Work vehicle

Abstract

This work vehicle is equipped with, on a traveling vehicle body thereof, an exhaust gas treatment device and a urea water tank which stores urea water to be supplied to the exhaust gas treatment device. The work vehicle has a radiator equipped between an engine and the urea water tank, whereby an arrangement configuration in which the urea water tank is hardly affected by exhaust heat is provided.

Description

Work vehicles

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

[0002] One configuration has fuel tanks arranged on the left and right sides of a transmission case that forms part of the vehicle body, and a urea water tank for a urea SCR system is arranged immediately before one of the fuel tanks (Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2020-93687

[0004] In the conventional work vehicles described above, the temperature of the urea water tank rises due to the effects of exhaust heat from the engine and outside air temperature, and as the urea water deteriorates, the purification performance of the exhaust gas treatment device decreases. Therefore, the present invention aims to solve such problems.

[0005] In order to solve the above-mentioned problems, the following configuration is provided.

[0006] The present invention is a work vehicle having an exhaust gas treatment device and a urea water tank for storing urea water to be supplied to the exhaust gas treatment device on a traveling vehicle body, characterized in that a radiator is provided between the engine and the urea water tank.

[0007] The present invention provides a radiator between the engine and the urea water tank, thereby preventing the temperature of the urea water tank (22) from rising and preventing deterioration of the urea water, thereby maintaining purification performance.

[0008] FIG. 1 is an overall side view of a tractor. FIG. 2 is a front view of the front part of the tractor. FIG. 3 is a plan view of the front part of the tractor. FIG. 4 is a left side view of the front part of the tractor. FIG. 5 is a right side view of the front part of the tractor. FIG. 6 is a perspective view of the front part of the tractor from the upper front. FIG. 7 is a perspective view of the container from the lower rear. FIG. 8 is a perspective view of the container from the upper rear. FIG. 9 is a perspective view of the aqueous urea tank.

[0009] An embodiment in which the present invention is applied to an agricultural tractor will be described below with reference to the drawings.

[0010] As shown in FIG. 1, the tractor T has an engine E mounted inside a hood 1 at the front of the vehicle body, and the rotational power of the engine E is transmitted to left and right front wheels 3, 3 and left and right rear wheels 4, 4 via a transmission in a transmission case 2.

[0011] A cylinder case (not shown) housing a hydraulic cylinder (not shown) for lifting and lowering the work equipment is provided at the upper rear part of the transmission case 2, and lift arms 8, 8 are mounted on the rear of the cylinder case so as to be able to rotate up and down, and the lift arms 8, 8 are rotated up and down by the extension and contraction action of the pistons of the hydraulic cylinders. A three-point link mechanism (not shown) consisting of an upper link and left and right lower links is provided at the rear of the transmission case 2, and is configured to connect various work equipment.

[0012] A handle column (not shown) is erected behind the engine E, and a steering wheel (not shown) is journaled on 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.

[0013] Next, the layout of the accessories and the container 21 inside the bonnet 1 will be described with reference to FIGS.

[0014] An engine E is mounted in front of the transmission case 2, and a front frame 6 extends from the engine E. The front frame 6 is composed of left and right frames 6a, 6b and a left-right connecting frame 6c that connects the front ends of the left and right frames 6a, 6b. A mast 16 is provided at the rear of the engine E, and a hood 1 is attached so that it can be opened and closed freely, with the engine E mounted behind the front frame 6. A radiator 9 is provided at the rear of the front frame 6 so as to be located in front of the engine E, an oil cooler 12 is provided above and in front of the radiator 9, an intercooler 11 is provided in front of the oil cooler 12, and a condenser 10 is disposed in front of the radiator 9.

[0015] The container 21 has a rectangular space formed by a bottom surface 21e and side surfaces (21a, 21b, 21c, 21d). A first side surface 21a is provided rising from the bottom surface 21e, and the container 21 is composed of a second side surface 21b facing the first side surface 21a, a third side surface 21c adjacent to the first side surface 21a and the second side surface 21b, and a fourth side surface 21d facing the third side surface 21c.

[0016] The bottom surface 21e of the housing 21 is positioned so as to be lower than the lower end of the radiator 9, and the distance from the first side surface 21a to the second side surface 21b is within the distance from the front end of the engine ECU 14 to the position in front of the radiator 9. The second side surface 21b is positioned so as to be in front of the radiator 9 and behind the condenser 10. The distance from the third side surface 21c to the fourth side surface 21d is positioned so as to be narrower than the width of the condenser 10.

[0017] The engine ECU 14 and the air cleaner 13 are disposed on the housing 21. A cooling fan 15 is provided between the engine E and the radiator 9.

[0018] When the cooling fan 15 rotates, a weak wind flows rearward in the center of the cooling fan 15, and a strong wind flows rearward around the periphery of the cooling fan 15, cooling the radiator 9, condenser 10, intercooler 11, oil cooler 12, and other auxiliary equipment, and cooling the engine E.

[0019] According to the above configuration, by arranging the housing 21 at a low position so that it can be dropped into the hole 7a of the base plate 7, the housing 21 can be positioned lower than the auxiliary devices such as the condenser 10, intercooler 11, and oil cooler 12, and the cooling fan 15, and the cooling effect of the radiator 9, condenser 10, intercooler 11, and oil cooler 12 can be improved without blocking the flow of cooling air.

[0020] Furthermore, the condenser 10, intercooler 11, oil cooler 12, etc. are arranged facing each other at peripheral locations spaced apart above, below, to the left, and to the right from the rotation center of the cooling fan 15 when viewed from the front, thereby enhancing the cooling effect.

[0021] The layout of the urea water tank 22 will be described with reference to FIG.

[0022] The base plate 7 forms the floor of the front part of the hood space. A hole 7a is formed in the base plate 7, and a container 21 is attached to the hole 7a. A urea water tank 22 and a supply module 23 are placed inside the container 21. The supply module 23 is located offset to one side of the center of the vehicle body.

[0023] The layout of the exhaust gas treatment device 30 will now be described. As shown in Figure 6 and other figures, the DOC 31 has a substantially cylindrical appearance and is disposed at the rear upper portion of the engine E with its longitudinal direction oriented in the left-right direction. The SCR 34 is also cylindrical and disposed to the side of the engine E with its longitudinal direction oriented in the up-down direction, and an exhaust pipe 35 is provided on the upper surface of the SCR 34. The connecting pipe 33 is a pipe for connecting the DOC 31 and the SCR 34, and connects the DOC 31 and the dosing module 32 to the upstream side of the connecting pipe 33 and the SCR 34 to the downstream side.

[0024] The exhaust gas treatment device 30 discharges exhaust gas combusted by the engine E to the outside with impurities in the exhaust gas purified. Regulated exhaust gas components oxidized by the DOC 31 pass through a connecting pipe 33. Upstream of the connecting pipe 33, a dosing module 32 injects urea water sent from the urea water tank 22 through the supply module 23, and the urea water is sent to an SCR 34 located downstream of the connecting pipe 33 and near the engine E. An exhaust port formed at the top of the SCR 34 is connected to an exhaust pipe 35 that leads the exhaust gas to the outside.

[0025] The layout of the urea water tank 22 and the supply module 23 will be described with reference to FIG.

[0026] There is provided a supply module 23 that pressure-feeds urea water to the dosing module 32, and a urea water tank 22 that stores the urea water to be supplied to the supply module 23. The urea water tank 22 is composed of a side portion 22b and an upper portion 22a that protrudes from the upper portion of the side portion 22b, and the supply module 23 is installed so that its sides and upper surface are covered by the urea water tank 22.

[0027] The urea water tank 22 has a refill port 22c for refilling urea water 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 refill port 22c is located offset to one side of the center of the vehicle body, either to the left or right. The hoses are composed of a first hose 22e for supplying urea water from the urea water tank 22 to the supply module 23, a third hose 22f for supplying urea water from the supply module 23 to the exhaust gas treatment device 30, and a second hose 22g for returning excess urea water to the urea water tank 22 when the urea water is pumped.

[0028] With this configuration, the urea water tank 22 can be located further forward than the engine E, preventing it from being affected by exhaust heat from the engine E. Furthermore, by positioning the refill port 22c above the base plate 7 and offset from the center of the aircraft, the weight mounting portion 17 can be avoided, facilitating urea water refilling from the side. Furthermore, by positioning the refill port 22c and the urea water tank hose connection portion 22i offset to one side, respectively, and configuring the upper end of the urea water tank 22 to be at or below the height of the upper end of the radiator 9, and by positioning the tank with its longitudinal direction facing up and down so that the side of the engine ECU 14 faces forward, the airflow entering from the front of the hood 1 is not obstructed. This improves the flow of cooling air, enabling it to be efficiently delivered to the radiator 9, thereby enhancing the cooling effect. Furthermore, since the urea water tank 22 can be located near the supply module 23, the hose can be made shorter than when the tank is located further away, resulting in cost savings.

[0029] The container 21 will be described with reference to FIGS.

[0030] The container 21 is installed in a hole 7a in the base plate 7. The container 21 can be removed from the base plate 7 together with the urea water tank 22 and the supply module 23. A first hole 21f and a second hole 21g are formed in the bottom surface 21e so as to be positioned below the urea water tank 22 and the supply module 23.

[0031] These configurations protect the urea water tank 22 and the supply module 23 from mud, stones, etc. that may be kicked up when the urea water tank 22 is used in a farm field. The lower bottom surface of the urea water tank 22 has a drain plug 22h for discharging the urea water, and a first hole 21f is provided in the bottom surface 21e at a position opposite the drain plug 22h, so that the urea water tank 22 does not need to be removed from the container 21, and the urea water can be easily discharged.

[0032] The supply module 23 has a filter replacement section 23a at the bottom of the bottom surface for replacing the filter, and a second hole section 21g is provided in the bottom surface section 21e at a position opposite the filter replacement section 23a, so that the filter can be easily replaced without having to remove the supply module 23 from the housing body 21.

[0033] The housing 21 has an opening 21h and a cutout 21i in the wall near the supply module hose connection portion 23b and the harness connection portion 23c. This configuration allows for easy connection and disconnection of the hoses (22e, 22f, 22g) connected to the supply module 23 and the harness terminals that transmit power and signals. By locating the urea water tank 22 and the supply module 23 in close proximity, the hose length can be shortened. The urea water tank 22 is shaped to cover the sides and top of the supply module 23, so the supply module 23 does not protrude from the hole 7a in the base plate 7, preventing obstruction of air being sent to the radiator 9 from the front of the hood 1. By locating the refill port 22c offset to one side of the center of the vehicle, water can be easily supplied from the left and right directions of the vehicle.

[0034] T Tractor E Engine 7 Base plate 7a Hole 21 Container 22 Urea water tank 22c Refill port 23 Supply module 30 Exhaust gas treatment device

Claims

1. A work vehicle having an exhaust gas treatment device on a vehicle body and a urea water tank for storing urea water to be supplied to the exhaust gas treatment device, characterized in that a radiator is provided between the engine and the urea water tank.

2. A work vehicle as described in claim 1, characterized in that a base plate serving as a floor is provided in front of the radiator, a hole is provided in the base plate, a container is provided below the hole in the base plate, and a supply module is provided that supplies urea water to the exhaust gas treatment device, and the supply module is contained within the container together with the urea water tank.

3. A work vehicle according to claim 1 or 2, characterized in that a refill port for refilling the urea water tank with urea water is provided inside the bonnet at a position offset to one side to the right or left from the lateral center of the vehicle body.

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