Lb and 20Rb, reduction ratio control devices 21L and 21R, and a brake. Control devices 22L and 22R are included.

  The left rear wheel travel motor 20L is a hydraulic motor that drives the left rear wheel 5L. The right rear wheel traveling motor 20R is a hydraulic motor that drives the right rear wheel 5R. In this embodiment, the left rear wheel traveling motor 20L and the right rear wheel traveling motor 20R are variable displacement hydraulic motors, and form a closed circuit (HST) together with the rear wheel traveling pump 14R. The left rear wheel traveling motor 20L and the right rear wheel traveling motor 20R may be fixed displacement hydraulic motors.

  The check valve 20La determines the pressure of the hydraulic oil in the pipe C1 that connects the first port of the rear wheel traveling pump 14R and the second ports of the left rear wheel traveling motor 20L and the right rear wheel traveling motor 20R. Maintain above predetermined pressure. Specifically, the check valve 20La causes the hydraulic oil discharged from the charge pump 14C to flow into the pipe line C1 when the pressure of the hydraulic oil in the pipe line C1 falls below the discharge pressure of the charge pump 14C. The numbers in parentheses in the figure represent port numbers. Similarly, the check valve 20Ra is a hydraulic oil in the pipe line C2 that connects the second port of the rear wheel traveling pump 14R and the first ports of the left rear wheel traveling motor 20L and the right rear wheel traveling motor 20R. The pressure is maintained at a predetermined pressure or higher. Specifically, the check valve 20Ra causes the hydraulic oil discharged from the charge pump 14C to flow into the pipe C2 when the pressure of the hydraulic oil in the pipe C2 falls below the discharge pressure of the charge pump 14C.

  The relief valve 20Lb maintains the pressure of the hydraulic oil in the pipe line C1 below a predetermined relief pressure. Specifically, the relief valve 20Lb causes the hydraulic oil in the pipe C1 to flow out of the closed circuit when the pressure of the hydraulic oil in the pipe C1 exceeds the relief pressure. Similarly, the relief valve 20Rb maintains the pressure of the hydraulic oil in the pipe line C2 below a predetermined relief pressure. Specifically, the relief valve 20Rb causes the hydraulic oil in the pipe C2 to flow out of the closed circuit when the pressure of the hydraulic oil in the pipe C2 exceeds the relief pressure.

  The reduction ratio control device 21L is a device that controls the reduction ratio of the reduction gear connected to the left rear wheel travel motor 20L. In the present embodiment, the reduction ratio control device 21L determines the reduction ratio of the reduction gear connected to the left rear wheel travel motor 20L using the hydraulic oil discharged from the charge pump 14C in response to a control command from the controller 30. adjust. The same applies to the reduction ratio control device 21R that adjusts the reduction ratio of the reduction gear connected to the right rear wheel travel motor 20R.

  The brake control device 22L is a device that controls the braking force of the left rear wheel brake that brakes the left rear wheel 5L of the asphalt finisher 100. In the present embodiment, the brake control device 22L adjusts the braking force of the left rear wheel brake using hydraulic oil discharged from the charge pump 14C in response to a control command from the controller 30. The same applies to the brake control device 22R that adjusts the braking force of the right rear wheel brake.

  The conveyor / screw drive unit F2 is a functional element that drives the conveyor and the screw. In the present embodiment, the conveyor screw driving unit F2 mainly includes a control valve 41, a left screw motor 42SL, a right screw motor 42SR, a left conveyor motor 42CL, a right conveyor motor 42CR, and a generator motor 42G.

  The left screw motor 42SL and the right screw motor 42SR rotate the screw 11. The left conveyor motor 42CL and the right conveyor motor 42CR rotate the conveyor 10. The generator motor 42G drives the generator 43 to rotate. The generator 43 generates electric power to be supplied to a heater or the like that heats a heating required portion of the asphalt finisher 100.

  Each of the left screw motor 42SL, the right screw motor 42SR, the left conveyor motor 42CL, the right conveyor motor 42CR, and the generator motor 42G is a fixed displacement hydraulic motor that forms an open circuit. Note that these hydraulic motors may be variable displacement hydraulic motors.

  The control valve 41 includes a conveyor control valve, a screw control valve, and a generator control valve. The conveyor control valve is switched in response to a control command from the controller 30, and causes the hydraulic oil discharged from the conveyor screw pump 14S to flow into at least one suction port of the left conveyor motor 42CL and the right conveyor motor 42CR, and The hydraulic oil flowing out from at least one discharge port of the left conveyor motor 42CL and the right conveyor motor 42CR is discharged to the hydraulic oil tank T. The screw control valve is switched in accordance with a control command from the controller 30, and causes the hydraulic oil discharged from the conveyor screw pump 14S to flow into at least one suction port of the left screw motor 42SL and the right screw motor 42SR, and The hydraulic oil flowing out from at least one discharge port of the left screw motor 42SL and the right screw motor 42SR is discharged to the hydraulic oil tank T. Similarly, the generator control valve is switched in response to a control command from the controller 30 to cause the hydraulic oil discharged from the conveyor screw pump 14S to flow into the suction port of the generator motor 42G, and for the generator. The hydraulic oil flowing out from the discharge port of the motor 42G is discharged to the hydraulic oil tank T.

  FIG. 3 is a diagram showing a configuration example of the exhaust gas treatment system 150 mounted on the asphalt finisher 100 of FIG. The exhaust gas treatment system 150 purifies exhaust gas discharged from the engine 6 that is a diesel engine.

  The exhaust gas processing device 7 is a device that purifies exhaust gas of the engine 6 in stages, and includes a first processing unit 7a and a second processing unit 7b. The 1st process part 7a is a diesel particulate filter which collects the particulate matter in exhaust gas, for example. The second processing unit 7b is, for example, a selective catalytic reduction (SCR) system that reduces and removes NOx in exhaust gas.

  The SCR system as the second processing unit 7b receives the supply of the liquid reducing agent and continuously reduces and removes NOx in the exhaust gas. In this embodiment, urea water (urea aqueous solution) is used as a liquid reducing agent for ease of handling.

  The air introduced into the intake pipe 6b through the air filter 6a passes through the turbocharger 61 and the intercooler 65 and is supplied to the engine 6. The exhaust gas from the engine 6 passes through the turbocharger 61, reaches the exhaust pipe 6c downstream thereof, is purified by the exhaust gas processing device 7, and is discharged into the atmosphere.

  A first processing unit 7 a and a second processing unit 7 b of the exhaust gas processing device 7 are connected in series to the exhaust pipe 6 c via a connection unit 63. The connecting portion 63 is provided with a urea water injection device 68 for supplying urea water to the SCR system. The urea water injection device 68 is connected to the urea water tank 9 via a urea water hose 69.

  A supply module SM is provided in the middle of the urea water hose 69. The supply module SM includes a urea water supply pump 70 and a filter 71. In the present embodiment, the supply module SM is configured such that a filter 71 is disposed between the urea water tank 9 and the urea water supply pump 70.

  The urea water stored in the urea water tank 9 is supplied to the urea water injection device 68 by the urea water supply pump 70, and the upstream position of the second processing unit 7b (SCR system) in the exhaust pipe 6c from the urea water injection device 68. It is injected toward

  The urea water injected from the urea water injection device 68 is supplied to the SCR system. The supplied urea water is hydrolyzed at the SCR system to produce ammonia. This ammonia reduces NOx contained in the exhaust gas. In this way, exhaust gas purification is performed.

  The first NOx sensor 72 and the second NOx sensor 73 are sensors that detect the NOx concentration in the exhaust gas. In the present embodiment, the first NOx sensor 72 is disposed on the upstream side of the urea water injection device 68, and the second NOx sensor 73 is disposed on the downstream side of the SCR system.

  The urea water remaining amount sensor 74 is a sensor that detects the urea water remaining amount in the urea water tank 9. The urea water concentration sensor 74 </ b> A is a sensor that detects the concentration of urea water in the urea water tank 9. In this embodiment, the urea water remaining amount sensor 74 and the urea water concentration sensor 74 </ b> A are disposed in the upper part of the urea water tank 9.

  The first NOx sensor 72, the second NOx sensor 73, the urea water remaining amount sensor 74, the urea water concentration sensor 74A, the urea water injection device 68, and the urea water supply pump 70 are connected to the exhaust gas controller 75. The exhaust gas controller 75 controls the urea water injection device 68 and the urea water supply pump 70 based on the NOx concentrations detected by the first NOx sensor 72 and the second NOx sensor 73, respectively, and an appropriate amount of urea water is injected. Like that.

  Further, the exhaust gas controller 75 calculates the ratio of the urea water remaining amount to the total volume of the urea water tank 9 based on the urea water remaining amount output from the urea water remaining amount sensor 74. In this embodiment, the ratio of the remaining amount of urea water to the total volume of the urea water tank 9 is the urea water remaining ratio. For example, the urea water remaining ratio 50 [%] indicates that the urea water half of the capacity of the urea water tank 9 remains in the urea water tank 9.

  The exhaust gas controller 75 is connected to an engine control module (hereinafter referred to as “ECM”) 60 via a CAN or the like. The ECM 60 is a device that controls the engine 6. The ECM 60 is connected to the controller 30 via a CAN or the like, and the controller 30 is connected to a monitor 77 (display device) via the CAN or the like. The monitor 77 can display warnings, operating conditions, and the like.

  Each of the ECM 60 and the exhaust gas controller 75 is an arithmetic device including a CPU, a RAM, a ROM, an input / output port, a storage device, and the like. The controller 30 can use various types of information regarding the exhaust gas processing system 150 that the exhaust gas controller 75 has.

  The exhaust gas treatment system 150 has a heat supply mechanism that supplies heat to the urea water tank 9 and the urea water hose 69. The heat supply mechanism is, for example, a mechanism for preventing freezing of urea water in a cold region or dissolving frozen urea water. In this embodiment, engine coolant (for example, long life coolant) of the engine 6 that passes through the coolant hose 80 is used.

  Specifically, the engine coolant immediately after cooling the engine 6 reaches the second portion 82 through the first portion 81 of the coolant hose 80 while maintaining a relatively high temperature. The second portion 82 is a part of the cooling water hose 80 that contacts the outer surface of the urea water tank 9. When the engine cooling water having a temperature higher than that of the urea water flows through the second portion 82, heat is supplied to the urea water tank 9 and the urea water in the urea water tank 9.

  Thereafter, the engine coolant reaches the third portion 83 and the supply module SM. The third portion 83 is a part of the cooling water hose 80 that is in close contact with the urea water hose 69. When the engine cooling water having a temperature higher than that of the urea water flows through the third portion 83 of the cooling water hose 80 along the urea water hose 69, the engine cooling water supplies heat to the urea water hose 69 and the urea water therein. Further, the engine cooling water having a temperature higher than that of the urea water flows into the supply module SM (including the urea water supply pump 70 and the filter 71) and the urea water in the inside thereof when flowing through the flow path formed in the supply module SM. Supply heat.

  Thereafter, the engine coolant that has reached a relatively low temperature after finishing the supply of heat in the second portion 82 and the third portion 83 reaches the heat exchanger unit 13 through the fourth portion 84 of the coolant hose 80. The fourth portion 84 is a part of the cooling water hose 80 routed between the third portion 83 and the heat exchanger unit 13, and does not adhere to the urea water hose 69.

  The fifth portion 85 is a part of the cooling water hose 80 used for cooling the urea water injection device 68. When the engine coolant having a temperature lower than that of the high temperature urea water injection device 68 flows through the fifth portion 85, the engine water takes heat from the high temperature urea water injection device 68 and cools the urea water injection device 68 to prevent overheating. . After that, when the engine cooling water that has been supplied with heat and has a relatively high temperature (higher than the urea water) flows through the sixth portion 86 (a part of the fifth portion 85) along the urea water hose 69, Heat is supplied to the urea water hose 69 and the urea water therein. When the urea water injection device 68 is in a low temperature state, the engine coolant having a temperature higher than that of the urea water injection device 68 in the low temperature state flows through the fifth portion 85, and the urea water injection device 68 and the urea water in the inside thereof. To supply heat. Thereafter, the engine coolant that has reached a relatively low temperature after the supply of heat in the sixth portion 86 has merged with the engine coolant that has flowed through the third portion 83, and then passes through the fourth portion 84 to generate heat. The switch unit 13 is reached.

  In this way, the heat supply mechanism supplies heat to the urea water tank 9, the urea water hose 69, the supply module SM, and the urea water injection device 68 using the engine cooling water, and the urea water inside them. Is prevented from being frozen, or frozen urea water is dissolved.

  Next, the urea water tank 9 will be described with reference to FIG. 4A is a front view of the urea water tank 9 (viewed from the −Y side), and FIG. 4B is a side view of the urea water tank 9 (viewed from the −X side). FIG. 4C is a view of the urea water tank 9 accommodated in the outer shell member 90 as viewed obliquely from below.

  As shown in FIG. 4A, the urea water tank 9 has a remaining amount indicator 9a on the front surface (the surface on the −Y side), and a drain plug 9b attached to the bottom surface (the surface on the −Z side). . Further, a filler 50 is connected via a filler hose 52 to the tank liquid supply port 9e at the front upper end (the −Y side end of the + Z side surface). Both ends of the filler hose 52 are fastened by a hose band 53. Also, as shown in FIG. 4B, a urea water remaining amount sensor 74 is attached to the rear end of the upper surface (the + Y side end of the + Z side surface).

  The filler 50 is a member for supplying urea water to the urea water tank, and a filler cap 50c is attached to the filler liquid supply port 50e. A filler side bracket 51 is attached to the filler 50.

  The filler side bracket 51 is a member for fixing the filler liquid supply port 50e of the filler 50 in a desired direction. For example, the filler side bracket 51 is fastened to a frame side bracket extending from the main body frame via a bolt. In the example of FIG. 4, the filler liquid supply port 50 e is fixed so as to face diagonally upward to the right when viewed from the urea water tank 9.

  The outer shell member 90 is a member that covers the urea water tank 9 and is configured to cover at least the bottom of the urea water tank 9. In the example of FIG. 4C, the outer shell member 90 includes a front plate member 91, a right plate member 92, a left plate member 93, a rear plate member 94, and a bottom plate member 95, and is substantially below the urea water tank 9. Cover half. The bottom plate member 95 has an opening 95a and an opening 95b. The drain plug 9b penetrates the opening 95a and protrudes downward (−Z direction). The opening 95b is a structure for reducing the weight, and may be omitted.

  After the urea water tank 9 is accommodated in the outer shell member 90, the operator attaches an inverted U-shaped fastener to the flange at the center of the upper surface of the urea water tank 9, so that the urea water tank 9 and the outer shell member 90 are To fix. The outer shell member 90 can be removed from the main body of the asphalt finisher 100 together with the urea water tank 9.

  Next, a protection structure for the drain plug 9b of the urea water tank 9 will be described with reference to FIG. FIG. 5 is a view of the lower surface of the asphalt finisher 100 (the portion on which the urea water tank 9 is mounted) as seen from an oblique lower side as indicated by an arrow V in FIG. As shown in FIG. 5, the urea water tank 9 is placed on the mounting member 96 while being accommodated in the outer shell member 90. The urea water tank 9 is disposed on the outer side (−Y side) of the conveyor 10 in the vehicle width direction.

  The mounting member 96 is a member configured to mount the urea water tank 9. In the example of FIG. 5, the mounting member 96 is attached to the main body frame. The mounting member 96 has an opening 96a and an opening 96b. The mounting member 96 has an opening 96a at a position corresponding to the drain plug 9b. The drain plug 9b penetrates the opening 96a and protrudes downward (−Z direction). The opening 96b is a configuration for weight reduction and may be omitted.

  A protective member 97 that protects the drain plug 9 b of the urea water tank 9 is attached to the lower surface (−Z side) of the mounting member 96. In the example of FIG. 5, the protection member 97 has an opening 97a at a position corresponding to the drain plug 9b. The drain plug 9b protrudes into the opening 97a, but does not penetrate the opening 97a. In other words, the lower end (−Z side tip) of the drain plug 9 b is located higher than the bottom surface (−Z side surface) of the protection member 97. This means that the distance from the ground to the protection member 97 is smaller than the distance from the ground to the drain plug 9b. The ground is, for example, a construction surface.

  With this configuration, the protection member 97 can prevent an object such as an obstacle under the asphalt finisher 100 from contacting the drain plug 9b even when the asphalt finisher 100 moves forward or backward. This is because the object comes into contact with the protective member 97 before coming into contact with the drain plug 9b. Therefore, the protection member 97 can reliably prevent the drain plug 9b from being damaged.

  The opening 96a and the opening 97a are configured so that the urea water tank 9 can slide on the mounting member 96 in the vehicle width direction (Y-axis direction). In the example of FIG. 5, the opening 96a and the opening 97a are configured to open toward the outside in the vehicle width direction (−Y side). The outer shell member 90 (containing the urea water tank 9) mounted on the mounting member 96 can be pulled out to the −Y side while sliding the bottom surface of the outer shell member 90 and the upper surface of the mounting member 96. It is for doing so. The outer shell member 90 (containing the urea water tank 9) removed from the asphalt finisher 100 can be pushed into the + Y side while sliding the bottom surface of the outer shell member 90 and the upper surface of the mounting member 96. It is for doing so.

  In the example of FIG. 5, the protection member 97 is configured as a single member so as to open only toward the −Y side, that is, to surround the + X side, the −X side, and the + Y side of the drain plug 9b. However, the protection member 97 may be composed of two members so as to protect the + X side and the −X side of the drain plug 9b separately.

  Next, with reference to FIG. 6, a procedure for pulling out the outer shell member 90 (containing the urea water tank 9) mounted on the mounting member 96 to the -Y side will be described. FIG. 6 is a partial side view of the asphalt finisher 100 showing a portion on which the urea water tank 9 is mounted. 6A shows a state when the leveling arm 3a is lowered to near the lower limit, and FIG. 6B shows a state when the leveling arm 3a is raised to near the upper limit.

  First, the worker raises the leveling arm 3a by contracting the leveling cylinder 3b in a state as shown in FIG. 6A where the filler 8c of the fuel tank 8 and the filler 50 of the urea water tank 9 are visible. .

  When the leveling cylinder 3b is contracted to raise the leveling arm 3a to a state as shown in FIG. 6B, the entire urea water tank 9 and the outer shell member 90 are exposed. Since the entire remaining amount indicator 9a is exposed and the visibility is improved, the operator can easily confirm the remaining amount of the urea water.

  In this state, when the operator removes the bolts that fasten the outer shell member 90 and the mounting member 96 and removes the harnesses, the worker moves the outer shell member 90 (containing the urea water tank 9) to the leveling arm. Without making contact with 3a, it can be pulled out to the -Y side.

  Thus, the operator can remove the outer shell member 90 from the asphalt finisher 100 together with the urea water tank 9 by raising the leveling arm 3a to near the upper limit.

  In the above-described example, the urea water tank 9 is disposed on the left side surface of the tractor 1, but may be disposed on the right side surface.

  Next, a method for fixing the filler liquid supply port 50e of the filler 50 in a desired direction will be described with reference to FIG. FIG. 7 is a partial front view of the upper part of the urea water tank 9 showing the filler 50 attached to the tank liquid supply port 9e.

  As shown in FIG. 7, a filler side bracket 51 is attached to the filler 50. The filler side bracket 51 is a member for fixing the filler liquid supply port 50e in a desired direction, and has a base portion 51a and a tongue portion 51b. The base 51 a is a flat plate member that is attached to the filler 50 so as to surround the filler 50. The tongue 51b is a flat plate member that extends at an angle from the base 51a.

  The filler side bracket 51 is fastened to the frame side bracket 111 extending from the main body (main body frame 110) of the asphalt finisher 100 via a bolt. Like the filler side bracket 51, the frame side bracket 111 is a member that cooperates with the filler side bracket 51 in order to fix the filler liquid supply port 50e in a desired direction, and has a base portion 111a and a tongue portion 111b. The base 111 a is a flat plate member that is attached to the main body frame 110 so as to extend from the main body frame 110. The tongue 111b is a flat plate member that extends at an angle from the base 111a.

  In the example of FIG. 7, the base part 51a and the tongue part 51b of the filler side bracket 51 are integrally formed. The inclination angle of the tongue 51b with respect to the base 51a determines the direction of the filler liquid supply port 50e. Similarly, the base 111a and the tongue 111b of the frame side bracket 111 are integrally formed. The inclination angle of the tongue 111b with respect to the base 111a determines the direction of the filler liquid supply port 50e. In the example of FIG. 7, each inclination angle is determined so that the filler liquid supply port 50 e faces diagonally upward to the right when viewed from the urea water tank 9 when the filler side bracket 51 is fastened to the frame side bracket 111. Directing the filler liquid supply port 50e diagonally to the right facilitates insertion of the liquid supply nozzle into the filler liquid supply port 50e by the operator.

  As shown in FIG. 6A, the tank liquid supply port 9e of the urea water tank 9 is disposed at a position behind the leveling arm 3a that is a component of the asphalt finisher 100 when viewed from the outside of the asphalt finisher 100. Yes. For this reason, the operator cannot directly insert the liquid supply nozzle into the tank liquid supply port 9e.

  On the other hand, as shown in FIG. 6A, the filler liquid supply port 50e of the filler 50 is disposed at a position that is not behind the leveling arm 3a when viewed from the outside of the asphalt finisher 100. Therefore, the operator can visually recognize the filler liquid supply port 50e from the outside of the asphalt finisher 100, and can easily insert the liquid supply nozzle into the filler liquid supply port 50e. As a result, urea water can be easily replenished and urea water spillage can be prevented.

  Next, another structural feature that facilitates the supply of urea water to the urea water tank 9 will be described with reference to FIG. FIG. 8 is a partial side view of the asphalt finisher 100 showing a portion on which the urea water tank 9 is mounted. FIG. 8 shows a state when the leveling arm 3a is lowered to near the lower limit.

  The leveling arm 3a shown in FIG. 8 is different from the leveling arm 3a shown in FIG. 6 in that a notch 3ax is formed. The filler liquid supply port 50e is disposed at a position corresponding to the notch 3ax so as not to be behind the leveling arm 3a when viewed from the outside of the asphalt finisher 100.

  With this configuration, the operator can visually recognize the filler liquid supply port 50e not only when the leveling arm 3a is lowered to near the lower limit but also when the leveling arm 3a is raised to some extent. Therefore, urea water can be easily replenished, and urea water spillage can be prevented.

  Next, another arrangement example of the urea water tank 9 in the asphalt finisher will be described with reference to FIG. FIG. 9A is a left side view of the asphalt finisher 100A and corresponds to FIG. FIG. 9B is a top view of the asphalt finisher 100A and corresponds to FIG.

  The asphalt finisher 100A shown in FIG. 9 has a urea water tank 9 mounted on the rear left side of the tractor 1, and the urea water tank 9 is arranged inside the front end of the left leveling arm 3a. Is different.

  In the example of FIG. 9, the urea water tank 9 is disposed on the front side (+ X side) of the rear partition 110 </ b> R that constitutes the main body frame 110. The main body frame 110 includes a front partition 110F and a rear partition 110R. A filler hose 52 connecting the tank liquid supply port 9e of the urea water tank 9 and the filler 50 extends rearward (−X direction) through the rear partition 110R. The filler 50 attached to the tip of the filler hose 52 is fixed using a bracket or the like so that the filler liquid supply port 50e can be seen from the outside at the rear end of the tractor 1.

  As described above, the tank liquid supply port 9e of the urea water tank 9 is disposed at a position behind the rear partition 110R that is a component of the asphalt finisher 100 when viewed from the outside of the asphalt finisher 100.

  On the other hand, the filler liquid supply port 50e of the filler 50 is disposed at a position that is not behind the rear partition 110R when viewed from the outside of the asphalt finisher 100.

  With this configuration, the operator can visually recognize the filler liquid supply port 50e from the outside of the asphalt finisher 100, and can easily insert the liquid supply nozzle into the filler liquid supply port 50e. As a result, urea water can be easily replenished and urea water spillage can be prevented.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  DESCRIPTION OF SYMBOLS 1 ... Tractor 1a ... Engine hood 1b ... Exterior cover 2 ... Hopper 2a ... Hopper cylinder 3 ... Screed 3a ... Leveling arm 3ax ... Notch 3b ... Leveling cylinder 4 ... front wheel 5 ... rear wheel 6 ... engine 6a ... air filter 6b ... intake pipe 6c ... exhaust pipe 7 ... exhaust gas treatment device 7a ... first Processing part 7b ... 2nd processing part 8 ... Fuel tank 8c ... Filler 9 ... Urea water tank 9a ... Remaining amount indicator 9b ... Drain plug 9e ... Tank liquid supply port 10 ... Conveyor 11 ... Screw 13 ... Heat exchanger unit 14 ... Hydraulic source 14C ... Charge pump 14C 14M ... Cylinder pump 14R ... Rear wheel pump 14S ... Conveyor screw pump 15, 15A ... Pump regulator 20L ... Left rear wheel motor 20R ... Right rear wheel motor 20La, 20Ra ... Check valve 20Lb, 20Rb ... Relief valve 21L, 21R ... Reduction ratio control device 22L, 22R ... Brake control device 30 ... Controller 41 ... Control valve 42SL ... Left screw motor 42SL 42SR ... Right screw motor 42CL: Left conveyor motor 42CR ... Right conveyor motor 42G ... Generator motor 43 ... Generator 50 ... Filler 50c ... Filler cap 50e ... Filler liquid supply port 51 ... Filler side bracket 51a ... Base 51b ... Tongue 52 .... Filler hose 53 ... Hose band 60 ... Engine control module 61 ... Turbocharger 63 ... Connection part 65 ... Intercooler 68 ... Urea water injection device 69 ... Urea water hose DESCRIPTION OF SYMBOLS 70 ... Urea water supply pump 71 ... Filter 72 ... 1st NOx sensor 73 ... 2nd NOx sensor 74 ... Urea water residual quantity sensor 74A ... Urea water concentration sensor 75 ... Exhaust gas Controller 77 ... Monitor 80 ... Cooling water hose 81 ... First part 82 ... Second part 83 ... Third part 84 ... Fourth part 85 ... Fifth part 86 .. sixth portion 90 ... outer shell member 91 ... front plate member 92 ... right plate member 93 ... left plate member 94 ... rear plate member 95 ... bottom plate member 5a, 95b ... opening 96 ... mounting member 96a, 96b ... opening 97 ... protective member 97a ... opening 100 ... asphalt finisher 110 ... body frame 110F ... front partition 110R ... Rear partition 111 ... Frame side bracket 111a ... Base 111b ... Tongue 150 ... Exhaust gas treatment system C1, C2 ... Pipe F1 ... Rear wheel drive F2 ..Conveyor screw drive unit Display unit SM ... Supply module

Claims (5)

A tractor,
A hopper installed on the front side of the tractor;
A conveyor for conveying the paving material in the hopper to the rear side of the tractor;
A screw that spreads the paving material conveyed by the conveyor and spread on the road surface in the vehicle width direction;
A screed that spreads the paving material spread by the screw on the rear side of the screw,
An engine disposed in the engine compartment of the tractor ;
An exhaust gas treatment device for purifying the exhaust gas of the engine;
A liquid reducing agent tank for storing the liquid reducing agent consumed in the exhaust gas treatment device;
An asphalt finisher comprising a filler connected to a tank liquid supply port of the liquid reducing agent tank,
The tank liquid supply port is disposed at a position to become the shadow of the components of the asphalt finisher as viewed from the outside of the asphalt finisher,
The filler liquid supply port of the filler is placed in a position not viewed from the outside of the asphalt finisher in the shadow of the components of the asphalt finisher,
Asphalt finisher . The filler and the tank liquid supply port are connected by a filler hose,
The asphalt finisher according to claim 1. A bracket is attached to the filler,
The bracket is attached to the body of the asphalt finisher ,
The asphalt finisher according to claim 1 or 2. The tank liquid supply port is disposed at a position behind the leveling arm as seen from the outside of the asphalt finisher .
The asphalt finisher according to any one of claims 1 to 3. The leveling arm is formed with a notch,
The filler liquid supply port is arranged at a position corresponding to the notch so as not to be behind the leveling arm as seen from the outside of the asphalt finisher .
The asphalt finisher according to claim 4.

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