Work vehicle

Abstract

To form an arrangement in which an urea water tank is less affected by waste heat.SOLUTION: A work vehicle is equipped with, on a traveling vehicle body thereof, an exhaust gas treatment device 30 and a urea water tank which stores urea water to be supplied to the exhaust gas treatment device 30. An engine E is provided at a front part of the traveling vehicle body and a radiator 9 is provided in front of the engine. A base plate 7 serving as a floor part is provided in front of the radiator 9. A hole part 7a is provided at the base plate 7 and the urea water tank 22 is provided at the hole part 7a. An upper end of the urea water tank 7a is located at a lower position than an upper end of the radiator.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a work vehicle equipped with an exhaust gas treatment device.

Background Art

[0002] There is a configuration in which fuel tanks are arranged on the left and right sides of a transmission case constituting a traveling vehicle body, and an aqueous urea tank of a urea SCR system is arranged immediately in front of one of the fuel tanks (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above conventional work vehicle, due to being affected by exhaust heat from the engine and outside air temperature, the temperature of the aqueous urea tank rises, and when the aqueous urea deteriorates, there is a problem that the purification performance in the exhaust gas treatment device deteriorates. Therefore, the present invention aims to solve such a problem.

Means for Solving the Problems

[0005] In order to solve the above-described problems, the configuration is as follows.

[0006] The invention according to claim 1 is a work vehicle provided with an exhaust gas treatment device (30) on a traveling vehicle body and a urea water tank (22) for storing urea water to be supplied to the exhaust gas treatment device (30), wherein an engine (E) is provided at the front part of the traveling vehicle body, a radiator (9) is provided in front of the engine, a base plate (7) which is a floor part is provided in front of the radiator (9), a hole part (7a) is provided in the base plate (7), the urea water tank (22) is provided in the hole part (7a), and the upper end part of the urea water tank (7a) is configured to be lower than the upper end part of the radiator (9).

[0007] The invention according to claim 2 is the work vehicle according to claim 1, characterized in that a supply module (23) for supplying urea water to the exhaust gas treatment device (30) is provided, and the supply module (23) is provided in the hole part (7a) of the base plate (7) together with the urea water tank (22).

[0008] The invention according to claim 3 is the work vehicle according to claim 2, characterized in that the urea water tank (22) has a shape covering the side surface and the upper surface of the supply module (23).

[0009] The invention according to claim 4 is the work vehicle according to any one of claims 1 to 3, characterized in that a replenishment port (22c) for replenishing urea water to the urea water tank (22) is provided at a position above the base plate (7) and offset to one side left or right from the center of the vehicle body left and right.

Advantages of the Invention

[0010] The invention according to claim 1 can maintain the purification performance by preventing the temperature rise of the urea water tank (22) and preventing the deterioration of the urea water by arranging the urea water tank (22) in front of the engine (E) and the radiator (9).

[0011] The invention according to claim 2 can shorten the length of the hose by arranging the urea water tank (22) and the supply module (23) in proximity in addition to the effect of the invention according to claim 1.

[0012] In the invention according to claim 3, since the urea water tank (22) is shaped to cover the side surface and the upper surface of the supply module (23), the supply module (23) does not protrude from the hole (7a) of the base plate (7), so that the air sent from the front part of the bonnet to the radiator is not obstructed.

[0013] In the invention according to claim 4, by providing the replenishment port (22c) to be unevenly distributed on one side in the left - right direction with respect to the center of the machine body, it is possible to facilitate water supply from the left - right direction of the machine body.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

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Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying out the Invention

[0015] Hereinafter, embodiments of applying this invention to an agricultural tractor will be described based on the drawings.

[0016] As shown in FIG. 1, in the tractor T, an engine E is provided in a bonnet 1 at the front part of the vehicle body, and the rotational power of the engine E is transmitted to the left and right front wheels 3, 3 and the left and right rear wheels 4, 4 via a transmission in a transmission case 2.

[0017] Further, a cylinder case (not shown) with a hydraulic cylinder (not shown) for lifting the working machine is provided at the upper rear side of the transmission case 2, and lift arms 8, 8 are pivotally mounted at the rear part of the cylinder case so as to be rotatable vertically, and the lift arms 8, 8 are configured to rotate vertically by the telescopic operation of the piston of the hydraulic cylinder. Further, a three-point link mechanism (not shown) consisting of an upper link and left and right lower links is provided at the rear part of the transmission case 2, and various working machines are configured to be connected thereto.

[0018] Also, a handle column (not shown) is erected behind the engine E, and a steering handle (not shown) is pivotally supported at the upper part of the handle column. A floor (not shown) is provided above the transmission case 2, and a forward pedal, a reverse pedal, left and right brake pedals, a clutch pedal, and an accelerator pedal are provided on the floor in a well-known configuration.

[0019] Next, the arrangement and configuration of the auxiliary devices and the housing 21 inside the bonnet will be described with reference to FIGS. 2 to 6.

[0020] The engine E is provided in front of the transmission case 2, and the front frame 6 extends from the engine E. The front frame 6 is composed of left and right frames 6a, 6b and a connecting frame 6c in the left-right direction connecting the front end portions of the left and right frames 6a, 6b. A mast 16 is provided at the rear part of the engine E, the bonnet 1 is attached so as to be openable and closable, and the engine E is mounted at the rear side of the front frame 6. A radiator 9 is provided at the rear part of the front frame 6 so as to be located in front of the engine E, an oil cooler 12 is provided at the upper front part of the radiator 9, an intercooler 11 is provided in front of the oil cooler 12, and a capacitor 10 is disposed in front of it.

[0021] In addition, the container 21 creates a rectangular space and is formed by a bottom surface portion 21e and side surface portions (21a, 21b, 21c, 21d). A first side surface portion 21a is provided so as to rise from the bottom surface portion 21e, and is composed of a second side surface portion 21b facing the first side surface portion 21a, a third side surface portion 21c adjacent to the first side surface portion 21a and the second side surface portion 21b, and a fourth side surface portion 21d facing the third side surface portion 21c.

[0022] The bottom surface portion 21e of the container 21 is positioned lower than the lower end of the radiator 9, and the distance from the first side surface portion 21a to the second side surface portion 21b is within the distance from the front end of the engine ECU 14 to in front of the radiator 9. Further, the second side surface portion 21b is arranged to be positioned in front of the radiator 9 and behind the capacitor 10. The distance from the third side surface portion 21c to the fourth side surface portion 21d is arranged to be a distance narrower than the width of the capacitor 10.

[0023] And, the engine ECU 14 and the air cleaner 13 are disposed on the container 21. Further, a cooling fan 15 is provided between the engine E and the radiator 9.

[0024] When the cooling fan 15 rotates, a weak wind flows rearward at the central portion of the cooling fan 15, and a strong wind flows rearward at the peripheral portion of the cooling fan 15 while cooling auxiliary devices such as the radiator 9, the capacitor 10, the intercooler 11, and the oil cooler 12, and cooling the engine E.

[0025] According to the above configuration, by disposing the container 21 at a low position so as to drop it into the hole portion 7a of the base plate 7, the container 21 can be disposed lower than auxiliary devices such as the capacitor 10, the intercooler 11, the oil cooler 12, and the cooling fan 15, and the cooling effects of the radiator 9, the capacitor 10, the intercooler 11, and the oil cooler 12 can be enhanced without obstructing the flow of the cooling air.

[0026] Further, by arranging the capacitor 10, the intercooler 11, the oil cooler 12, etc. to face the peripheral portions that are vertically, horizontally, and away from the rotation center of the cooling fan 15 in the front view, the cooling effect can be enhanced.

[0027] Based on FIG. 6, the arrangement configuration of the urea water tank 22 will be described.

[0028] The base plate 7 constitutes the floor portion at the front of the bonnet space. The base plate 7 is provided with a hole portion 7a, and a housing 21 is attached to the hole portion 7a. The urea water tank 22 and the supply module 23 are dropped into the housing 21. Further, the supply module 23 is provided so as to be unevenly distributed on one side in the left - right direction with respect to the center of the machine body.

[0029] The arrangement configuration of this exhaust gas treatment device 30 will be described. As shown in FIG. 6 and the like, the DOC 31 has a substantially cylindrical appearance and is arranged with its longitudinal direction in the left - right direction in a state of being located at the upper rear of the engine E. The SCR 34 is cylindrical and is arranged with its longitudinal direction in the vertical direction on the side of the engine E, and an exhaust pipe 35 is provided on the upper surface of the SCR 34. The connection pipe 33 is a pipe for connecting the DOC 31 and the SCR 34. The DOC 31 and the dosing module 32 are connected on the upstream side of the connection pipe 33, and the SCR 34 is connected on the downstream side.

[0030] The exhaust gas treatment device 30 exhausts the exhaust gas burned by the engine E to the outside in a state where the impurities in the exhaust gas are purified. The regulated exhaust gas components oxidized by the DOC 31 pass through the connection pipe 33. Upstream of the connection pipe 33, the urea water sent from the urea water tank 22 through the supply module 23 by the dosing module 32 is injected and sent to the SCR 34 provided downstream of the connection pipe 33 and in the vicinity of the engine E. An exhaust pipe 35 for guiding the exhaust gas to the outside is connected to the exhaust port formed at the upper part of the SCR 34.

[0031] Based on FIG. 9, the arrangement configuration of the urea water tank 22 and the supply module 23 will be described.

[0032] A supply module 23 that pumps urea aqueous solution to the dosing module 33 and a urea aqueous solution tank 22 that stores the urea aqueous solution supplied to the supply module 23 are provided. The urea aqueous solution tank 22 is composed of a side portion 22b and an upper portion 22a that protrudes from above the side portion 22b, and the supply module 23 is installed so as to cover the side surface and the upper surface by the urea aqueous solution tank 22.

[0033] The urea aqueous solution tank 22 has a replenishment port 22c for replenishing urea aqueous solution on the upper surface of the upper portion 22a, and is connected to the supply module 23 by a flexible first hose 22e and a second hose 22g. The replenishment port 22c is provided so as to be unevenly distributed on one side, left or right, with respect to the center of the vehicle body. Each hose is composed of a first hose 22e that supplies urea aqueous solution from the urea aqueous solution tank 22 to the supply module 23, a third hose 22f that supplies urea aqueous solution from the supply module 23 to the exhaust gas regulating device 30, and a second hose 22g for returning the surplus urea aqueous solution to the urea aqueous solution tank 22 when pumping the urea aqueous solution.

[0034] With the above configuration, since the urea aqueous solution tank 22 can be arranged in front of the vehicle body with respect to the engine E, it is not affected by the exhaust heat from the engine. Further, by shifting the replenishment port 22c above the base plate 7 and offset from the center of the vehicle body, the weight attachment portion 17 can be avoided, so that it is easier to replenish the urea aqueous solution from the side. Furthermore, the replenishment port 22c and the urea aqueous solution tank hose connection portion 22i are arranged so as to be offset to one side, left or right, respectively, and the urea aqueous solution tank 22 is configured to be below the height of the radiator 9, and the longitudinal direction is arranged in the vertical direction with the side surface of the engine ECU facing the front, so that the configuration does not obstruct the wind coming in from the front of the bonnet. Therefore, the flow of the cooling air is improved, and it is possible to efficiently send the wind to the radiator 9, so that the cooling effect can be enhanced. Furthermore, since the urea aqueous solution tank 22 can be arranged in the vicinity of the supply module 23, the hose can be made shorter than when they are arranged separately, resulting in cost reduction.

[0035] Based on FIGS. 7 to 8, the container 21 will be described.

[0036] The container 21 is installed in the hole 7a of the base plate 7. Further, the entire container 21 can be removed from the base plate 7 together with the urea water tank 22 and the supply module 23. The first hole 21f and the second hole 21g are opened in the bottom surface portion 21e so as to be located below the urea water tank 22 and the supply module 23.

[0037] With these configurations, when used in the field, the urea water tank 22 and the supply module 23 are protected from the mud, stones, etc. that are lifted up. Further, the lower bottom surface of the urea water tank 22 has a drain plug 22h for discharging urea water, and the first hole 21f is provided at a position facing the drain plug 22h on the third side surface portion 21c, so that there is no need to take out the urea water tank 22 from the container 21, and the urea water can be easily discharged.

[0038] The supply module 23 has a filter replacement portion 23a for replacing the filter at the lower bottom surface, and the second hole 21g is provided in the bottom surface portion 21e at a position facing the filter replacement portion 23a, so that there is no need to take out the supply module 23 from the container 21, and the filter can be easily replaced.

[0039] In the container 21, an opening 21h and a notch 21i are provided in the wall near the supply module hose connection portion 23b and the harness connection portion 23c. With the above configuration, the connection and disconnection of each hose (22e, 22f, 22g) connected to the supply module 23 and the connection of the harness terminals for sending power and signals can be easily performed.

Explanation of Reference Numerals

[0040] T tractor E engine 7 base plate 7a hole 21 container 22 urea water tank 23 Supply module 22c Supply port 30 Exhaust gas treatment device

Claims

1. In a work vehicle provided with an exhaust gas treatment device on a traveling vehicle body and a urea water tank for storing urea water to be supplied to the exhaust gas treatment device, an engine is provided at the front part of the traveling vehicle body, a radiator is provided in front of the engine, a base plate which is a floor part is provided in front of the radiator, a hole part is provided in the base plate, and the urea water tank is provided in the hole part, The work vehicle is characterized in that the upper end part of the urea water tank is configured to be lower than the upper end part of the radiator.

2. A supply module for supplying urea water to the exhaust gas treatment device is provided, The work vehicle according to claim 1, wherein the supply module is provided in the hole part of the base plate together with the urea water tank.

3. The work vehicle according to claim 2, wherein the urea water tank has a shape covering the side surface and the upper surface of the supply module.

4. The work vehicle according to any one of claims 1 to 3, wherein a replenishment port for replenishing urea water to the urea water tank is provided at a position above the base plate and offset to one side left or right from the center of the vehicle body left and right.

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