Work vehicle

Abstract

A work vehicle is provided with an exhaust gas treatment device and a urea water tank that stores urea water supplied to the exhaust gas treatment device, wherein a radiator is provided between the engine and the urea water tank, whereby a configuration is provided in which the urea water tank is less likely to be affected by exhaust heat.

Description

Technical Field

[0001] This invention relates to work vehicles equipped with exhaust gas treatment devices. Background Technology

[0002] The structure is as follows: fuel tanks are arranged on the left and right sides of the gearbox that constitutes the vehicle body, and a urea water tank of the urea SCR system is arranged near the fuel tank on one side (Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-93687 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the aforementioned conventional vehicles, the following drawback exists: when the temperature of the urea tank rises and the urea deteriorates due to heat from the engine exhaust and external temperature, the purification performance of the exhaust gas treatment device decreases. Therefore, the present invention aims to eliminate this drawback.

[0008] Methods for solving problems

[0009] To solve the above problems, the following structure is adopted.

[0010] The present invention is a work vehicle, which is equipped with: an exhaust gas treatment device and a urea water tank for storing urea water supplied to the exhaust gas treatment device, characterized in that a radiator is provided between the engine and the urea water tank.

[0011] Invention Effects

[0012] The present invention provides a radiator between the engine and the urea tank, which can prevent the temperature of the urea tank 22 from rising and prevent the urea water from deteriorating, thereby maintaining the purification performance. Attached Figure Description

[0013] Figure 1 This is an overall side view of the tractor.

[0014] Figure 2 This is a front view of the tractor.

[0015] Figure 3 This is a top view of the front of the tractor.

[0016] Figure 4 This is a left-side view of the front of the tractor.

[0017] Figure 5 This is a right-side view of the front of the tractor.

[0018] Figure 6 This is a three-dimensional view of the front of the tractor from the top front.

[0019] Figure 7 This is a 3D view of the storage unit from the lower rear.

[0020] Figure 8 This is a 3D view of the storage unit viewed from the upper rear.

[0021] Figure 9 This is a 3D diagram of a urea tank. Detailed Implementation

[0022] The following describes an embodiment of the invention applied to an agricultural tractor, based on the accompanying drawings.

[0023] like Figure 1 As shown, the tractor T has an engine E installed in the engine hood 1 at the front of the vehicle body. 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 through the transmission device in the gearbox 2.

[0024] In addition, a cylinder housing (not shown) containing a hydraulic cylinder for lifting the work machine is installed on the upper rear side of the aforementioned gearbox 2. Lifting arms 8 and 8 are mounted on a pivot shaft at the rear of the cylinder housing, rotating freely up and down. The lifting arms 8 and 8 rotate up and down by the extension and retraction of the piston in the hydraulic cylinder. Furthermore, a three-point linkage mechanism (not shown) consisting of an upper connecting rod and left and right lower connecting rods is installed at the rear of the aforementioned gearbox 2, connecting various work machines.

[0025] Additionally, a steering column (not shown) is erected behind the engine E, and a steering wheel (not shown) is pivotally supported on the upper part of the steering column. A floor (not shown) is provided on the upper side of the transmission 2, and the forward pedal, reverse pedal, left and right brake pedals, clutch pedal, and accelerator pedal are provided on the floor; these are known structures.

[0026] Next, based on Figures 2-6 This describes the configuration and structure of the auxiliary equipment and storage unit 21 inside the engine hood.

[0027] An engine E is mounted on the front side of the gearbox 2, and a front frame 6 extends from the engine E. This front frame 6 consists of left and right frames 6a and 6b, and a connecting frame 6c connecting the front ends of the left and right frames 6a and 6b in the left-right direction. A mast 16 is mounted at the rear of the engine E, and the engine hood 1 is installed in a freely opening and closing manner. The engine E is mounted on the rear side of the front frame 6. A radiator 9 is mounted at the rear of the front frame 6, positioned in front of the engine E. An oil cooler 12 is mounted on the upper front of the radiator 9, an intercooler 11 is mounted in front of the oil cooler 12, and a condenser 10 is mounted in front of the intercooler 11.

[0028] Furthermore, the storage body 21 creates a rectangular space, formed by a bottom portion 21e and side portions 21a, 21b, 21c, and 21d. A first side portion 21a is provided in a way that rises from the bottom portion 21e, and is composed of a second side portion 21b facing the first side portion 21a, a third side portion 21c adjacent to the first side portion 21a and the second side portion 21b, and a fourth side portion 21d facing the third side portion 21c.

[0029] The bottom portion 21e of the housing 21 is located lower than the lower end of the radiator 9. The distance from the first side portion 21a to the second side portion 21b is within the distance from the front end of the engine ECU (Electrical Conversion Unit) 14 to a position forward of the radiator 9. Furthermore, the second side portion 21b is configured to be located forward of the radiator 9 and rear of the condenser 10. The distance from the third side portion 21c to the fourth side portion 21d is configured to be narrower than the width of the condenser 10.

[0030] Furthermore, an engine ECU 14 and an air filter 13 are mounted on the housing 21. Additionally, a cooling fan 15 is provided between the engine E and the radiator 9.

[0031] Furthermore, when the cooling fan 15 rotates, a weak airflow flows backward in the center of the cooling fan 15, and a strong airflow flows backward in the periphery of the cooling fan 15, thereby cooling auxiliary equipment such as the radiator 9, condenser 10, intercooler 11, and oil cooler 12, and also cooling the engine E.

[0032] According to the above structure, by arranging the housing 21 at a lower position so as to fall into the hole 7a of the substrate 7, the housing 21 can be arranged lower than auxiliary equipment such as the condenser 10, the intercooler 11, the oil cooler 12, and the cooling fan 15, so as not to block the flow of cooling air and improve the cooling effect of the radiator 9, the condenser 10, the intercooler 11, and the oil cooler 12.

[0033] In addition, by arranging the condenser 10, intercooler 11, oil cooler 12, etc., opposite each other in the peripheral parts that are moved away from the center of rotation of the cooling fan 15 when viewed from the front, the cooling effect can be improved.

[0034] based on Figure 6 The configuration and structure of the urea tank 22 are described.

[0035] The base plate 7 forms the floor portion of the front part of the engine hood space. A hole 7a is provided on the base plate 7, and a housing 21 is installed in the hole 7a. The urea tank 22 and the supply module 23 fall into the housing 21. Furthermore, the supply module 23 is positioned slightly to the left or right of the engine body center.

[0036] The configuration and structure of the waste gas treatment device 30 will be described. For example... Figure 6 As shown, the DOC (Diesel Oxidation Catalyst) 31 is roughly cylindrical in shape and is positioned at the upper rear of the engine E, with its length oriented horizontally. The SCR (Selective Catalytic Reduction) 34 is cylindrical and positioned vertically along the side of the engine E. An exhaust pipe 35 is mounted on the upper surface of the SCR 34. A connecting pipe 33 connects the DOC 31 and the SCR 34. The upstream side of the connecting pipe 33 connects the DOC 31 and the injection module 32, while the downstream side connects the SCR 34.

[0037] The exhaust gas treatment device 30 discharges the exhaust gas from the engine E in a purified state, removing impurities. The restricted exhaust gas components, oxidized by DOC 31, pass through the connecting pipe 33. Upstream of the connecting pipe 33, urea solution supplied from the urea tank 22 via the supply module 23 is injected by the injection module 32 and delivered to the SCR 34, located downstream of the connecting pipe 33 and near the engine E. An exhaust pipe 35, which guides the exhaust gas outwards, is connected to the exhaust port formed at the upper part of the SCR 34.

[0038] based on Figure 9 The configuration structure of the urea tank 22 and the supply module 23 is described.

[0039] The system includes a supply module 23 that pressurizes urea solution to the injection module 32 and a urea tank 22 for storing the urea solution supplied to the supply module 23. The urea tank 22 consists of a side portion 22b and an upper portion 22a that protrudes from the upper part of the side portion 22b. The supply module 23 is arranged such that its side and upper surfaces are covered by the urea tank 22.

[0040] The urea tank 22 has a urea water supply port 22c on the upper surface of the upper part 22a, which is connected to the supply module 23 via a flexible first hose 22e and a second hose 22g. The supply port 22c is positioned slightly to the left or right relative to the center of the machine body. Each hose consists of a first hose 22e supplying urea water from the urea tank 22 to the supply module 23, a third hose 22f supplying urea water from the supply module 23 to the exhaust gas treatment device 30, and a second hose 22g for returning any remaining urea water to the urea tank 22 during pressurized urea water delivery.

[0041] According to the above structure, the urea tank 22 can be positioned at the front of the engine block, thus avoiding the influence of heat exhaust from the engine E. Furthermore, by positioning the supply port 22c above the base plate 7 and offset from the center of the engine block, it avoids the counterweight mounting section 17, facilitating urea supply from the side. Moreover, by offsetting the supply port 22c and the urea tank hose connection section 22i to the left and right respectively, and by configuring the upper end of the urea tank 22 to be below the height of the upper end of the radiator 9, and by arranging the side of the engine ECU 14 facing forward with its length pointing vertically, a structure that does not obstruct airflow from the front of the engine hood 1 is created. Therefore, the airflow of cooling air is improved, allowing for efficient air delivery to the radiator 9, thereby enhancing cooling performance. Furthermore, since the urea tank 22 can be positioned near the supply module 23, the hose can be shortened compared to a more distant placement, thus reducing costs.

[0042] based on Figures 7-8 The storage unit 21 will be described.

[0043] The housing 21 is disposed in the hole 7a of the substrate 7. In addition, the housing 21 as a whole can be detached from the substrate 7 together with the urea tank 22 and the supply module 23. A first hole 21f and a second hole 21g are provided on the bottom surface 21e, located below the urea tank 22 and the supply module 23.

[0044] These structures protect the urea tank 22 and supply module 23 from mud, stones, and other debris when used in fields. Furthermore, the bottom of the urea tank 22 has a drain plug 22h for discharging urea solution, and a first hole 21f is provided on the bottom surface 21e opposite to the drain plug 22h, allowing for easy discharge of urea solution without removing the urea tank 22 from the housing 21.

[0045] The supply module 23 has a filter replacement part 23a for replacing the filter on the lower part of the bottom surface. A second hole 21g is provided on the bottom part 21e opposite to the filter replacement part 23a, so that the filter can be easily replaced without removing the supply module 23 from the housing 21.

[0046] Within the housing 21, an opening 21h and a notch 21i are provided on the wall near the supply module hose connection 23b and the wire harness connection 23c. Based on this structure, the connection and disconnection of the hoses 22e, 22f, 22g connected to the supply module 23, as well as the wire harness terminals for transmitting power and signals, can be easily performed.

[0047] By arranging the urea tank 22 close to the supply module 23, the length of the hose can be shortened.

[0048] By setting the urea tank 22 to cover the side and top surface of the supply module 23, the supply module 23 will not be exposed from the hole 7a of the base plate 7, thus not obstructing the air supplied from the front of the engine hood 1 to the radiator 9.

[0049] By setting the supply port 22c to the left or right side relative to the center of the body, water can be easily supplied from the left or right sides of the body.

[0050] Label Explanation

[0051] T Tractor

[0052] E engine

[0053] 7 substrate

[0054] 7a Hole

[0055] 21 storage units

[0056] 22 Urea Water Tank

[0057] 22c supply port

[0058] 23 Supply Module

[0059] 30 Waste Gas Treatment Device

Claims

1. A work vehicle, comprising: an exhaust gas treatment device; and a urea water tank for receiving urea water supplied to the exhaust gas treatment device, characterized in that, A radiator is installed between the engine and the urea tank.

2. The working vehicle according to claim 1, characterized in that, A base plate serving as a floor is provided in front of the radiator. The substrate has holes. A receiving body is provided downward from the hole in the substrate. The operating vehicle is equipped with a supply module that supplies urea solution to the exhaust gas treatment device. The supply module and the urea tank are housed together in the housing.

3. The operating vehicle according to claim 1 or 2, characterized in that, The urea water supply port for replenishing urea water to the urea water tank is located inside the engine hood, at a position slightly off to the left or right of the vehicle's center.

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