Work vehicle

Abstract

Provided is a work vehicle with which space can be saved.　The present invention comprises: an exhaust gas purification device 40 that purifies exhaust gas discharged from an engine 3; an intercooler 25 that cools compressed air supplied to the engine 3; and cooler connection piping 27 that at least partially overlaps the exhaust gas purification device 40 in a side view and connects the engine 3 and the intercooler 25. The exhaust gas purification device 40 has a DPF case 41a that collects particulate matter in the exhaust gas discharged from the engine 3, and an SCR case 42a that purifies nitrogen oxide in the exhaust gas. At least a portion of the cooler connection piping 27 overlaps the DPF case 41a and the SCR case 42a in a side view.

Description

Work vehicle

[0001] The present invention relates to the technology of work vehicles.

[0002] Conventionally, the technology of work vehicles equipped with an exhaust gas purification device, an intercooler, etc. is well-known. For example, it is as described in Patent Document 1.

[0003] The tractor described in Patent Document 1 includes a DPF, a radiator, an intercooler, a relay pipe, etc. The DPF is arranged with its longitudinal direction facing the front-rear direction. The radiator is arranged on the front side of the DPF. The intercooler is arranged on the front side of the radiator. The relay pipe connects the engine and the intercooler. The relay pipe extends rearward from the intercooler, passes above the radiator, and extends downward between the radiator and the DPF. The relay pipe extends rearward at a position lower than the DPF and is connected to the engine. In this way, the relay pipe is arranged so as to bypass the DPF.

[0004] As in Patent Document 1, since piping such as a relay pipe needs to be arranged so as to bypass peripheral devices (such as a DPF), the space required for installation tends to be large. Therefore, a technology that can efficiently arrange the relay pipe, etc. (aiming for space saving) is desired.

[0005] Japanese Patent Publication No. 6438341

[0006] One aspect of the present disclosure has been made in view of the above situation, and the problem to be solved is to provide a work vehicle capable of achieving space saving.

[0007] The problem to be solved by one aspect of the present disclosure is as described above. Next, the means for solving this problem will be described.

[0008] In one embodiment of this disclosure, the system comprises an exhaust gas purification device for purifying exhaust gases discharged from an engine, an intercooler for cooling compressed air supplied to the engine, and cooler connection piping that at least partially overlaps with the exhaust gas purification device in a side view and connects the engine and the intercooler. According to one embodiment of this disclosure, space can be saved.

[0009] In one embodiment of the present disclosure, the exhaust gas purification device includes a first case for collecting particulate matter in the exhaust gas discharged from the engine and a second case for purifying nitrogen oxides in the exhaust gas, and at least a portion of the cooler connection piping overlaps with the first case and the second case in a side view. According to one embodiment of the present disclosure, the first case, the second case and the cooler connection piping can be arranged in a vertically compact arrangement, thereby saving space.

[0010] In one embodiment of this disclosure, the portion of the cooler connection piping that overlaps with the first case and the second case in a side view, and the portion of the first case and the second case that overlaps with the engine in a top view. According to one embodiment of this disclosure, the front-to-back and left-to-right space required for installing the first case, etc., can be reduced, thereby saving space.

[0011] In one embodiment of this disclosure, at least a portion of the cooler connection piping overlaps with the engine in a top view and a side view. According to one embodiment of this disclosure, space can be saved.

[0012] In one embodiment of this disclosure, the first case and the second case are arranged with their longitudinal directions facing front to back and side to side in the left to right direction. According to one embodiment of this disclosure, space can be saved.

[0013] In one embodiment of the present disclosure, the portion of the cooler connection piping that overlaps with the first case and the second case in a side view is arranged in the left-right direction between the axis of the first case and the axis of the second case along the longitudinal direction. According to one embodiment of the present disclosure, the cooler connection piping can be arranged by utilizing the left and right space between the first case and the second case, thereby saving space.

[0014] In one embodiment of the present disclosure, a recess is formed in at least one of the first or second case, and the cooler connection piping is arranged to pass through the recess. According to one embodiment of the present disclosure, the recess provides space for installing the cooler connection piping, thus enabling space saving.

[0015] According to one aspect of this disclosure, space can be saved.

[0016] A side view showing the left side of a tractor according to one aspect of this disclosure. A side view showing the right side of the tractor. A side view showing the equipment inside the bonnet. A front view of the same. An enlarged side view showing the oil cooler, condenser, and sliding mechanism. An enlarged side cross-sectional view of the same. A side view showing the positional relationship between the oil cooler, etc., and the front wheels. A side view showing the exhaust gas purification device and support members, etc. A plan view of the same. (a) A plan view showing the exhaust gas purification device and various sensors. (b) A side view showing the DPF and various sensors. (c) A cross-sectional view of A1-A1 in Figure 10(a). (a) A plan view showing the support members and pivot points. (b) A perspective view of the same. (a) A side view showing the radiator, DPF, and cooler connection piping, etc. (b) A cross-sectional view of A2-A2 in Figure 12(a). (a) A plan view showing the exhaust gas purification device and cooler connection piping, etc. (b) A bottom view of the same. A3-A3 cross-sectional view in Figure 13(b). Side view showing various components located in the lower right of the cabin. Front view of the cover component cut along line A4-A4 in Figure 15. (a) Side view showing the fuel tank and urea water tank, etc. (b) Side cross-sectional view, similarly. A6-A6 cross-sectional view in Figure 17. Plan view showing the fuel tank, urea water tank and urea water pump. (b) Rear view of the fuel tank cut along line A7-A7 shown in Figure 19(a). A5-A5 cross-sectional view in Figure 15.

[0017] In the following explanation, the directions indicated by arrows U, D, F, B, L, and R in the diagram will be defined as upward, downward, forward, backward, left, and right, respectively.

[0018] First, the overall configuration of a tractor 1, which is a work vehicle according to one aspect of this disclosure, will be described. As shown in Figures 1 and 2, the tractor 1 mainly comprises a machine frame 2, an engine 3, a bonnet 4, a flywheel housing 5, a clutch housing 6, a transmission case 7, front wheels 8, rear wheels 9, fenders 10, a lifting device 11, a cabin 12, etc.

[0019] The machine frame 2 is composed of a cast part, which is a part made of casting, and a predetermined sheet metal for fixing a predetermined member to the cast part. The configuration of the machine frame 2 is not limited to this embodiment. The machine frame 2 may be formed in the shape of a frame made by appropriately combining a plurality of sheet metal materials. The machine frame 2 is positioned at the front of the tractor 1 with its longitudinal direction facing the front-rear direction. The engine 3 is fixed to the rear of the machine frame 2. The engine 3 is covered by a bonnet 4. The bonnet 4 is formed in the shape of a roughly box with openings at the bottom and rear. The machine frame 2 and the bonnet 4 form an engine room R in which the engine 3 and cooling equipment such as a radiator 22 (described later) are arranged (see Figure 3). A flywheel housing 5, a clutch housing 6, and a transmission case 7 are provided at the rear of the engine 3.

[0020] The flywheel housing 5 houses the flywheel (not shown). The clutch housing 6 is located behind the flywheel housing 5. The clutch housing 6 houses the transmission and clutch (not shown) that transmit power from the engine 3. The transmission case 7 is located behind the clutch housing 6. The transmission case 7 houses the transmission (not shown).

[0021] The front of the aircraft frame 2 is supported by a pair of front wheels 8 via a front axle mechanism (not shown). The rear of the transmission case 7 is supported by a pair of rear wheels 9 via a rear axle mechanism (not shown). The pair of rear wheels 9 are generally covered from above by fenders 10.

[0022] A lifting device 11 is provided at the rear of the transmission case 7. Various types of work equipment (for example, a tiller, etc.) can be attached to the lifting device 11. The lifting device 11 can raise and lower the attached work equipment using an actuator such as a hydraulic cylinder.

[0023] The power from engine 3 is shifted by a transmission (not shown) housed in the transmission case 7, and then transmitted to the front axle mechanism, and can also be transmitted to the front wheels 8 via the front axle mechanism. The power shifted by the transmission can also be transmitted to the rear wheels 9 via the rear axle mechanism. In this way, the power from engine 3 rotates the front wheels 8 and the rear wheels 9, allowing the tractor 1 to move. The power from engine 3 can also drive the work equipment mounted on the lifting device 11.

[0024] A cabin 12 is provided behind the engine 3 and hood 4. The front part of the cabin 12 is mounted on the vehicle body (transmission case 7, etc.) via a cabin support member 13. The rear part of the cabin 12 is mounted on the vehicle body via a predetermined member (not shown). Inside the cabin 12, an interior space is formed where an occupant sits. An air conditioning unit 16 is provided on the roof of the cabin 12, and the temperature of the interior space can be adjusted by the operation of the air conditioning unit 16.

[0025] The interior space includes a driver's seat 14 for the passenger to sit in. A steering wheel 15 for adjusting the steering angle of the front wheels 8 is located at the front of the cabin 12. A relatively large number of controls, such as a main gear lever and a sub-gear lever, are located on the right side of the cabin 12. Below the front right of the cabin 12 are a fuel tank 17 for storing fuel, a urea water tank 18 for storing urea water, and a urea water pump 19 for supplying urea water from the urea water tank 18 to an exhaust gas purification device 40 (see Figure 3), which will be described later. The fuel tank 17 and other components are supported by a support base 20, which will be described later. Figure 2 schematically shows the fuel tank 17, urea water tank 18, etc. Although not shown, another fuel tank 17 is also located below the lower left side of the cabin 12.

[0026] Next, the arrangement of each component inside the bonnet 4 (engine room R) will be explained using Figures 3 to 7. As shown in Figure 3, the engine 3, supercharger 21, radiator 22, oil cooler 23, condenser 24, intercooler 25, and exhaust gas purification device 40 are arranged inside the bonnet 4.

[0027] Engine 3 is located at the rear of the engine room R. Engine 3 is supported by the aircraft frame 2. Engine 3 has a cylinder block and a cylinder head (not shown). The upper part of engine 3 is made up of a head cover 3a that covers the cylinder head. A blister pipe 3d, which is connected to an air cleaner (not shown), is attached to the head cover 3a (see Figure 8). The gas inside engine 3 is discharged to the outside of engine 3 via the blister pipe 3d, thereby maintaining the pressure inside engine 3 appropriately.

[0028] The engine 3 is equipped with a shaft 3b that protrudes forward, and a cooling fan 3c fixed to the shaft 3b. The engine 3 can drive the cooling fan 3c by rotating the shaft 3b. When the cooling fan 3c is driven, air in front of the cooling fan 3c is drawn in and sent to the rear.

[0029] The supercharger 21 supplies compressed air to the engine 3. The supercharger 21 is mounted on the left side of the engine 3. Exhaust gas flows into the supercharger 21 from the engine 3. The supercharger 21 compresses the air by rotating a turbine with the incoming exhaust gas. This compressed air is then sent to the intercooler 25, which will be described later.

[0030] The radiator 22 cools the coolant of the engine 3. The radiator 22 is positioned in front of the engine 3 (overlapping in a front view). The radiator 22 is fixed to the vehicle body. The radiator 22 is connected to the engine 3 via radiator connection piping 26 so that coolant circulates between the radiator 22 and the engine 3. Although Figure 3 schematically shows one radiator connection piping 26 for ease of explanation, in reality, two radiator connection piping 26 are connected to the radiator 22 and the engine 3. The radiator 22 comprises a fan shroud 22a and a core 22b.

[0031] The fan shroud 22a guides air toward the cooling fan 3c. The fan shroud 22a is formed to surround the cooling fan 3c from the outer periphery. The core 22b performs heat exchange between the coolant of the engine 3 and the air circulating in the engine compartment R. The core 22b is located in front of the fan shroud 22a. When the cooling fan 3c is driven, air passes from the front to the rear of the core 22b. At this time, the radiator 22 cools the coolant by exchanging heat between the air and the coolant.

[0032] The oil cooler 23 cools the oil. The oil cooler 23 is formed in a roughly rectangular shape when viewed from the front. The oil cooler 23 is positioned in front of the radiator 22. The oil cooler 23 is connected to the hydraulic equipment via tubes through which the oil flows (not shown). When the cooling fan 3c is driven, air passes from the front to the rear of the oil cooler 23. In this process, the oil cooler 23 cools the oil by exchanging heat between the air and the oil. This oil is supplied to the hydraulic equipment via the aforementioned tubes.

[0033] The condenser 24 cools the refrigerant in the air conditioning unit 16. The condenser 24 is formed in a roughly rectangular shape when viewed from the front (see Figure 4). The condenser 24 is positioned in front of the oil cooler 23. The condenser 24 is connected to the air conditioning unit 16 via piping through which the refrigerant flows (not shown). When the cooling fan 3c is driven, air passes from the front to the back of the condenser 24. At this time, the condenser 24 cools the refrigerant by exchanging heat between the air and the refrigerant. Because the condenser 24 is positioned in front of the oil cooler 23, the refrigerant can be efficiently cooled before heat exchange takes place in the oil cooler 23. The refrigerant cooled by the condenser 24 is supplied to the air conditioning unit 16 via the aforementioned piping.

[0034] The intercooler 25 cools the compressed air supplied to the engine 3. The condenser 24 is formed in a roughly rectangular shape when viewed from the front (see Figure 4). The intercooler 25 is fixed to the vehicle body and is positioned in front of the condenser 24. The lower end of the intercooler 25 is positioned lower than the lower ends of the oil cooler 23 and the condenser 24. The intercooler 25 is connected to the engine 3 and the supercharger 21 via cooler connection piping 27. Although Figure 3 schematically shows one cooler connection piping 27 for ease of explanation, in reality, the engine 3 and supercharger 21 are connected to the intercooler 25 by two cooler connection piping 27.

[0035] Compressed air from the supercharger 21 flows into the intercooler 25 via the cooler connection pipe 27. When the cooling fan 3c is driven, air passes from the front to the rear of the intercooler 25. The intercooler 25 cools the compressed air by exchanging heat between this air and the compressed air. Since the intercooler 25 is positioned in front of the condenser 24, it can efficiently cool the compressed air before heat exchange occurs in the condenser 24. The compressed air cooled by the intercooler 25 is supplied to the engine 3 via the cooler connection pipe 27.

[0036] The exhaust gas purification device 40 purifies the exhaust gas emitted from the engine 3. The exhaust gas purification device 40 will be described later.

[0037] As shown in Figure 4, the left-right width W25 (width along the left-right direction) of the intercooler 25 is smaller than the left-right width W23 of the oil cooler 23, the left-right width W24 of the condenser 24, and the left-right width W22 of the radiator 22. The left-right width W23 of the oil cooler 23 is about the same width as the left-right width W24 of the condenser 24. The left-right widths W23 and W24 of the condenser 24 and the oil cooler 23 are smaller than the left-right width W22 of the radiator 22. In this embodiment, the left-right width W22 of the radiator 22 is the left-right width of the fan shroud 22a.

[0038] In this embodiment, the oil cooler 23 and condenser 24 are positioned between the radiator 22, which has the largest left-right width W22, and the intercooler 25, which has the smallest left-right width W25. The oil cooler 23 and condenser 24 (multiple cooling devices) are configured to slide relative to the vehicle body.

[0039] Figures 5 and 6 show an example of the configuration of a sliding mechanism 30 for sliding the oil cooler 23 and the like. The sliding mechanism 30 will be described in detail below. The sliding mechanism 30 comprises an upper rail 31, a first lower rail 32, a second lower rail 33, a first sliding part 34, and a second sliding part 35.

[0040] The upper rail 31 guides the oil cooler 23 and condenser 24 in the left-right direction. The upper rail 31 is formed in an elongated shape that extends to the left and right. The upper rail 31 is positioned above the oil cooler 23 (overlapping in a plan view). The upper rail 31 has an outer member 31a and an inner member 31b. The outer member 31a is formed in a shape with an opening at the bottom (an inverted U-shape in a side view in Figures 5 and 6). The inner member 31b is positioned inside the outer member 31a. Gaps are formed between the front of the outer member 31a and the front of the inner member 31b, and between the rear of the outer member 31a and the rear of the inner member 31b.

[0041] The first lower rail 32 guides the oil cooler 23 in the left-right direction. The first lower rail 32 is positioned below the oil cooler 23. The second lower rail 33 guides the condenser 24 in the left-right direction. The second lower rail 33 is positioned below the condenser 24. The upper rail 31, the first lower rail 32, and the second lower rail 33 are fixed to the vehicle body.

[0042] The first sliding portion 34 is the part that slides against the upper rail 31 and the first lower rail 32. The first sliding portion 34 is fixed to both the upper and lower ends of the oil cooler 23. The upper first sliding portion 34 is formed so that a part of it (the rear part in Figures 5 and 6) protrudes upward. This protruding portion is positioned in the gap between the rear of the outer member 31a and the rear of the inner member 31b. This allows the upper first sliding portion 34 to slide in the left-right direction relative to the upper rail 31. The lower first sliding portion 34 is attached to the first lower rail 32 so as to sandwich it from the front and rear. This allows the lower first sliding portion 34 to slide in the left-right direction relative to the first lower rail 32.

[0043] The second sliding portion 35 is the part that slides against the upper rail 31 and the second lower rail 33. The second sliding portion 35 is fixed to both the upper and lower ends of the capacitor 24. A part of the upper second sliding portion 35 (the rear part in Figures 5 and 6) is formed to protrude upward. This protruding portion is positioned in the gap between the front part of the outer member 31a and the front part of the inner member 31b. This allows the upper second sliding portion 35 to slide in the left-right direction relative to the upper rail 31. The lower part of the lower first sliding portion 34 is attached to the second lower rail 33 so as to sandwich it from the front and rear. This allows the lower second sliding portion 35 to slide in the left-right direction relative to the second lower rail 33.

[0044] The oil cooler 23 can be guided by the upper rail 31 or the like and slide in the left - right direction by the sliding of the first sliding portion 34 with respect to the upper rail 31 and the first lower rail 32. Further, the capacitor 24 can be guided by the upper rail 31 or the like and slide in the left - right direction by the sliding of the second sliding portion 35 with respect to the upper rail 31 and the second lower rail 33.

[0045] When the operator performs maintenance on the oil cooler 23 and the capacitor 24, the oil cooler 23 or the like can be slid to a position where maintenance is easy. For example, the oil cooler 23 or the like can be slid to the left of the inter - cooler 25.

[0046] Also, when the operator performs maintenance on the radiator 22 and the inter - cooler 25 fixed to the vehicle body, the oil cooler 23 and the capacitor 24 can be slid so as not to interfere with the maintenance. Thus, by sliding the oil cooler 23 and the capacitor 24, which are a plurality of cooling devices arranged in series in the front - rear direction in front of the radiator 22, a working space for the maintenance of the radiator 22 or the like can be secured.

[0047] Therefore, even if the radiator 22, the oil cooler 23, the capacitor 24, and the inter - cooler 25 are arranged closely in the front - rear direction, it is possible to suppress the difficulty of maintaining the radiator 22, the oil cooler 23, or the like. Also, by arranging the radiator 22 or the like closely in the front - rear direction, the overall length (front - rear length) of the bonnet 4 can be shortened. As a result, the visibility in front of the tractor 1 can be improved, and the tractor 1 can be easily turned even in a relatively narrow place.

[0048] Also, in the present embodiment, gripping portions 23a and 24a are provided on the left and right outer surfaces (left side surface in FIG. 5) of the oil cooler 23 and the capacitor 24. The gripping portions 23a and 24a are formed in a shape that is easy for an operator to grip. By these gripping portions 23a and 24a, it is possible to make the oil cooler 23 and the like slide easily. Note that in the drawings other than FIGS. 4 and 5, the description of the gripping portions 23a and 24a is omitted.

[0049] Note that the configuration of the slide mechanism 30 shown in FIGS. 5 and 6 is an example, and it is also possible to slide the oil cooler 23 and the capacitor 24 with a configuration different from the configuration shown in FIGS. 5 and 6. For example, in the above-described example, the oil cooler 23 and the capacitor 24 are slid by the common upper rail 31, but it is also possible to arrange rails above the oil cooler 23 and the like respectively and slide the oil cooler 23 and the like by separate rails. Further, it is also possible to arrange rails on the left and right outer sides of the oil cooler 23 and the like and slide the oil cooler 23 and the like in the vertical direction.

[0050] FIG. 7 is a side view showing the positional relationship between the radiator 22, the oil cooler 23, the capacitor 24, the intercooler 25, and the front wheel 8. Hereinafter, referring to FIG. 7, the positional relationship between the radiator 22 and the like and the front wheel 8 will be described.

[0051] The radiator 22 is arranged above the axle 8a of the front wheel 8 (the axle provided at both left and right ends of the front axle mechanism) in a side view. The front and rear positions (positions in the front and rear direction) of the radiator 22 overlap with the front and rear positions of the axle 8a. In the present embodiment, the front and rear positions of the radiator 22 overlap with the front and rear positions of the axis center of the axle 8a. By arranging the front and rear positions of the radiator 22 to overlap with the front and rear positions of the axle 8a in this way, even if the cut angle of the front wheel 8 is increased, it is possible to make it difficult for the front wheel 8 to approach the radiator 22 (suppress interference).

[0052] The oil cooler 23 and condenser 24 are positioned higher than the front wheel 8. More specifically, in a side view, the lower end of the oil cooler 23, etc., is positioned above the outer circumference of the front wheel 8. In this way, the oil cooler 23 and condenser 24 in this embodiment are positioned outside the front wheel 8 in a side view. With this configuration, even if the steering angle of the front wheel 8 is increased, it is possible to prevent the front wheel 8 from interfering with the oil cooler 23, etc. Furthermore, it is possible to make it less likely for the front wheel 8 to get in the way when sliding the oil cooler 23, etc. in the left-right direction (making it easier to slide).

[0053] As described above, the lower end of the intercooler 25 is positioned lower than the lower ends of the oil cooler 23 and the condenser 24. The lower end of the intercooler 25 is positioned between the left and right front wheels 8. In this way, at least a portion of the intercooler 25 in this embodiment is positioned so as to overlap with the front wheels 8 in a side view. This configuration allows for effective use of the space between the left and right front wheels 8. Furthermore, because the width W25 of the intercooler 25 is relatively small (see Figure 4), interference between the front wheels 8 and the intercooler 25 can be suppressed even when the steering angle of the front wheels 8 is increased.

[0054] The positional relationship between the radiator 22, etc. and the front wheel 8 described above is just one example, and can be changed as appropriate depending on the size and arrangement of the radiator 22, etc.

[0055] The exhaust gas purification device 40 will be described below with reference to Figures 3, 8 to 10, 13, and 14. As shown in Figures 3 and 8, the exhaust gas purification device 40 is located behind the radiator 22 and above the engine 3. As shown in Figure 9, the exhaust gas purification device 40 comprises a DPF 41, an SCR 42, an inlet pipe 43, a connecting pipe 44, an exhaust pipe 45, and a urea water supply unit 46.

[0056] The DPF (Diesel Particulate Filter) 41 collects particulate matter (PM) in the exhaust gas discharged from the engine 3. The DPF 41 has a hollow, substantially cylindrical DPF case 41a. A filter (not shown) for collecting PM is provided inside the DPF case 41a. The DPF case 41a is positioned with its longitudinal direction facing the front-rear direction. As shown in Figure 10, the DPF case 41a has a first left recess 41b, a second left recess 41c, an upper recess 41d, and a lower recess 41e. Figure 10(c) is a cross-sectional view taken along line A1-A1 in Figure 10(a), but for the sake of explanation, the radiator 22 and radiator connecting pipe 26 are also shown.

[0057] The first left recess 41b shown in Figure 10(a) is formed at the left rear end of the DPF case 41a. The second left recess 41c is formed at the left front end of the DPF case 41a. The first left recess 41b and the second left recess 41c are formed so that the outer circumferential surface of the DPF case 41a is recessed inward (to the right) on both sides.

[0058] The upper recess 41d shown in Figure 10(c) is formed at the front upper end of the DPF case 41a. The upper recess 41d is formed in a shape where the front upper end of the DPF case 41a is recessed toward the rear. The lower recess 41e shown in Figure 10(c) is formed at the front lower end of the DPF case 41a (below the upper recess 41d). The lower recess 41e is formed in a shape where the front lower end of the DPF case 41a is recessed toward the rear and upward. In addition, an inclined surface 41f that slopes downward toward the rear (facing downward toward the front) is formed in the lower recess 41e.

[0059] The Selective Catalytic Reduction (SCR) 42 shown in Figure 10(a) purifies nitrogen oxides in exhaust gas. The SCR 42 has a hollow, substantially cylindrical SCR case 42a. A catalyst (not shown) for purifying nitrogen oxides is provided inside the SCR case 42a. The SCR case 42a is positioned with its longitudinal direction facing the front-to-back direction. As shown in Figures 13 and 14, the SCR case 42a has a recess 42b.

[0060] The recess 42b is formed at the front lower end of the SCR case 42a. The recess 42b is formed in such a way that the front lower end of the SCR case 42a is recessed upwards.

[0061] As described above, the DPF case 41a and SCR case 42a are arranged with their longitudinal direction facing the front-to-back direction (see Figure 9). This makes it possible to relatively reduce the lateral space required to install the DPF case 41a and SCR case 42a (space saving). In addition, by reducing the lateral space, the width of the bonnet 4 can be reduced. This makes it easier to check the position of the work equipment and front wheels 8 attached to the front of the tractor 1 (improving visibility).

[0062] As shown in Figure 9, the SCR case 42a is positioned to the right of the DPF case 41a (overlapping in a side view). In this way, the DPF case 41a and the SCR case 42a in this embodiment are positioned side by side in the left-right direction. This allows the height positions of the DPF case 41a and the SCR case 42a to be aligned, thereby reducing the vertical space required to install the DPF case 41a and the SCR case 42a (saving space). In addition, by reducing the vertical space, the height of the bonnet 4 can be lowered, improving the visibility for the worker (driver) from the driver's seat 14.

[0063] Furthermore, the exhaust gas purification device 40 is positioned to fit within the left-right width W22 of the fan shroud 22a of the radiator 22. More specifically, the exhaust gas purification device 40, specifically the equipment that purifies exhaust gas (DPF 41 and SCR 42), is positioned to fit within the left-right width W22. In this embodiment, the exhaust gas purification device 40 is positioned such that the left end of the DPF 41a is located to the right (inward on both sides of the vehicle body) of the left end of the fan shroud 22a, and the right end of the SCR case 42a is located to the left (inward on both sides of the vehicle body) of the right end of the fan shroud 22a.

[0064] By fitting the exhaust gas purification device 40 into the left-right width W22 of the fan shroud 22a in this way, the left-right space required to install the exhaust gas purification device 40 (DPF case 41a, etc.) can be reduced.

[0065] The arrangement of the DPF case 41a and SCR case 42a in this embodiment is merely an example and can be changed as appropriate. For example, although the SCR case 42a is positioned to the right of the DPF case 41a, the left-right positional relationship between the DPF case 41a and the SCR case 42a may be reversed. Also, although the DPF case 41a and the like are positioned with their longitudinal direction facing the front-to-back direction, the orientation of the longitudinal direction of the DPF case 41a and the like is not particularly limited. For example, the DPF case 41a and the like may be positioned with their longitudinal direction inclined with respect to the front-to-back direction.

[0066] The inlet pipe 43 guides the exhaust gas to the DPF case 41a. The inlet pipe 43 is connected to the bottom (rear lower end) of the DPF case 41a and the turbocharger 21 (see Figure 3). The inlet pipe 43 does not necessarily have to be connected to the bottom of the DPF case 41a; it may be connected to other parts of the DPF case 41a. For example, the inlet pipe 43 may be connected to the side of the DPF case 41a.

[0067] The connecting pipe 44 connects the DPF case 41a and the SCR case 42a to each other. The connecting pipe 44 is connected to the front end of the DPF case 41a and the front end of the SCR case 42a, allowing exhaust gas to be guided from the DPF case 41a to the SCR case 42a. The connecting pipe 44 is positioned with its longitudinal direction oriented from left to right. The connecting pipe 44 is also connected to the approximate vertical center of the roughly cylindrical DPF case 41a and SCR case 42a, which are arranged side by side, and overlaps with the DPF case 41a and SCR case 42a in a side view (see Figure 10(b)).

[0068] Thus, in this embodiment, the DPF case 41a and the SCR case 42a are connected by the shortest possible distance, shortening the length of the connecting pipe 44. This reduces the space required to arrange the connecting pipe 44, thereby saving space. Furthermore, it prevents the connecting pipe 44 from protruding above or below the DPF case 41a and the SCR case 42a, allowing space to be secured above and below the DPF case 41a and the connecting pipe 44.

[0069] The exhaust pipe 45 discharges the exhaust gas purified by the exhaust gas purification device 40 towards the outside space. The right end of the exhaust pipe 45 is connected to the left side (left rear end) of the SCR case 42a. The exhaust pipe 45 extends to the left from the SCR case 42a and is exposed to the outside of the bonnet 4 (see Figure 1). In this embodiment, exhaust gas can be discharged from the left side of the vehicle body towards the outside space of the tractor 1 via the exhaust pipe 45. The above-described configuration of the exhaust pipe 45 (connection part to the SCR case 42a, extension direction, etc.) is an example and can be changed as appropriate. For example, the exhaust pipe 45 may be connected to the right side of the SCR case 42a and extend to the right. Alternatively, the exhaust pipe 45 may be connected to the bottom of the SCR case 42a and extend downward.

[0070] As in this embodiment, by discharging exhaust gas from the left side of the vehicle body via the exhaust pipe 45, the exhaust pipe 45 does not obstruct the view when looking at the right side of the tractor 1, thus ensuring a clear view of the right side of the tractor 1. In addition, since a relatively large number of controls, such as the main gear shift lever, are located on the right side of the tractor 1 (cabin 12), the operator often drives the tractor 1 while looking at the right side. In this embodiment, a clear view of the right side of the tractor 1 is ensured, making it easier to drive the tractor 1.

[0071] The urea water supply unit 46 shown in Figures 8 and 9 supplies urea water into the DPF case 41a. The urea water supply unit 46 has a nozzle (not shown) for spraying urea water. The urea water supply unit 46 is attached to the left front end of the DPF case 41a. In this embodiment, the urea water supply unit 46 is attached to the second left recess 41c of the DPF case 41a. By positioning the urea water supply unit 46 using the recess (second left recess 41c) of the DPF case 41a in this way, the protrusion width of the urea water supply unit 46 from the outer surface of the DPF case 41a can be reduced, thus saving space.

[0072] As shown in Figure 9, the urea water supply unit 46 is connected to the urea water tank 18. A urea water pump 19 is provided in the urea water flow path from the urea water tank 18 to the urea water supply unit 46. When the urea water pump 19 is driven, the urea water in the urea water tank 18 is pumped (supplied) to the urea water supply unit 46. This urea water is then supplied into the DPF case 41a via the urea water supply unit 46.

[0073] The following describes the exhaust gas flow path and the exhaust gas purification procedure in the exhaust gas purification device 40, with reference to Figure 9. The arrows in Figure 9 indicate the direction of exhaust gas flow.

[0074] Exhaust gas flows from the turbocharger 21 to the rear end of the DPF case 41a via the inlet pipe 43. The exhaust gas then flows forward through the DPF case 41a. At this time, PM in the exhaust gas is collected by the DPF case 41a (filter). Urea water is injected into the exhaust gas that has flowed to the front end of the DPF case 41a by the urea water supply unit 46. The urea water is hydrolyzed within the DPF case 41a to produce ammonia.

[0075] The exhaust gas and ammonia flow from the DPF case 41a to the connecting pipe 44, and then flow through the connecting pipe 44 to the right. At this time, the exhaust gas and ammonia are mixed. The exhaust gas and ammonia then flow from the connecting pipe 44 to the front end of the SCR case 42a.

[0076] Exhaust gases flow through the SCR case 42a toward the rear. During this process, nitrogen oxides and ammonia in the exhaust gases chemically react on the catalyst inside the SCR case 42a, reducing the nitrogen oxides to nitrogen and water (nitrogen oxides are purified in the SCR case 42a). In this way, the exhaust gases are purified by the exhaust gas purification device 40. The exhaust gases that have flowed through the SCR case 42a toward the rear end are discharged into the outside space via the exhaust pipe 45.

[0077] In this embodiment, the exhaust gas flow path is formed such that the exhaust gas flowing into the DPF case 41a folds back once in the front-to-back direction before flowing out from the SCR case 42a. This simplifies the exhaust gas flow path. Note that the exhaust gas flow path in this embodiment is just one example and can be modified as appropriate depending on the orientation of the DPF case 41a, etc.

[0078] In the following, with reference to Figures 8 and 11, the support members 50 that support the exhaust gas purification device 40 (DPF case 41a and SCR case 42a, etc.) will be described.

[0079] The support member 50 is constructed by appropriately combining a plurality of plate-shaped members. The support member 50 is formed in a frame shape. As shown in Figure 11, the support member 50 comprises a left-side member 51, a right-side member 52, a front-side member 53, a rear-side member 54, a heat shield plate 55, an outer member 56, a case support member 57, a sensor support member 58, and a connector fixing member 59.

[0080] The left-side member 51 is a member that forms the left part of the support member 50. The right-side member 52 is a member that forms the right part of the support member 50. The right-side member 52 is positioned to the right of the left-side member 51. The left-side member 51 and the right-side member 52 are formed in an elongated shape that extends in the front-rear direction. In this embodiment, the front-rear width of the right-side member 52 is longer than the front-rear width of the left-side member 51. Also, the rear end of the right-side member 52 is located behind the rear end of the left-side member 51 (see Figure 11).

[0081] The front member 53 is a member that forms the front part of the support member 50. The front member 53 is formed in an elongated shape that extends in the left-right direction. Both the left and right ends of the front member 53 are fixed to the front parts of the left member 51 and the right member 52.

[0082] The rear member 54 is a member that forms the rear part of the support member 50. The rear member 54 has a first extension 54a that extends in the left-right direction, and a second extension 54b that extends downward from the left end of the first extension 54a. The right end of the first extension 54a is fixed to the rear end of the right-side member 52. The second extension 54b is connected to the left-side member 51 via a heat shield 55.

[0083] The heat shield 55 shown in Figures 8 and 11 is a plate-shaped member that covers the supercharger 21. The heat shield 55 has a plate-shaped portion 55a and an extended portion 55b. The plate-shaped portion 55a is a plate-shaped part with its surface oriented in the left-right direction. The plate-shaped portion 55a is fixed to the left-side member 51 and is positioned to protrude downward from the left-side member 51.

[0084] The extension portion 55b is the part that extends from the rear end of the plate-shaped portion 55a toward the rear member 54 (to the right). The extension portion 55b is fixed to the second extension portion 54b of the rear member 54. In this way, the support member 50 is formed in a substantially rectangular ring shape (frame shape) in plan view by the left member 51, the right member 52, the front member 53, the rear member 54 and the heat shield plate 55.

[0085] The outer member 56 is a member that surrounds the left, right outer sides and top of the exhaust gas purification device 40 (DPF case 41a and SCR case 42a). As shown in Figure 11(a), the outer member 56 is positioned between the front member 53 and the rear member 54 in the front-rear direction. As shown in Figure 11(b), the outer member 56 is formed in an inverted U-shape when viewed from the front, with the opening facing downwards. The outer member 56 comprises a first longitudinal portion 56a and a second longitudinal portion 56b.

[0086] The first longitudinal portion 56a is formed in an elongated shape with its longitudinal direction oriented vertically. A pair of first longitudinal portions 56a are formed, one on the left and one on the right. The left and right first longitudinal portions 56a are fixed to the left member 51 and the right member 52, and are arranged to protrude upward from the left member 51 and the right member 52. The second longitudinal portion 56b is formed in an elongated shape with its longitudinal direction oriented horizontally. The second longitudinal portion 56b is formed to connect the upper ends of the left and right first longitudinal portions 56a. The second longitudinal portion 56b is provided with a pivot point 70 that serves as the pivot point for the bonnet 4. The pivot point 70 will be described later.

[0087] The case support member 57 supports the DPF case 41a and the SCR case 42a. The case support member 57 is formed in a plate shape and is fixed to the left member 51, the right member 52, the front member 53, and the rear member 54, respectively. The case support member 57 is also positioned to protrude upward from the left member 51, etc.

[0088] The sensor support member 58 shown in Figure 8 supports the temperature sensor 64, which will be described later. The sensor support member 58 is formed in a plate shape with its plate surface oriented in the left-right direction. The sensor support member 58 is attached to the case support member 57, which is fixed to the left-side member 51, and to the outer member 56, and is positioned on the left side of the DPF case 41a. Note that in Figure 11, the sensor support member 58 is omitted for the sake of explanation.

[0089] In this embodiment, the support member 50 is fixed to the engine 3. More specifically, the left-side member 51 is fixed to the upper part of the left side of the engine 3. The right-side member 52 shown in Figure 11 is fixed to the upper part of the right side of the engine 3. The front-side member 53 is fixed to the upper part of the front side of the engine 3. The rear-side member 54 is fixed to the upper part of the rear side of the engine 3.

[0090] Thus, the support member 50 is formed in a frame shape that surrounds the upper part of the engine 3 from the outside in the horizontal direction. The support member 50 is positioned lower than the upper end of the head cover 3a of the engine 3 shown in Figure 8. More specifically, the upper ends of the various members of the support member 50 that form the frame (left member 51, right member 52, etc.) are positioned lower than the upper end of the head cover 3a. This allows the support member 50 to be positioned vertically closer to the engine 3 (lowering the height of the support member 50). As a result, space can be saved. In addition, by lowering the height of the exhaust gas purification device 40 in conjunction with positioning the support member 50 vertically closer to the engine 3, the height of the bonnet 4 can be lowered.

[0091] Furthermore, the plate-shaped portion 55a of the heat shield 55 is positioned to the left of the supercharger 21. In this way, the plate-shaped portion 55a covers the supercharger 21 from both the left and right outer sides. This suppresses the transfer of heat from the supercharger 21 to other components.

[0092] Furthermore, the left-side member 51 overlaps with a portion of the blister pipe 3d connected to the head cover 3a in a side view. By positioning the left-side member 51 and the blister pipe 3d relatively close together in this way, heat transferred from the engine 3 to the left-side member 51 can be more easily transferred to the blister pipe 3d. This helps to suppress freezing of the blister pipe 3d.

[0093] The positional relationship between the left-side member 51 and the blazer pipe 3d described above is just one example and can be changed as appropriate. For example, the blazer pipe 3d may be positioned above (or below) the left-side member 51.

[0094] In this embodiment, the rearmost member 54 of the support member 50 is positioned in front of the rear surface of the flywheel housing 5. By positioning the support member 50 in front of the rear surface of the flywheel housing 5, the support member 50 can be positioned relatively far forward, and space can be secured behind the support member 50. Furthermore, by effectively utilizing this space, space (for example, foot space) in the cabin 12 located behind the support member 50 can be secured.

[0095] The DPF case 41a and SCR case 42a described above are fixed to the case support member 57 of the support member 50. In this embodiment, as shown in Figures 8 and 11(b), the DPF case 41a and the like are fixed to the case support member 57 with their rear ends positioned inside the outer member 56. In this way, the DPF case 41a and the like are supported by the support member 50 above the engine 3. The outer member 56 is also positioned to surround the left, right outer sides and top of the DPF case 41a and the like.

[0096] As shown in Figure 8, the DPF case 41a and SCR case 42a are positioned in front of the rear surface of the flywheel housing 5. This allows the DPF case 41a and the like to be positioned relatively far forward, securing space behind the DPF case 41a and the like.

[0097] As shown in Figures 8 and 11(b), a connector fixing member 59 is attached to the support member 50 of this embodiment. The connector fixing member 59 is used to fix a connector 61a that connects the sensor (nitrogen oxide sensor 61 in this embodiment) to other equipment. The connector fixing member 59 is formed in a plate shape with its surface oriented in the left-right direction. The connector fixing member 59 is also formed in a rectangular shape in side view with its longitudinal direction oriented in the up-down direction.

[0098] The connector fixing member 59 is connected to the left-side member 51. In this way, the support member 50 is configured to support the connector 61a via the connector fixing member 59. Note that the reference numeral P59 in Figure 8 indicates the connection portion between the left-side member 51 and the connector fixing member 59 (for example, the portion to which a bolt or the like is attached). The connector 61a is positioned lower than the connection portion P59. This reduces the thermal impact on the connector 61a.

[0099] More specifically, the heat generated by the engine 3 and other components rises, so higher positions within the hood 4 tend to become hotter. In this embodiment, by positioning the connector 61a at a lower position (lower temperature) than the connecting portion P59, it is possible to suppress the connector 61a from becoming hot (mitigate the effects of heat).

[0100] As shown in Figure 8, in this embodiment, an opening 4a is formed on the upper surface of the bonnet 4, allowing heat to be discharged from inside the bonnet 4 to the outside space through this opening 4a. This lowers the temperature inside the bonnet 4 and mitigates the thermal impact on the connector 61a. In Figure 8, an opening 4a formed above the supercharger 21 is shown as an example, but the location where the opening 4a is formed is not limited to above the supercharger 21. For example, it is also possible to provide an opening 4a at an appropriate location on the upper surface of the bonnet 4.

[0101] Furthermore, it is possible to provide an opening 4a on the side of the hood 4 (apart from the top surface). It is also possible to provide openings 4a on both the side and the top surface of the hood 4. Even if an opening 4a is provided on the side of the hood 4, the temperature inside the hood 4 can be lowered, thereby protecting electrical components (such as the differential pressure sensor 67 described later) from heat from the engine 3, etc.

[0102] Here, the DPF case 41a and support member 50 mentioned above are fitted with sensors that acquire various information necessary for controlling the exhaust gas purification process (for example, controlling the amount of urea solution supplied). The following describes these sensors. Specifically, the nitrogen oxide sensor 61, temperature sensor 64, and differential pressure sensor 67 will be described.

[0103] The nitrogen oxide sensors 61 shown in Figures 8 and 10 detect the concentration of nitrogen oxides in exhaust gas. The nitrogen oxide sensors 61 are formed in a rod shape. The nitrogen oxide sensors 61 are connected to a connector 61a via the cable 61b shown in Figure 8 and are configured to output the nitrogen concentration detection result to an external device. The nitrogen oxide sensors 61 are installed at two locations in the exhaust gas flow path. Hereinafter, of the two nitrogen oxide sensors 61, the upstream nitrogen oxide sensor 61 will be referred to as the "first nitrogen oxide sensor 62," and the downstream nitrogen oxide sensor 61 will be referred to as the "second nitrogen oxide sensor 63."

[0104] As shown in Figure 10(c), the first nitrogen oxide sensor 62 is attached to the upper recess 41d formed at the front end of the DPF case 41a. By positioning the first nitrogen oxide sensor 62 using the recess (upper recess 41d) of the DPF case 41a in this way, the protrusion width of the first nitrogen oxide sensor 62 from the outer surface of the DPF 41 can be reduced, thereby saving space.

[0105] As shown in Figure 10(a), the second nitrogen oxide sensor 63 is attached to the exhaust pipe 45. In a plan view, the second nitrogen oxide sensor 63 is positioned to protrude from the exhaust pipe 45 toward the DPF case 41a. This allows the second nitrogen oxide sensor 63 to be positioned using the space between the DPF 41 and the exhaust pipe 45, thus saving space.

[0106] The temperature sensors 64 shown in Figures 8, 10(a), and 10(b) are used to detect the temperature of the exhaust gas. The temperature sensors 64 are installed at two locations in the exhaust gas flow path. Hereinafter, the upstream temperature sensor 64 will be referred to as the "first temperature sensor 65," and the downstream temperature sensor 64 will be referred to as the "second temperature sensor 66."

[0107] The first temperature sensor (sensor unit) 65 comprises a sensor portion 65a and a connector portion 65b. The sensor portion 65a senses temperature. The sensor portion 65a is formed in a rod shape. The sensor portion 65a is attached to the first left-side recess 41b of the DPF case 41a. This reduces the protrusion width of the sensor portion 65a from the outer circumferential surface of the DPF 41, thereby saving space.

[0108] The connector 65b shown in Figure 8 connects the ECU, which controls the operation of the tractor 1, to the sensor 65a. The connector 65b is fixed to the sensor support member 58.

[0109] The second temperature sensor (sensor unit) 66 comprises a sensor portion 66a and a connector portion 66b. The sensor portion 66a is attached to the outer circumferential surface of the DPF case 41a. The sensor portion 66a is positioned in front of the sensor portion 65a of the first temperature sensor 65. The connector portion 66b is fixed to the sensor support member 58. Thus, in this embodiment, the exhaust gas purification device 40 and the temperature sensor 64 (connector portion 65b) are supported by a common member (support member 50).

[0110] The differential pressure sensor 67 detects the differential pressure of the exhaust gas between two points in the exhaust gas flow path. The differential pressure sensor 67 is fixed to the front and rear of the DPF case 41a via a predetermined member. The first connecting pipe 67a and the second connecting pipe 67b are connected to the differential pressure sensor 67.

[0111] As shown in Figures 10(a) and 10(b), the rear end of the first connecting pipe 67a is attached to the rear of the DPF case 41a (behind the differential pressure sensor 67). The front end of the first connecting pipe 67a is attached to the differential pressure sensor 67. The first connecting pipe 67a can guide exhaust gas from the rear end of the DPF case 41a to the differential pressure sensor 67. Hereinafter, the portion of the first connecting pipe 67a attached to the DPF case 41a will be referred to as the "first portion 67c". The first connecting pipe 67a is positioned to extend downward (slope downwards towards the rear) as it moves from the differential pressure sensor 67 towards the first portion 67c.

[0112] The front end of the second connecting pipe 67b is attached to the front end of the DPF case 41a (in front of the differential pressure sensor 67). The rear end of the second connecting pipe 67b is attached to the differential pressure sensor 67. The second connecting pipe 67b can guide exhaust gas from the front end of the DPF case 41a to the differential pressure sensor 67. Hereinafter, the portion of the second connecting pipe 67b attached to the DPF case 41a will be referred to as the "second portion 67d".

[0113] As described above, the exhaust gas flows forward through the DPF case 41a (see Figure 9). For this reason, the second section 67d is located downstream of the first section 67c in the direction of exhaust gas flow. The second connecting pipe 67b is positioned to extend downward (slope downward) from the differential pressure sensor 67 towards the second section 67d.

[0114] The differential pressure sensor 67 detects the differential pressure between the first section 67c and the second section 67d based on the exhaust gas from the first connecting pipe 67a and the exhaust gas from the second connecting pipe 67b. For example, the differential pressure sensor 67 has a diaphragm that deforms according to the pressure of the exhaust gas from the first connecting pipe 67a and the exhaust gas from the second connecting pipe 67b, and detects the differential pressure based on the degree of deformation of the diaphragm.

[0115] In this configuration, the first connecting pipe 67a and the second connecting pipe 67b guide the exhaust gas, and in some cases, moisture contained in the exhaust gas may condense (become condensed water) inside the first connecting pipe 67a and the second connecting pipe 67b. In this embodiment, the first connecting pipe 67a and the second connecting pipe 67b extend downward from the differential pressure sensor 67 toward the first section 67c and the second section 67d. With this configuration, the condensed water from the exhaust gas can be directed away from the differential pressure sensor 67, thereby preventing the condensed water from entering the differential pressure sensor 67 and causing malfunctions.

[0116] Furthermore, the differential pressure sensor 67 is positioned between the first portion 67c and the second portion 67d in the front-rear direction. This allows the first connecting pipe 67a and the second connecting pipe 67b to extend in different directions (forward or backward) from the differential pressure sensor 67, making it easier to position the first connecting pipe 67a and the second connecting pipe 67b.

[0117] As mentioned above, the higher the position inside the bonnet 4, the hotter the temperature tends to be. Therefore, in this embodiment, the differential pressure sensor 67 is positioned so as to overlap with the DPF case 41a in a side view (see Figure 10(b)) to prevent the height of the differential pressure sensor 67 from becoming excessively high. This prevents the differential pressure sensor 67 from becoming hot and mitigates the effects of heat on the differential pressure sensor 67.

[0118] In the following, with reference to Figures 3 and 12 to 14, the positional relationships between the various components of the exhaust gas purification device 40 and the components arranged around them will be explained. First, the positional relationships between the DPF case 41a and the SCR case 42a and the cooler connection piping 27 will be explained.

[0119] As described above, the cooler connection pipe 27 connects the engine 3 and supercharger 21 to the intercooler 25 (see Figures 3 and 12(a)). Hereafter, the cooler connection pipe 27 connecting the supercharger 21 to the intercooler 25 will be referred to as the "first cooler pipe 28". The cooler connection pipe 27 connecting the engine 3 to the intercooler 25 will be referred to as the "second cooler pipe 29". As shown in Figures 12(b) and 13, the second cooler pipe 29 is located to the right of the first cooler pipe 28. Note that most of the second cooler pipe 29 overlaps with the first cooler pipe 28 in a side view, so the description of the second cooler pipe 29 is omitted in Figure 12(a).

[0120] As shown in Figure 3, in this embodiment, a radiator 22, an oil cooler 23, and a condenser 24 are arranged between the intercooler 25 and the exhaust gas purification device 40. Two cooler connection pipes 27 are arranged to pass above the condenser 24, etc. Also, as shown in Figure 12(a), the two cooler connection pipes 27 extend downward and rearward in a side view above the fan shroud 22a of the radiator 22. Hereinafter, the portion of the two cooler connection pipes 27 that extends downward and rearward will be referred to as the "first extension portion 27a". The two cooler connection pipes 27 further extend rearward in a side view from the rear lower end of the first extension portion 27a and are connected to the supercharger 21 or engine 3. Hereinafter, the portion of the two cooler connection pipes 27 that extends rearward will be referred to as the "second extension portion 27b".

[0121] As shown in Figure 12(b), the second extension 27b is positioned offset to the left and right with respect to the axis L41 of the DPF case 41a and the axis L42 of the SCR case 42a. The axis L41 of the DPF case 41a is a straight line that passes through the center of the DPF case 41a (circular cross-section) and is parallel to the longitudinal direction of the DPF case 41a when viewed from the longitudinal direction. The axis L42 of the SCR case 42a is a straight line that passes through the center of the SCR case 42a (circular cross-section) and is parallel to the longitudinal direction of the SCR case 42a when viewed from the longitudinal direction. The top of the cross-section of the second extension 27b, when viewed from the longitudinal direction, is positioned higher than the lower ends of the DPF case 41a and the SCR case 42a. Therefore, as shown in Figure 12(a), the top and surrounding portion of the second extension 27b of the cooler connection piping 27 overlap with the DPF case 41a, etc., in a side view.

[0122] By arranging the DPF case 41a and SCR case 42a (exhaust gas purification device 40) and at least a portion of the cooler connection piping 27 to overlap in a side view, the DPF case 41a and the cooler connection piping 27 can be arranged vertically closer together (space saving). In addition, by lowering the height of the DPF case 41a and the cooler connection piping 27 as a result of vertically closer together, the height of the bonnet 4 can be reduced.

[0123] In this embodiment, the DPF case 41a and the SCR case 42a overlap with the two cooler connection pipes 27 in a side view. However, the cooler connection pipes 27 may be arranged to overlap with either the DPF case 41a or the SCR case 42a. In this way, the cooler connection pipes 27 only need to be arranged to overlap with at least one of the exhaust gas purification devices 40 that purifies exhaust gas in a side view.

[0124] Furthermore, as shown in Figure 12(a), the front and rear intermediate portions of the second extension 27b of the two cooler connection pipes 27 overlap with the engine 3's head cover 3a in a side view. More specifically, as shown in Figure 12(b), the bottom of the cross-section of the second extension 27b (front and rear intermediate portion), viewed from its longitudinal direction, is positioned lower than the upper end of the head cover 3a. Therefore, the bottom and surrounding area of ​​the front and rear intermediate portion of the second extension 27b overlap with the head cover 3a in a side view. By arranging the cooler connection pipes 27 so that at least a portion of them overlaps with the engine 3 in a side view, the engine 3 and the cooler connection pipes 27 can be positioned close together vertically.

[0125] Furthermore, as shown in Figure 13, the second extension portion 27b (the portion overlapping with the DPF case 41a, etc.) is positioned in the left-right direction between the axis L41 of the DPF case 41a and the axis L42 of the SCR case 42a. This allows the cooler connection piping 27 to be positioned using the left-right space between the DPF case 41a and the SCR case 42a, thereby saving space.

[0126] Furthermore, as shown in Figure 13(a), the second extension 27b (the portion overlapping with the DPF case 41a, etc.), the DPF case 41a, and the SCR case 42a overlap with the engine 3 in a plan view. This allows the DPF case 41a, etc., and the engine 3 to be arranged vertically, reducing the front-to-back and left-to-right space required for installing the DPF case 41a, etc., thus saving space.

[0127] Furthermore, the first cooler piping 28 overlaps with the DPF case 41a in a plan view. The second cooler piping 29 overlaps with the SCR case 42a in a plan view. As shown in Figures 13(b) and 14, the second cooler piping 29 is arranged to pass through a recess 42b formed at the front lower end of the SCR case 42a. With this configuration, the recess 42b allows for securing space for the installation of the second cooler piping 29 (the second cooler piping 29 is positioned using the recess 42b), thus saving space.

[0128] Next, with reference to Figure 10(c), the positional relationship between the DPF case 41a and the radiator connection piping 26 will be explained.

[0129] As described above, the radiator connection pipe 26 connects the radiator 22 and the engine 3. The radiator connection pipe 26 extends rearward from the upper and lower ends of the core 22b and connects to the engine 3. Of these, the radiator connection pipe 26 extending from the upper end of the core 22b extends rearward and downward above the fan shroud 22a. The radiator connection pipe 26 is positioned to pass through the lower recess 41e formed at the front lower end of the DPF case 41a. With this configuration, the lower recess 41e provides space for the radiator connection pipe 26, thereby saving space.

[0130] Furthermore, since the lower recess 41e has an inclined surface 41f that slopes downward towards the rear, air can be guided downward and rearward along the inclined surface 41f. This improves the airflow to the member located below the lower recess 41e. In this embodiment, since the engine 3 is positioned below the DPF 41, the airflow to a predetermined part of the engine 3 (for example, the injector) can be improved.

[0131] In this embodiment, the radiator connection pipe 26 is positioned to pass through the lower recess 41e. However, the pipe passing through the lower recess 41e is not limited to the radiator connection pipe 26 and can be appropriately changed depending on the arrangement of various equipment in the engine compartment R. For example, the first cooler pipe 28 (see Figure 13) described above may be positioned to pass through the lower recess 41e.

[0132] The pivot point 70, which serves as the pivot point for the bonnet 4, will be described below with reference to Figures 8 and 11. The pivot point 70 in this embodiment supports the bonnet 4 so that it can rotate. As described above, the pivot point 70 is provided on the second longitudinal portion 56b of the outer member 56. As shown in Figure 11, the pivot point 70 comprises a bracket 71 and a pivot shaft 72.

[0133] The bracket 71 is a member that supports the pivot shaft 72. As shown in Figure 11(b), the bracket 71 is formed in a shape that resembles a plate-shaped member with its plate surface oriented vertically, with both left and right ends bent upwards. The bracket 71 is placed on the upper surface of the second longitudinal portion 56b and fixed to the second longitudinal portion 56b. In this way, the pivot point 70 and the exhaust gas purification device 40 are supported by a common member (support member 50).

[0134] The pivot shaft 72 is an axial member that rotatably supports the hood 4. The pivot shaft 72 is positioned with its longitudinal direction oriented left to right. The pivot shaft 72 is inserted through the bracket 71. The hood 4 engages with the pivot shaft 72 (see the engaging portion 4b of the hood 4 shown in Figure 8). The hood 4 can rotate (oscillate up and down) around the pivot shaft 72.

[0135] Here, as described above, the outer member 56 is arranged to surround the left and right outer sides and the top of the DPF case 41a and the SCR case 42a. Of the outer member 56, the second longitudinal portion 56b is positioned above the DPF case 41a, etc. By providing a pivot point 70 on the upper surface of the second longitudinal portion 56b, the pivot point 70 is positioned above the DPF case 41a, etc., sandwiching the second longitudinal portion 56b (they overlap in a plan view).

[0136] Thus, in this embodiment, the DPF case 41a and SCR case 42a (exhaust gas purification device 40) and the pivot point 70 are arranged vertically side by side, reducing the front-to-rear space required for installing the DPF case 41a and the pivot point 70, etc. This makes it possible to shorten the overall length of the bonnet 4.

[0137] In this embodiment, the pivot point 70 is positioned above both the DPF case 41a and the SCR case 42a, but the pivot point 70 may be positioned above either the DPF case 41a or the SCR case 42a. Thus, the pivot point 70 only needs to be positioned above at least one of the exhaust gas purification devices 40 that purifies exhaust gas.

[0138] Furthermore, the outer member 56 (which in this embodiment is in an inverted U-shape when viewed from the front) surrounding the DPF case 41a, etc., is relatively resistant to deformation in the direction in which the bonnet 4 twists. By providing a pivot point 70 (rotation axis 72) on the outer member 56, the torsional strength of the bonnet 4 can be improved. The directions in which the bonnet 4 twists are clockwise and counterclockwise when viewed from the front.

[0139] Furthermore, as shown in Figure 11(a), the right end of the pivot shaft 72 is located to the left (inward on both sides of the vehicle body) of the right end of the right-side member 52. Also, the left end of the pivot shaft 72 is located to the right (inward on both sides of the vehicle body) of the left side surface of the heat shield 55. By fitting the pivot shaft 72 into the left-right width W50 of the support member 50 in this way, the left-right space required to install the pivot shaft 72 can be made relatively small. As a result, the left-right width of the bonnet 4 can be reduced.

[0140] The left-right width W50 of the support member 50 is the width along the left-right direction from the left end to the right end of the various members that form the frame of the support member 50 (left-side member 51 and right-side member 52, etc.). In this embodiment, it is the width along the left-right direction from the right end of the right-side member 52 to the left side of the heat shield plate 55 (plate-shaped portion 55a).

[0141] As is clear from Figure 9, the connecting pipe 44 is also positioned to fit within the left-right width W50 of the support member 50. That is, the right end of the connecting pipe 44 is located further inward on both sides of the vehicle body than the left end of the right-side member 52, and the left end of the connecting pipe 44 is located further inward on both sides of the vehicle body than the left side of the heat shield 55. By fitting the connecting pipe 44 within the left-right width W50 in this way, the left-right space required to install the support member 50 and the connecting pipe 44 can be made relatively small. As a result, the left-right width of the bonnet 4 can be reduced.

[0142] The configuration of the pivot point 70 described above is merely an example and can be modified as appropriate. For example, the pivot point 70 in this embodiment has a bracket 71 and a pivot shaft 72, but the bonnet 4 may be rotatably supported by other components. The pivot shaft 72 is positioned to fit within the left-right width W50 of the support member 50 (see Figure 11(a)), but is not limited to this, and at least one of the left or right ends of the pivot shaft 72 may be positioned to protrude to the left or right in a plan view relative to the support member 50. The pivot point 70 is supported by the outer member 56, but may be supported by other members.

[0143] The following describes the various components located in the lower right part of the cabin 12, referring to Figures 15 to 19. Specifically, the fuel tank 17, the urea water tank 18, and the urea water pump 19 will be described. The tank fixing structure 80 that secures the fuel tank 17 and the urea water tank 18 will also be described.

[0144] The fuel tank 17 is hollow and connected to the engine 3 (see Figure 3) via a hose or the like. As shown in Figures 17 and 19, the fuel tank 17 includes a tank housing recess 17a, a pump housing recess 17b, a piping housing recess 17c, and a band mounting recess 17d.

[0145] The tank housing recess 17a shown in Figure 17 is a recess that accommodates the lower part of the urea water tank 18. The tank housing recess 17a is formed at the front end of the fuel tank 17. The tank housing recess 17a is formed so that the upper surface of the fuel tank 17 is recessed downwards. Due to the formation of the tank housing recess 17a, the fuel tank 17 is formed so that the rear end bulges upwards relative to the front end.

[0146] The pump housing recess 17b shown in Figure 19 is a recess that accommodates the lower part of the urea water pump 19. The pump housing recess 17b is formed in a shape where the right side of the fuel tank 17 (the side facing outwards) is recessed toward the left (inwards). The pump housing recess 17b is formed from the front end of the fuel tank 17 to the middle of the front-to-back section. The front-to-back width of the pump housing recess 17b is approximately the same as the front-to-back width of the urea water pump 19.

[0147] The pipe housing recess 17c shown in Figures 17(b) and 19(a) is a recess for housing the drain pipe 18d, which will be described later. The pipe housing recess 17c is formed at the front end of the tank housing recess 17a. The pipe housing recess 17c is also formed in a recessed shape at the corner between the front side surface of the fuel tank 17 and the bottom surface (upward-facing surface) of the tank housing recess 17a. As shown in Figure 17(b), the pipe housing recess 17c is formed to slope downwards towards the front.

[0148] The band mounting recess 17d shown in Figure 19(a) is a recess formed in the portion to which the front band member 82, described later, will be attached. The band mounting recess 17d is formed in the middle of the front-to-rear part of the fuel tank 17. The band mounting recess 17d is formed in a shape where the left side of the fuel tank 17 (the side facing inward on both sides) is recessed toward the right (outward on both sides). The band mounting recess 17d is located to the left of the pump housing recess 17b.

[0149] The urea water tank 18 is connected to the exhaust gas purification device 40 (DPF 41) via a hose or the like (see Figure 9). The urea water tank 18 is formed in a hollow shape. As shown in Figures 17 and 19(b), the urea water tank 18 is equipped with a protrusion 18a, a pump housing recess 18b, and a refill port 18c.

[0150] The protruding portion 18a is a part that protrudes in a predetermined direction (rearward in this embodiment). The protruding portion 18a is formed in the middle of the upper and lower parts of the rear surface of the urea water tank 18. As shown in Figure 19(b), the protruding portion 18a is formed in a roughly rectangular shape when viewed from the rear. As shown in Figure 18, the left-right width W18a of the protruding portion 18a is formed to be the same width as the left-right width of the fuel tank 17 from the bottom surface of the band mounting recess 17d (the side facing left) to the bottom surface of the pump housing recess 17b (the side facing right). For the sake of explanation, the left-right width from the bottom surface of the band mounting recess 17d to the bottom surface of the pump housing recess 17b will be referred to as the "left-right width W17 of the fuel tank 17" below.

[0151] As shown in Figure 19(b), the left-right width W18a of the protruding portion 18a is formed to be more than half the left-right width W18 of the urea water tank 18. The left-right width W18 will be described below.

[0152] The dashed line in Figure 19(b) shows the range R18, which represents the area of ​​the urea water tank 18 that is at the same height as the protruding portion 18a. The left-right width W18 is the width along the left-right direction within the range R18, from the leftmost part of the urea water tank 18 to the rightmost part.

[0153] By forming the left-right width W18a of the protruding portion 18a to be more than half of the above left-right width W18, the left-right width W18a of the protruding portion 18a can be made relatively large, thereby ensuring the strength of the urea water tank 18 (protruding portion 18a). Note that the relationship between the left-right width W18a of the protruding portion 18a and the above left-right width W18 is not limited to this embodiment and can be changed as appropriate.

[0154] As shown in Figure 19(b), the pump housing recess 18b is a recess for housing the urea water pump 19. The pump housing recess 18b is formed on the lower part of the right side (the side facing outwards to the left and right) of the urea water tank 18. The pump housing recess 18b is formed in a shape that is recessed to the left (inwards to the left and right) from the front end to the rear end of the right side of the urea water tank 18. Due to the formation of the pump housing recess 18b, the urea water tank 18 is formed in a shape where the upper part bulges to the right relative to the lower part.

[0155] The replenishment port 18c shown in Figures 16 and 17 is for replenishing urea water in the urea water tank 18. The replenishment port 18c is formed in the upper right part of the urea water tank 18. The replenishment port 18c consists of an opening formed in the urea water tank 18 and a cap that is detachably provided on the opening.

[0156] The urea water tank 18 is provided with a drain pipe 18d for discharging the urea water stored inside to the outside. The drain pipe 18d is connected to the bottom surface of the urea water tank 18 and is positioned to extend downward from the urea water tank 18. A coupler 18e is provided at the lower end of the drain pipe 18d. By removing the coupler 18e, the worker can discharge the urea water from the urea water tank 18.

[0157] As shown in Figure 17, the lower part of the urea water tank 18 (the part below the protruding portion 18a) is housed in the tank housing recess 17a of the fuel tank 17. In this way, the urea water tank 18 is positioned above the fuel tank 17. Thus, in this embodiment, the fuel tank 17 is placed on a support base 20, and the urea water tank 18 is positioned on top of the fuel tank 17. This makes it possible to use the same support base 20 for tractors that do not have a urea water tank 18 (for example, tractors with relatively low horsepower and no SCR purification device).

[0158] Furthermore, if the fuel filler opening of the fuel tank 17 is located below the urea water tank 18, even if fuel leaks from the fuel tank 17 during refueling, it is possible to prevent the fuel from flowing down the fuel tank 17 into the urea water tank 18 (making it difficult for fuel to enter). In addition, the tank housing recess 17a secures space for the installation of the urea water tank 18, thereby reducing the vertical space required to install the fuel tank 17 and the urea water tank 18. As a result, the fuel tank 17 and the urea water tank 18 can be placed close to each other to secure tank capacity while saving space.

[0159] Furthermore, as shown in Figure 19(b), the pump housing recess 18b of the urea water tank 18 is located above the pump housing recess 17b of the fuel tank 17 when the urea water tank 18 is positioned above the fuel tank 17. Also, the bottom surface of the pump housing recess 18b and the bottom surface of the pump housing recess 17b are substantially flush.

[0160] As shown in Figure 17, the protrusion 18a is located behind the tank housing recess 17a when the urea water tank 18 is positioned above the fuel tank 17. The left side of the protrusion 18a is positioned to be substantially flush with the bottom surface of the band mounting recess 17d, as shown in Figure 18. The right side of the protrusion 18a is positioned to be substantially flush with the bottom surface of the pump housing recess 17b.

[0161] The urea water pump 19 shown in Figures 16 and 19 is connected to the urea water tank 18 and the exhaust gas purification device 40 (DPF 41) via a hose (not shown), and is configured to pump the urea water in the urea water tank 18 to the exhaust gas purification device 40. The urea water pump 19 is formed in a roughly rectangular parallelepiped shape.

[0162] The urea water pump 19 is housed in the pump housing recess 17b of the fuel tank 17 and the pump housing recess 18b of the urea water tank 18. In this arrangement, the urea water pump 19 is positioned so as not to protrude forward from the pump housing recess 17b. On the other hand, since the width of the urea water pump 19 is greater than the depth (width) of the pump housing recess 18b of the urea water tank 18, the right side of the urea water pump 19 is positioned to protrude to the right from the urea water tank 18.

[0163] By housing at least a portion of the urea solution pump 19 in the pump housing recess 18b, etc., the space required to install the urea solution pump 19 can be reduced (installation space can be secured). Therefore, space saving can be achieved.

[0164] Furthermore, the urea water pump 19 is positioned on the left and right outer sides of the fuel tank 17 and the urea water tank 18. This makes it less likely for the fuel tank 17, etc., to get in the way during maintenance of the urea water pump 19, thus making maintenance of the urea water pump 19 easier.

[0165] Here, as described above, a pipe housing recess 17c is formed in the tank housing recess 17a. Therefore, as shown in Figure 17(b), when the urea water tank 18 is positioned above the fuel tank 17, a space is secured between the bottom surface of the urea water tank 18 and the top surface of the fuel tank 17 (the bottom surface of the tank housing recess 17a) by the pipe housing recess 17c.

[0166] The drain pipe 18d described above extends to the front of the fuel tank 17 through the space (inside the pipe housing recess 17c). By positioning the drain pipe 18d using the pipe housing recess 17c in this way, the fuel tank 17 and the urea water tank 18 can be positioned closer to each other. This reduces the vertical space required to install the fuel tank 17 and the urea water tank 18, thus saving space. Furthermore, since the drain pipe 18d is connected to the bottom surface of the urea water tank 18 (a different part from the pump housing recess 18b), interference between the drain pipe 18d and the urea water pump 19 can be suppressed. In addition, by connecting the drain pipe 18d to the bottom surface of the urea water tank 18, urea water can be efficiently discharged from the urea water tank 18.

[0167] Here, as described above, the supercharger 21 (see Figure 3) is mounted on the left side of the engine 3. The supercharger 21 is located in the lower left part of the cabin 12. In contrast, the urea water tank 18 is located in the lower right part of the cabin 12, on the opposite side of the engine 3 from the supercharger 21 in the left-right direction. This makes it possible to suppress the deterioration of the urea water in the urea water tank 18.

[0168] More specifically, the side of the turbocharger 21 opposite the engine 3 is relatively far from the turbocharger 21, and therefore does not easily become hot when the tractor 1 is running. In this embodiment, by positioning the urea water tank 18 on the opposite side of the turbocharger 21, it is possible to suppress the urea water in the urea water tank 18 from becoming hot when the tractor 1 is running, thereby suppressing the deterioration of the urea water. Note that the positional relationship between the urea water tank 18 and the turbocharger 21 in this embodiment is just an example and can be changed as appropriate.

[0169] The tank fixing structure 80 shown in Figure 17 is a structure for fixing the fuel tank 17 and the urea water tank 18. The tank fixing structure 80 comprises a support base 20, a connecting plate 81, a front band member 82, and a rear band member 83.

[0170] The support base 20 shown in Figures 16 and 17 is a component on which the fuel tank 17 is mounted. The support base 20 is formed in a roughly U-shape when viewed from the front, with its opening facing upwards. The support base 20 is located on the right side (outer left and right) of the vehicle body and is fixed to the clutch housing 6 and the cabin support member 13 (see Figure 20). The structure for fixing the support base 20 will be described later. The fuel tank 17 is mounted on the upward-facing surface (mounting surface 20a) of the support base 20.

[0171] Furthermore, the urea solution pump 19 described above is fixed to the support base 20 via a predetermined component (bracket) or the like (not shown). As shown in Figure 16, the urea solution pump 19 is supported on the support base 20 at a position higher than the mounting surface 20a of the fuel tank 17. With this configuration, the urea solution pump 19 can be supported using the support base 20. In addition, since the mounting surface 20a is less likely to get in the way during maintenance of the urea solution pump 19, maintenance of the urea solution pump 19 can be made easier.

[0172] The connecting plate 81 shown in Figures 16 and 17 connects the front surfaces of the fuel tank 17 and the urea water tank 18 to each other. The connecting plate 81 is formed in the shape of a rectangular plate when viewed from the front, with its longitudinal direction oriented vertically. The connecting plate 81 is positioned to straddle the fuel tank 17 and the urea water tank 18 and is fixed to the fuel tank 17 and the urea water tank 18, respectively. In this way, the connecting plate 81 connects the fuel tank 17 and the urea water tank 18 to each other. In this embodiment, the connecting plate 81 has a notch 81a formed in it so as not to interfere with the drain pipe 18d (so as not to block the pipe housing recess 17c).

[0173] The front band member 82 shown in Figures 17 and 18 surrounds the outer circumference of the fuel tank 17 and the urea water tank 18, fixing them to the support base 20. The front band member 82 is positioned behind the connecting plate 81. The upper and lower middle portions of the front band member 82 overlap with the urea water pump 19 in a side view (see Figure 17(a)). This allows the urea water pump 19 and the front band member 82 to be placed side by side, reducing the front-to-back space required and thus saving space.

[0174] As shown in Figure 18, the front band member 82 is formed in an inverted U-shape when viewed from the front, with its opening facing downwards, and is formed in a band shape that surrounds both the left and right sides and the top surface of the fuel tank 17, etc. The front band member 82 comprises a flat portion 82a, a connecting portion 82b, and a bolt portion 82c.

[0175] The flat portion 82a is a flat section that sandwiches the fuel tank 17 and the urea water tank 18. The flat portion 82a is positioned with its plate surface facing left to right (horizontally). The flat portion 82a is formed in a rectangular shape when viewed from the side, with its longitudinal direction facing up to down (see Figure 17(a)). A pair of flat portions 82a are provided, one on the left and one on the right. The width of the inner surface of the left and right flat portions 82a is formed to be approximately the same width as the left and right width W18a of the protruding portion 18a.

[0176] The connecting portion 82b is the part that connects the upper ends of the left and right planar portions 82a to each other. The connecting portion 82b is formed in the shape of a plate with its surface oriented vertically.

[0177] The bolt portion 82c is a shaft-shaped portion on which male threads are formed on its outer surface. The bolt portion 82c is fixed to the lower end of the flat portion 82a and extends downward from the flat portion 82a. Bolt portions 82c are provided on both the left and right flat portions 82a.

[0178] The rear band member 83 shown in Figure 17(a) surrounds the outer circumference of the fuel tank 17 and secures the fuel tank 17 to the support base 20. The rear band member 83 is wrapped around the rear end of the fuel tank 17. Since the configuration of the rear band member 83 is the same as that of the front band member 82, a description of the configuration of the rear band member 83 will be omitted.

[0179] The following describes the procedure for securing the fuel tank 17 and the urea water tank 18 with the front band. First, the urea water tank 18 is positioned above the fuel tank 17, which is placed on the support base 20. At this time, as shown in Figure 18, the position of the urea water tank 18 is aligned so that the left and right sides of the protrusion 18a and the left and right sides of the fuel tank 17 (the bottom surfaces of the pump housing recess 17b and the band mounting recess 17d) are substantially flush. In this way, the left and right width W18a of the protrusion 18a and the left and right width W17 of the fuel tank 17 are formed to be the same width (see Figure 18), which makes it easier to align the urea water tank 18.

[0180] After positioning the urea water tank 18, the front band member 82 is wrapped around the protruding portion 18a of the urea water tank 18 and the fuel tank 17. In this way, the front band member 82 is provided so as to surround the outer circumference (both left and right sides and the top surface) of the fuel tank 17 and the protruding portion 18a. As described above, since the protruding portion 18a and the left and right sides of the fuel tank 17 are substantially flush, it is easy for the worker to wrap the front band member 82 around the tank.

[0181] With the front band member 82 wrapped around the protruding portion 18a, etc., the bolt portion 82c is inserted into the support base 20. A nut 82d is screwed onto the bolt portion 82c from the underside of the support base 20. In this way, the front band member 82 (flat portion 82a) is attached to the support base 20, and the fuel tank 17 and the urea water tank 18 are fixed together to the support base 20 by the front band member 82. With this configuration, the fuel tank 17 and the urea water tank 18 can be fixed together with a single front band member 82, thus simplifying the structure for fixing various tanks (tank fixing structure 80).

[0182] In this embodiment, the front band member 82 is attached to recesses formed in the fuel tank 17 (pump housing recess 17b, band mounting recess 17d). This makes it difficult for the front band member 82 to protrude from the fuel tank 17, thus saving space.

[0183] The following describes the structure for fixing the support base 20 (support base fixing structure) with reference to Figures 15 and 20. Figure 20 is a cross-sectional view taken along line A5-A5 in Figure 15.

[0184] As described above, the support base 20 is formed in a roughly U-shape when viewed from the front. Both the left and right ends of the support base 20 are supported by the vehicle body, respectively. As shown in Figure 20, in this embodiment, the left end (the inner left and right ends) of the support base 20 is supported by the right side of the clutch housing 6. The right end (the outer left and right ends) of the support base 20 is supported by the cabin support member 13 via the extension member 90. The configurations of the cabin support member 13 and the extension member 90 will be described below.

[0185] The cabin support member 13 shown in Figure 20 supports the front part of the cabin 12. The cabin support member 13 is positioned above the support base 20. The cabin support member 13 is formed in a shape on which the cabin 12 can be placed. The cabin support member 13 comprises a plate-shaped portion 13a, a longitudinal portion 13b, and a mounting portion 13c.

[0186] The plate-shaped portion 13a is a plate-shaped part with its surface oriented in the left-right direction. The plate-shaped portion 13a is fixed to the right side of the clutch housing 6. The longitudinal portion 13b is a part that extends outward (to the right) from the plate-shaped portion 13a. The longitudinal portion 13b is positioned above the support base 20, with the fuel tank 17 in between. The mounting portion 13c is the part on which the cabin 12 is mounted (see Figure 15). The mounting portion 13c is made of rubber or the like and is provided on the longitudinal portion 13b.

[0187] The extension member 90 is a member that extends upward from the right end of the support base 20. The extension member 90 is formed in a plate shape. The extension member 90 extends upward from the right end of the support base 20, and is formed so that its upper end bends to the left (towards the cabin support member 13). The extension member 90 is fixed to the longitudinal portion 13b of the cabin support member 13 and to the support base 20, respectively.

[0188] Thus, in this embodiment, the support base 20 is supported by the vehicle body not only at its left end (the inner left and right ends) but also at its right end (the outer left and right ends). This allows the weight of the fuel tank 17 and other components to be supported at both the left and right ends of the support base 20, thereby suppressing deflection of the support base 20 and providing firm support to the support base 20.

[0189] Furthermore, the support base 20, extension member 90, and cabin support member 13 are formed in a frame-like shape that surrounds the lower, right, and upper surfaces of the fuel tank 17. This makes the support base 20 and extension member 90 less susceptible to deformation (improving their strength), and allows the support base 20 to be firmly supported. It also suppresses vibrations of the support base 20 and other components. As a result, noise caused by vibrations of the support base 20 and other components can be reduced.

[0190] As shown in Figures 15 and 16, a cover member 100 is attached to the support base 20 to cover the fuel tank 17, urea water tank 18, drain piping 18d, and urea water pump 19, etc. The cover member 100 can protect the fuel tank 17, etc. An example of the configuration of the cover member 100 will be described below. The cover member 100 comprises a first plate portion 101 and a second plate portion 102.

[0191] The first plate portion 101 is the part that covers the urea water pump 19 and the like from the right side and above. The first plate portion 101 comprises a vertical portion 101a, an inclined portion 101b, a horizontal portion 101c, and a cover recess 101d.

[0192] The vertical portion 101a is a part that extends in the vertical direction. The vertical portion 101a is formed in the shape of a plate with its surface oriented in the left-right direction. The vertical portion 101a is positioned to the right of the urea water pump 19, etc. The vertical portion 101a is also positioned to extend from the front end to the middle of the support base 20. The lower end of the vertical portion 101a is fixed to the support base 20. The rear end of the vertical portion 101a is positioned to overlap with the extension member 90 in a side view and is fixed to the extension member 90. In this embodiment, the cover member 100 is fixed to multiple members (support base 20 and extension member 90). This allows the cover member 100 to be firmly supported.

[0193] The inclined portion 101b shown in Figure 16 is a portion that is inclined in the vertical and horizontal directions. The inclined portion 101b is formed to extend upward and to the left from the upper end of the vertical portion 101a. The inclined portion 101b is located on the upper right side of the urea water tank 18.

[0194] The horizontal section 101c is a portion that extends horizontally. The horizontal section 101c is formed to extend to the left from the upper left end of the inclined section 101b. The horizontal section 101c is located above the urea water tank 18.

[0195] The cover recess 101d shown in Figures 15 and 16 is a recess formed in the inclined portion 101b. The cover recess 101d is formed in the inclined portion 101b with a shape that is recessed downward (towards the urea water tank 18).

[0196] The second plate portion 102 shown in Figure 15 is the part that covers the urea water pump 19 and the like from the front. The second plate portion 102 is positioned with its plate surface facing in the front-to-back direction. The second plate portion 102 is also positioned in front of the fuel tank 17 and the drain pipe 18d (see Figure 17(b)).

[0197] As shown in Figure 16, the refill port 18c of the urea water tank 18 described above is positioned to be exposed to the outside of the cover member 100 through the cover recess 101d. The refill port 18c is also positioned to fit within the cover recess 101d (without protruding). With this configuration, the refill port 18c can be protected by the cover recess 101d. Furthermore, since the refill port 18c is exposed to the outside through the cover recess 101d, the urea water can be refilled without removing the cover member 100, making it easier to refill the urea water.

[0198] The configuration of the cover member 100 described above is merely an example and is not limited to this embodiment. For example, although the cover member 100 is provided with a cover recess 101d, it is also possible to omit the cover recess 101d.

[0199] As described above, the tractor 1 (work vehicle) according to this embodiment comprises a radiator 22 for cooling the coolant of the engine 3, and a plurality of first cooling devices positioned in front of the radiator 22 and slidably mounted relative to the vehicle body. In this embodiment, an example of the first cooling devices is an oil cooler 23 and a condenser 24 that are slidably mounted in the left-right direction (see Figures 5 and 6).

[0200] With this configuration, when performing maintenance on the first cooling equipment, the multiple first cooling equipment units (oil cooler 23, condenser 24) can be moved to positions that are easily accessible for maintenance. Therefore, even if the gap between the first cooling equipment and the radiator 22 is narrowed, it is possible to prevent the first cooling equipment from becoming difficult to maintain.

[0201] Furthermore, the first cooling device includes an oil cooler 23 for cooling the oil.

[0202] By configuring it in this way, even if the gap between the oil cooler 23 and the radiator 22 is narrowed, it is possible to prevent the oil cooler 23 from becoming difficult to maintain.

[0203] Furthermore, the first cooling device includes a condenser 24 that cools the refrigerant of the air conditioner unit 16.

[0204] By configuring it in this way, even if the gap between the capacitor 24 and the radiator 22 is narrowed, it is possible to suppress the difficulty in maintaining the capacitor 24.

[0205] Furthermore, the condenser 24 is positioned in front of the oil cooler 23, which cools the oil (see Figure 3).

[0206] With this configuration, when air flows from the front to the rear of the condenser 24, heat exchange can be performed in the condenser 24 before the oil cooler 23. This improves the cooling efficiency of the condenser 24.

[0207] Furthermore, the tractor 1 has an engine room R in which the engine 3 and the first cooling equipment (oil cooler 23, etc.) are located, and a bonnet 4 located in front of the driver's seat 14 and forming at least a part of the engine room R, and the first cooling equipment (oil cooler 23, condenser 24) is located outside the front wheels 8 in a side view (see Figure 7).

[0208] By configuring it in this way, even if the steering angle of the front wheels 8 is increased, it is possible to prevent the front wheels 8 from interfering with the first cooling equipment (oil cooler 23, condenser 24).

[0209] Furthermore, the first cooling device (oil cooler 23, condenser 24) is configured to slide in the left-right direction.

[0210] This configuration makes it easier to slide the first cooling equipment (oil cooler 23, condenser 24) from side to side, as the front wheels 8 are less likely to get in the way when sliding the first cooling equipment.

[0211] Furthermore, the tractor 1 is further equipped with a second cooling device positioned in front of the first cooling device (oil cooler 23, condenser 24) and mounted so as not to slide relative to the vehicle body. In this embodiment, an intercooler 25 fixed to the vehicle body is described as an example of the second cooling device (see Figure 3).

[0212] By configuring the system in this way, even if the gap between the first cooling device (oil cooler 23, condenser 24) and the second cooling device (intercooler 25) is narrowed, it is possible to prevent the first cooling device from becoming difficult to maintain.

[0213] Furthermore, at least a portion of the second cooling device (intercooler 25) overlaps with the front wheel 8 in a side view (see Figure 7).

[0214] This configuration allows for effective use of the space between the left and right front wheels 8.

[0215] Furthermore, the left-right width W25 of the second cooling device (intercooler 25) is smaller than the left-right widths W23 and W24 of the first cooling device (oil cooler 23, condenser 24) (see Figure 4).

[0216] By configuring it in this way, the width W25 of the second cooling device (intercooler 25) can be made relatively small, so that even if the steering angle of the front wheels 8 is increased, interference between the front wheels 8 and the second cooling device can be suppressed.

[0217] Furthermore, the second cooling device includes an intercooler 25 that cools the compressed air supplied to the engine 3.

[0218] By configuring the system in this way, even if the gap between the first cooling equipment (oil cooler 23, condenser 24) and the intercooler 25 is narrowed, it is possible to suppress the difficulty in maintaining the first cooling equipment.

[0219] Furthermore, the position of the radiator 22 in the longitudinal direction coincides with the position of the axle 8a of the front wheel 8 in the longitudinal direction (see Figure 7).

[0220] By configuring it in this way, even if the steering angle of the front wheels 8 is increased, interference between the front wheels 8 and the radiator 22 can be suppressed.

[0221] In this embodiment, the tractor 1 is one form of a work vehicle.

[0222] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment comprises an exhaust gas purification device 40 for purifying exhaust gas discharged from the engine 3, an intercooler 25 for cooling compressed air supplied to the engine 3, and a cooler connection pipe 27 that connects the engine 3 and the intercooler 25, with at least a portion of it overlapping with the exhaust gas purification device 40 in a side view. In this embodiment, the front end to the rear end of the second extension portion 27b of the cooler connection pipe 27 overlaps with the exhaust gas purification device 40 in a side view (see Figure 12).

[0223] By configuring it in this way, the exhaust gas purification device 40 and the cooler connection piping 27 can be arranged close together vertically, thus saving space.

[0224] Furthermore, the exhaust gas purification device 40 includes a first case (DPF case 41a) for collecting particulate matter in the exhaust gas discharged from the engine 3, and a second case (SCR case 42a) for purifying nitrogen oxides in the exhaust gas. At least a portion of the cooler connection piping 27 overlaps with the first and second cases in a side view (see Figure 12).

[0225] By configuring it in this way, the DPF case 41a and the cooler connection piping 27 can be arranged close together vertically, thus saving space.

[0226] Furthermore, of the cooler connection piping 27, the portion that overlaps with the first case (DPF case 41a) and the second case (SCR case 42a) in a side view, and the portion that overlaps with the engine 3 in a plan view, are the same as the portion that overlaps with the first case and the second case (see Figure 13(a)).

[0227] By configuring the system in this way, the first case (DPF case 41a), the second case (SCR case 42a), the cooler connection piping 27, and the engine 3 can be arranged vertically, thereby reducing the front-to-back and left-to-right space required for installing the first case and other components, and thus saving space.

[0228] Furthermore, at least a portion of the cooler connection piping 27 overlaps with the top and side views of the engine 3 (see Figure 12).

[0229] By configuring it in this way, the engine 3 and the cooler connection pipe 27 can be arranged close together vertically, thus saving space.

[0230] Furthermore, the first case (DPF case 41a) and the second case (SCR case 42a) are arranged with their longitudinal direction facing the front-to-back direction, and are also arranged side by side in the left-to-right direction (see Figure 12).

[0231] By configuring the units in this way, the first case (DPF case 41a) and the second case (SCR case 42a) can be placed side by side, reducing the vertical space required to install them. Furthermore, by arranging the first and second cases in the front-to-back direction, the horizontal space required to install them can be reduced. This allows for space savings.

[0232] Furthermore, the portion of the cooler connection piping 27 that overlaps with the first case (DPF case 41a) and the second case (SCR case 42a) in a side view is positioned in the left-right direction between the axis L41 of the first case and the axis L42 of the second case, which are aligned along the longitudinal direction (see Figure 13).

[0233] By configuring it in this way, the cooler connection piping 27 can be placed using the space on the left and right between the first case (DPF case 41a) and the second case (SCR case 42a), thus saving space.

[0234] Furthermore, a recess 42b is formed in at least one of the first case (DPF case 41a) or the second case (SCR case 42a), and the cooler connection piping 27 (second cooler piping 29) is arranged to pass through the recess 42b (see Figures 13(b) and 14).

[0235] By configuring it in this way, the recess 42b provides space for installing the cooler connection piping 27, thus saving space.

[0236] Furthermore, the tractor 1 in this embodiment is one form of a work vehicle. Also, the DPF case 41a in this embodiment is one form of a first case. Also, the SCR case 42a in this embodiment is one form of a second case.

[0237] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment comprises an exhaust gas purification device 40 that purifies the exhaust gas discharged from the engine 3, and a support member 50 that supports the exhaust gas purification device 40 and is formed in the shape of a frame that surrounds the upper part of the engine 3 from the outside in the horizontal direction (see Figures 8 and 11).

[0238] By configuring it in this way, the support members 50 can be positioned closer together vertically (lowering their height) relative to the engine 3, thus saving space.

[0239] Furthermore, the exhaust gas purification device 40 includes a first case (DPF case 41a) for collecting particulate matter in the exhaust gas discharged from the engine 3, and a second case (SCR case 42a) for purifying nitrogen oxides in the exhaust gas.

[0240] By configuring it in this way, the height positions of the first case (DPF case 41a) and the second case (SCR case 42a) can be lowered.

[0241] Furthermore, the support member 50 is positioned lower than the upper end of the head cover 3a of the engine 3 (see Figure 8).

[0242] By configuring it in this way, the height position of the support member 50 can be made relatively low.

[0243] Furthermore, the support member 50 is positioned in front of the rear surface of the flywheel housing 5 that houses the flywheel (see Figure 8).

[0244] By configuring it in this way, the support member 50 can be positioned relatively far forward, and space can be secured behind the support member 50.

[0245] Furthermore, the support member 50 supports the electrical components (connector 61a) of the exhaust gas purification device 40 (see Figure 8).

[0246] By configuring it in this way, the exhaust gas purification device 40 and the connector 61a can be supported by a common component (support member 50).

[0247] Furthermore, the support member 50 is configured to support the electrical component (connector 61a) by connecting it to an electrical component fixing member (connector fixing member 59) to which the electrical component (connector 61a) is fixed, and the electrical component is positioned lower than the connection portion P59 between the support member 50 and the electrical component fixing member (see Figure 8).

[0248] This configuration makes it possible to mitigate the effects of heat on the electrical components (connector 61a). More specifically, since the heat generated by the engine 3 etc. rises, the higher the position, the more likely it is to become hot. In this embodiment, the electrical components (connector 61a) can be placed at a relatively low position, thus mitigating the effects of heat on the electrical components.

[0249] Furthermore, the support member 50 has a heat shield 55 that covers the supercharger 21 of the engine 3 (see Figure 8).

[0250] By configuring it in this way, the heat shield 55 can suppress the transfer of heat from the supercharger 21 to other components.

[0251] Furthermore, the support member 50 supports the temperature sensor 64 that detects the temperature of the exhaust gas (see Figure 8).

[0252] By configuring it in this way, the exhaust gas purification device 40 and the temperature sensor 64 can be supported by a common component (support member 50).

[0253] Furthermore, the support member 50 has an outer member 56 that surrounds the left, right, outer and upper sides of the exhaust gas purification device 40 (see Figures 8 and 11(b)).

[0254] By configuring it in this way, the outer member 56 can surround the exhaust gas purification device 40.

[0255] Furthermore, the outer member 56 is provided with a pivot point 70 that serves as the pivot point for the bonnet 4 (see Figure 8).

[0256] By configuring it in this way, the exhaust gas purification device 40 and the pivot point 70 can be supported by a common component (support member 50).

[0257] Furthermore, the pivot point 70 overlaps with the exhaust gas purification device 40 in a plan view (see Figures 8 and 11(b)).

[0258] By configuring the system in this way, the exhaust gas purification device 40 and the pivot point 70 can be placed vertically, reducing the front-to-back space required for installing the exhaust gas purification device 40 and the pivot point 70. This allows for space savings.

[0259] Furthermore, the tractor 1 according to this embodiment is one form of a work vehicle. Also, the DPF case 41a according to this embodiment is one form of a first case. Also, the SCR case 42a according to this embodiment is one form of a second case. Also, the connector 61a according to this embodiment is one form of an electrical component. Also, the connector fixing member 59 according to this embodiment is one form of an electrical component fixing member.

[0260] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment comprises a cooling fan 3c provided on the engine 3, a fan shroud 22a formed to surround the cooling fan 3c and guide air, and an exhaust gas purification device 40 arranged to fit within the left-right width W22 of the fan shroud 22a and purify the exhaust gas discharged from the engine 3 (see Figure 9).

[0261] By configuring the system in this way, the exhaust gas purification device 40 can be positioned to fit within the left-right width W22 of the fan shroud 22a, thereby reducing the required left-right space for installing the exhaust gas purification device 40 and the fan shroud 22a. This allows for space savings.

[0262] Furthermore, the exhaust gas purification device 40 comprises a first case (DPF case 41a) for collecting particulate matter in the exhaust gas discharged from the engine 3, and a second case (SCR case 42a) for purifying nitrogen oxides in the exhaust gas.

[0263] By configuring the system in this way, the first case (DPF case 41a) and the second case (SCR case 42a) can be positioned to fit within the left-right width W22 of the fan shroud 22a, thereby reducing the required left-right space for installing the first and second cases. This allows for space savings.

[0264] Furthermore, the first case (DPF case 41a) and the second case (SCR case 42a) are positioned in front of the rear surface of the flywheel housing 5 that houses the flywheel (see Figure 8).

[0265] By configuring it in this way, the first case (DPF case 41a) and the second case (SCR case 42a) can be positioned relatively far forward, and space can be secured behind the first and second cases.

[0266] Furthermore, the first case (DPF case 41a) and the second case (SCR case 42a) are arranged with their longitudinal direction facing the front-to-back direction, and are also arranged side by side in the left-to-right direction (see Figure 12).

[0267] By configuring the units in this way, the first case (DPF case 41a) and the second case (SCR case 42a) can be placed side by side, reducing the vertical space required to install them. Furthermore, by arranging the long sides of the first and second cases in the front-to-back direction, the horizontal space required to install them can be reduced. This allows for space savings.

[0268] Furthermore, the tractor 1 is further equipped with an intercooler 25 for cooling the compressed air supplied to the engine 3, and a cooler connection pipe 27 which is arranged to pass between the first case (DPF case 41a) and the second case (SCR case 42a) and connects the engine 3 and the intercooler 25 (see Figures 3 and 12).

[0269] By configuring it in this way, the cooler connection piping 27 can be placed in the space between the first case (DPF case 41a) and the second case (SCR case 42a), thus saving space.

[0270] Furthermore, the tractor 1 overlaps with the first case (DPF case 41a) in a side view and is further equipped with a differential pressure sensor 67 that detects the differential pressure of the exhaust gas between the first portion 67c of the first case and the second portion 67d which is downstream of the first portion 67c in the direction of exhaust gas flow (see Figures 10(a) and 10(b)).

[0271] This configuration mitigates the thermal effects on the differential pressure sensor 67. More specifically, since heat generated by the engine 3 and other components rises, higher positions tend to become hotter. In this embodiment, by arranging the differential pressure sensor 67 so as to overlap with the first case (DPF case 41a) in a side view, it is possible to prevent the height of the differential pressure sensor 67 from becoming unnecessarily high. Therefore, it is possible to prevent the differential pressure sensor 67 from becoming hot (mitigate the thermal effects).

[0272] Furthermore, the differential pressure sensor 67 is positioned between the first portion 67c and the second portion 67d in the front-rear direction, and the tractor 1 further comprises a first connecting pipe 67a extending downward from the differential pressure sensor 67 toward the first portion 67c, and a second connecting pipe 67b extending downward from the differential pressure sensor 67 toward the second portion 67d (see Figures 10(a) and 10(b)).

[0273] By configuring the system in this way, condensed water (water formed from condensed water contained in exhaust gas) can be directed away from the differential pressure sensor 67 within the first connecting pipe 67a and the second connecting pipe 67b, thereby suppressing malfunctions in the differential pressure sensor 67. Furthermore, by positioning the differential pressure sensor 67 between the first section 67c and the second section 67d, the first connecting pipe 67a and the second connecting pipe 67b can be extended in different directions (forward or backward) from the differential pressure sensor 67, making it easier to position the first connecting pipe 67a and the second connecting pipe 67b.

[0274] Furthermore, the tractor 1 is further equipped with a bonnet 4 having an opening 4a formed on its upper surface (see Figure 8).

[0275] This configuration allows heat from inside the hood 4 to be expelled to the outside of the hood 4 through the opening 4a, thereby lowering the temperature inside the hood 4.

[0276] Furthermore, the tractor 1 in this embodiment is one form of a work vehicle. Also, the DPF case 41a in this embodiment is one form of a first case. Also, the SCR case 42a in this embodiment is one form of a second case.

[0277] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment includes a first case (DPF case 41a), a second case (SCR case 42a), a connecting pipe 44 that connects the first case and the second case to each other, an exhaust gas purification device 40 that purifies the exhaust gas discharged from the engine 3, and a support member 50 that supports the exhaust gas purification device 40, and the connecting pipe 44 is arranged to fit within the left-right width W50 of the support member 50 (see Figure 9).

[0278] By configuring it in this way, the connecting pipe 44 fits within the left-right width W50 of the support member 50, making it possible to relatively reduce the left-right space required to install the support member 50 and the connecting pipe 44. Therefore, space saving can be achieved.

[0279] Furthermore, the first case (DPF case 41a) collects particulate matter in the exhaust gas discharged from the engine 3, and the second case (SCR case 42a) purifies nitrogen oxides in the exhaust gas.

[0280] By configuring the system in this way, a space can be saved in a configuration in which a first case (DPF case 41a) that collects particulate matter in the exhaust gas and a second case (SCR case 42a) that purifies nitrogen oxides in the exhaust gas are connected by a connecting pipe 44.

[0281] Furthermore, the first case (DPF case 41a) and the second case (SCR case 42a) are arranged with their longitudinal direction facing the front-to-back direction, and are also arranged side by side in the left-to-right direction (see Figure 12).

[0282] By configuring the units in this way, the first case (DPF case 41a) and the second case (SCR case 42a) can be placed side by side, reducing the vertical space required to install them. Furthermore, by arranging the long sides of the first and second cases in the front-to-back direction, the horizontal space required to install them can be reduced. This allows for space savings.

[0283] Furthermore, the connecting pipe 44 is positioned with its longitudinal direction oriented to the left and right (see Figures 10(a) and 10(b)).

[0284] By configuring it in this way, the first case (DPF case 41a) and the second case (SCR case 42a) can be connected over a short distance, thus shortening the length of the connecting pipe 44 and saving space.

[0285] Furthermore, the connecting pipe 44 overlaps with the first case (DPF case 41a) and the second case (SCR case 42a) in a side view (see Figure 10(b)).

[0286] By configuring the system in this way, the first case (DPF case 41a) and the second case (SCR case 42a) and the connecting pipe 44 can be arranged so that they overlap in a side view, thereby securing space above and below the first case and the connecting pipe 44.

[0287] Furthermore, the connecting pipe 44 is configured to connect the front ends of the first case (DPF case 41a) and the second case (SCR case 42a) to each other, and the exhaust gas flows forward through the first case, then flows into the second case via the connecting pipe 44, and then flows backward through the second case (see Figure 9).

[0288] By configuring it in this way, the exhaust gas flow path can be simplified.

[0289] Furthermore, the tractor 1 is further equipped with an exhaust pipe 45 that discharges the exhaust gas, purified by the exhaust gas purification device 40, from the left side of the vehicle body towards the outside space (see Figures 1 and 9).

[0290] This configuration ensures that the exhaust pipe 45 does not obstruct the view of the right side of the tractor 1, thus providing a clear view of the right side of the tractor 1. Furthermore, since operators often drive the tractor 1 while looking at the right side where many control devices are located, ensuring a clear view of the right side of the tractor 1 makes it easier to drive the tractor 1.

[0291] Furthermore, the support member 50 is formed in a frame shape that surrounds the upper part of the engine 3 from the outside in the horizontal direction (see Figures 8 and 11).

[0292] By configuring it in this way, the support members 50 can be positioned closer together vertically (lowering their height) relative to the engine 3, thus saving space.

[0293] Furthermore, the tractor 1 in this embodiment is one form of a work vehicle. Also, the DPF case 41a in this embodiment is one form of a first case. Also, the SCR case 42a in this embodiment is one form of a second case.

[0294] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment is equipped with an exhaust gas purification device 40 that purifies the exhaust gas discharged from the engine 3, and a pivot point 70 that is positioned above the exhaust gas purification device 40 and serves as the pivot point for the bonnet 4 (see Figures 8 and 11).

[0295] By configuring it in this way, the exhaust gas purification device 40 and the pivot point 70 (rotating shaft 72, etc.) can be placed vertically, reducing the front-to-rear space required to install the exhaust gas purification device 40, etc. As a result, the overall length (front-to-rear length) of the bonnet 4 can be shortened.

[0296] Furthermore, the exhaust gas purification device comprises a first case (DPF case 41a) for collecting particulate matter in the exhaust gas discharged from the engine 3, and a second case (SCR case 42a) for purifying nitrogen oxides in the exhaust gas.

[0297] By configuring it in this way, the first case (DPF case 41a) and the second case (SCR case 42a) and the pivot point 70 can be arranged vertically, reducing the front-to-rear space required for installing the exhaust gas purification device 40 and the like. As a result, the overall length of the bonnet 4 can be shortened.

[0298] Furthermore, the first case (DPF case 41a) and the second case (SCR case 42a) are arranged with their longitudinal direction facing the front-to-back direction, and are also arranged side by side in the left-to-right direction (see Figure 12).

[0299] By configuring the hood in this way, the first case (DPF case 41a) and the second case (SCR case 42a) are placed side by side in the left-right direction, reducing the vertical space required to install the first and second cases and thus lowering the height of the hood 4. Furthermore, by arranging the long sides of the first and second cases in the front-rear direction, the width of the hood 4 can be reduced.

[0300] Furthermore, the tractor 1 is further provided with outer members 56 that surround the left and right outer sides and the top of the first case (DPF case 41a) and the second case (SCR case 42a), and the pivot point 70 is provided on the outer member 56 and has a pivot shaft 72 that rotatably supports the bonnet 4 (see Figures 8 and 11).

[0301] This configuration makes it difficult for the bonnet 4 to be displaced in a twisting direction. More specifically, the outer members 56 surrounding the left and right outer sides and top of the first case (DPF case 41a) and the second case (SCR case 42a) are difficult to deform in the twisting direction of the bonnet 4 (clockwise and counterclockwise directions when viewed from the front). In this embodiment, by providing a pivot shaft 72 in the outer member 56, it is possible to make it difficult for the bonnet 4 to be displaced in a twisting direction (improve torsional strength).

[0302] Furthermore, the tractor 1 has the outer member 56 and further comprises a support member 50 that supports the first case (DPF case 41a) and the second case (SCR case 42a) (see Figures 8 and 11).

[0303] With this configuration, the first case (DPF case 41a), the second case (SCR case 42a), and the support point 70 can be supported by a common member (support member 50).

[0304] Furthermore, the support member 50 is formed in a frame shape that surrounds the upper part of the engine 3 from the outside in the horizontal direction (see Figures 8 and 11).

[0305] By configuring it in this way, the support members 50 can be positioned closer together vertically relative to the engine 3 (lowering their height). Consequently, by lowering the height of the first case (DPF case 41a) and the second case (SCR case 42a), the height of the bonnet 4 can be lowered.

[0306] Furthermore, the pivot shaft 72 is positioned so as to fit within the left-right width W50 of the support member 50 (see Figure 11(a)).

[0307] By configuring it in this way, the pivot shaft 72 fits within the left-right width W50 of the support member 50, making it possible to relatively reduce the left-right space required to install the pivot shaft 72. As a result, the left-right width of the bonnet 4 can be reduced.

[0308] Furthermore, the tractor 1 in this embodiment is one form of a work vehicle. Also, the DPF case 41a in this embodiment is one form of a first case. Also, the SCR case 42a in this embodiment is one form of a second case.

[0309] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment comprises a urea water tank 18 in which urea water is stored, and a urea water pump 19 that supplies the urea water in the urea water tank 18 to an exhaust gas purification device 40 that purifies the exhaust gas of the engine 3. The urea water tank 18 has a first pump housing recess (pump housing recess 18b) that houses at least a part of the urea water pump 19 (see Figure 19(b)).

[0310] By configuring it in this way, the first pump housing recess (pump housing recess 18b) can be used to secure space for installing the urea water pump 19, thus enabling space saving.

[0311] Furthermore, the first pump housing recess (pump housing recess 18b) is formed on the side of the urea water tank 18 facing outwards to the left and right of the vehicle body (right side) (see Figure 19(b)).

[0312] This configuration allows the urea water pump 19 to be positioned on the left and right outer sides of the urea water tank 18, making it easier to maintain the urea water pump 19.

[0313] Furthermore, the first pump housing recess (pump housing recess 18b) is formed in the lower part of the left and right outward-facing sides of the urea water tank 18, with the front end to the rear end of the urea water tank 18 being recessed inward on both sides (see Figures 17(b) and 19(b)).

[0314] By configuring it in this way, the urea water pump 19 can be placed below the urea water tank 18.

[0315] Furthermore, the tractor 1 is further equipped with a fuel tank 17 for storing fuel, and the urea water tank 18 is positioned above the fuel tank 17 (see Figure 17).

[0316] This configuration makes it difficult for fuel to enter the urea water tank 18.

[0317] Furthermore, the fuel tank 17 has a second pump housing recess (pump housing recess 17b) that houses at least a portion of the urea water pump 19 (see Figure 19).

[0318] By configuring it in this way, the second pump housing recess (pump housing recess 17b) can be used to secure space for installing the urea water pump 19, thus saving space.

[0319] Furthermore, the second pump housing recess (pump housing recess 17b) is formed on the side of the fuel tank 17 facing outwards to the left and right of the vehicle body (right side) (see Figure 19).

[0320] This configuration allows the urea water pump 19 to be positioned on the left and right outer sides of the fuel tank 17, making it easier to maintain the urea water pump 19.

[0321] Furthermore, the second pump housing recess (pump housing recess 17b) is formed in a shape that is recessed inwards to the left and right from the front end to the middle of the left and right outward-facing side surface (see Figure 19).

[0322] By configuring it in this way, the urea water pump 19 can be positioned around the front of the fuel tank 17.

[0323] Furthermore, the tractor 1 is further provided with a cover member 100 that covers the urea water tank 18, and the cover member 100 has a cover recess 101d that is recessed toward the urea water tank 18, and a supply port 18c for supplying urea water to the urea water tank 18 is positioned in the cover recess 101d so as to be exposed to the outside of the cover member 100 (see Figures 15 and 16).

[0324] This configuration allows the cover recess 101d to protect the replenishment port 18c. Furthermore, since the replenishment port 18c is exposed to the outside through the cover recess 101d, the urea solution can be replenished without removing the cover member 100, making it easier to replenish the urea solution.

[0325] Furthermore, the urea water tank 18 is positioned on the opposite side of the supercharger 21 from the engine 3 in the left-right direction (see Figures 3 and 15).

[0326] This configuration suppresses the deterioration of the urea solution in the urea solution tank 18. More specifically, the side opposite the turbocharger 21, which is flanked by the engine 3, is relatively far from the turbocharger 21 and therefore does not easily become hot when the tractor 1 is running. In this embodiment, by arranging the urea solution tank 18 on the opposite side of the turbocharger 21, it is possible to suppress the urea solution in the urea solution tank 18 from becoming hot when the tractor 1 is running, thereby suppressing the deterioration of the urea solution.

[0327] Furthermore, the tractor 1 according to this embodiment is one form of a work vehicle. Also, the pump housing recess 18b of the urea water tank 18 according to this embodiment is one form of a first pump housing recess. Also, the pump housing recess 17b of the fuel tank 17 according to this embodiment is one form of a second pump housing recess.

[0328] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment comprises a urea water tank 18 provided with a drain pipe 18d for discharging urea water to the outside, and a fuel tank 17 located below the urea water tank 18, which stores fuel and has a pipe housing recess 17c formed therein for housing at least a part of the drain pipe 18d (see Figure 17(b)).

[0329] This configuration ensures that the urea water tank 18 is positioned above the fuel tank 17, making it difficult for fuel to enter the urea water tank 18. Furthermore, the pipe housing recess 17c provides space for the drain pipe 18d, allowing the fuel tank 17 and the urea water tank 18 to be positioned closer together. This allows for space savings.

[0330] Furthermore, the upper surface of the fuel tank 17 is formed with a tank housing recess 17a that is recessed downwards and accommodates at least a portion of the urea water tank 18 (see Figure 17).

[0331] By configuring it in this way, the tank housing recess 17a can secure space for installing the urea water tank 18, thus saving space.

[0332] Furthermore, the pipe housing recess 17c is formed in the tank housing recess 17a (see Figure 17(b)).

[0333] This configuration makes it easier to connect the drain pipe 18d to a part of the urea water tank 18 that can efficiently discharge the urea water (for example, the bottom surface).

[0334] Furthermore, the tank housing recess 17a is formed at the front end of the fuel tank 17, and the piping housing recess 17c is formed in a recessed shape at the corner between the front side surface of the fuel tank 17 and the bottom surface of the tank housing recess 17a (see Figure 17(b)).

[0335] This configuration makes it easier to extend the drain pipe 18d from the urea water tank 18 to the front of the fuel tank 17 via the pipe housing recess 17c.

[0336] Furthermore, the tractor 1 is further equipped with a urea water pump 19 that supplies urea water from the urea water tank 18 to an exhaust gas purification device 40 that purifies the exhaust gas of the engine 3, and the urea water tank 18 has a pump housing recess 18b that houses at least a part of the urea water pump 19 (see Figure 19(b)).

[0337] By configuring it in this way, the pump housing recess 18b can secure space for installing the urea water pump 19, thus saving space.

[0338] Furthermore, the drain pipe 18d is connected to a different part (the lower surface) of the urea water tank 18 than the pump housing recess 18b (see Figure 17(b)).

[0339] This configuration prevents the drain pipe 18d from interfering with the urea water pump 19.

[0340] Furthermore, the tractor 1 is further equipped with a cover member 100 that covers the urea water tank 18 and the drain pipe 18d (see Figures 15 and 16).

[0341] With this configuration, the cover member 100 can protect the urea water tank 18 and the drain pipe 18d.

[0342] Furthermore, the cover member 100 has a cover recess 101d that is recessed toward the urea water tank 18, and the supply port 18c for supplying urea water to the urea water tank 18 is positioned in the cover recess 101d so as to be exposed to the outside of the cover member 100 (see Figures 15 and 16).

[0343] This configuration allows the cover recess 101d to protect the replenishment port 18c. Furthermore, since the replenishment port 18c is exposed to the outside through the cover recess 101d, the urea solution can be replenished without removing the cover member 100, making it easier to replenish the urea solution.

[0344] Furthermore, the urea water tank 18 is positioned on the opposite side of the supercharger 21 from the engine 3 in the left-right direction (see Figures 3 and 15).

[0345] This configuration makes it possible to suppress the deterioration of the urea solution in the urea solution tank 18. More specifically, the side opposite the turbocharger 21 with respect to the engine 3 is relatively far from the turbocharger 21, so it is less likely to become hot when the work vehicle is running. In claim 9, by arranging the urea solution tank 18 on the side opposite the turbocharger 21, it is possible to suppress the urea solution in the urea solution tank 18 from becoming hot when the work vehicle is running, thereby suppressing the deterioration of the urea solution.

[0346] In this embodiment, the tractor 1 is one form of a work vehicle.

[0347] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment comprises a fuel tank 17 for storing fuel, and support bases 20 positioned on the left and right outer sides of the vehicle body on which the fuel tank 17 is mounted and which support both the left and right sides (see Figure 20).

[0348] By configuring it in this way, the support base 20 can be firmly supported by supporting both the left and right sides of the support base 20.

[0349] Furthermore, the left and right inner portions (left end) of the support base 20 are supported by a housing member (clutch housing 6) that houses the clutch (see Figure 20).

[0350] With this configuration, the accommodating member (clutch housing 6) can be used to support the left and right inner sides of the support base 20.

[0351] Furthermore, the left and right outer portions (right end) of the support base 20 are supported by the cabin support member 13 that supports the cabin 12 (see Figure 20).

[0352] With this configuration, the cabin support member 13 can be used to support the left and right outer sides of the support base 20.

[0353] Furthermore, the cabin support member 13 is positioned above the support base 20, and the left and right outer portions (right end) of the support base 20 are supported by the cabin support member 13 via extension members 90 that extend upward from the left and right outer portions of the support base 20 (see Figure 20).

[0354] With this configuration, the support base 20 can be supported by the cabin support member 13 via the extension member 90.

[0355] Furthermore, the support base 20, the extension member 90, and the cabin support member 13 are formed to surround the lower surface, left and right outer sides, and top surface of the fuel tank 17 (see Figure 20).

[0356] By configuring it in this way, the support base 20, the extension member 90, and the cabin support member 13 are formed in a shape that surrounds the fuel tank 17, thereby providing strong support for the support base 20.

[0357] Furthermore, the tractor 1 is further equipped with a urea water pump 19 that supplies urea water to an exhaust gas purification device 40 that purifies the exhaust gas of the engine 3, and the support base 20 supports the urea water pump 19 at a position higher than the mounting surface 20a of the fuel tank 17 (see Figure 16).

[0358] This configuration allows the urea solution pump 19 to be supported using the support base 20. Furthermore, since the mounting surface 20a is less likely to get in the way during maintenance of the urea solution pump 19, maintenance of the urea solution pump 19 can be made easier.

[0359] Furthermore, the tractor 1 according to this embodiment is one form of a work vehicle. Also, the clutch housing 6 according to this embodiment is one form of a housing member.

[0360] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment comprises a fuel tank 17 for storing fuel, a urea water tank 18 for storing urea water, and a band member (front band member 82) that surrounds the outer periphery of the fuel tank 17 and the urea water tank 18 and fixes the fuel tank 17 and the urea water tank 18 to a fixing member (see Figures 17 and 18).

[0361] By configuring it in this way, the fuel tank 17 and the urea water tank 18 can be fixed together by surrounding and securing them with band members (front band member 82). This simplifies the structure for fixing the fuel tank 17 and the urea water tank 18.

[0362] Furthermore, the urea water tank 18 is positioned above the fuel tank 17 (see Figure 17).

[0363] This configuration makes it difficult for fuel to enter the urea water tank 18.

[0364] Furthermore, the band member (front band member 82) is oriented horizontally and has a pair of flat portions 82a that sandwich the fuel tank 17 and the urea water tank 18. The width of the portion of the fuel tank 17 sandwiched by the pair of flat portions 82a is the same as the width of the portion of the urea water tank 18 sandwiched by the pair of flat portions 82a. In this embodiment, as shown in Figure 18, the band member (front band member 82) is provided so as to surround the bottom surface of the pump housing recess 17b and the bottom surface of the band mounting recess 17d of the fuel tank 17. Therefore, the left-right width W17 from the bottom surface of the pump housing recess 17b to the bottom surface of the band mounting recess 17d corresponds to the width of the portion of the fuel tank 17 sandwiched by the pair of flat portions 82a. Furthermore, in this embodiment, since the protruding portion 18a is surrounded by a band member (front band member 82), the left-right width W18a of the protruding portion 18a corresponds to the width of the portion (protruding portion 18a) of the urea water tank 18 that is sandwiched between a pair of flat portions 82a.

[0365] This configuration makes it easier to secure the fuel tank 17 and the urea water tank 18 with the band member (front band member 82). More specifically, since the band member can be wrapped around the fuel tank 17 and the urea water tank 18 (the portion surrounded by the flat portion 82a) in a flush state, it becomes easier to align each tank and wrap the band member around them.

[0366] Furthermore, the width of the portion of the urea water tank 18 sandwiched between the pair of flat portions 82a (the left-right width W18a of the protruding portion 18a) is more than half of the width of the urea water tank 18 from one end to the other in the direction perpendicular to the flat portions 82a (left-right direction) at the same height as the portion sandwiched between the pair of flat portions 82a (see Figure 19(b)).

[0367] By configuring it in this way, the width of the portion of the urea water tank 18 enclosed by the pair of flat portions 82a (the left-right width W18a of the protruding portion 18a) can be made relatively large, thereby ensuring the strength of the urea water tank 18.

[0368] Furthermore, the fixing member includes a support base 20 on which the fuel tank 17 is placed, and the pair of flat portions 82a are attached to the support base 20 (see Figure 18).

[0369] With this configuration, the band member (front band member 82) can be fixed using the support base 20.

[0370] Furthermore, the urea water tank 18 has a protruding portion 18a that extends in a predetermined direction (rearward), and the band member (front band member 82) is provided so as to surround the outer circumference of the protruding portion 18a (see Figures 17 and 18).

[0371] By configuring it in this way, the urea water tank 18 can be fixed in place by attaching a band member (front band member 82) to the protruding portion 18a.

[0372] Furthermore, the tractor 1 is further equipped with a urea water pump 19 that supplies urea water from the urea water tank 18 to an exhaust gas purification device 40 that purifies the exhaust gas of the engine 3, and at least a portion of the band member (front band member 82) overlaps with the urea water pump 19 in a side view (see Figure 17(a)).

[0373] By configuring it in this way, the urea water pump 19 and the band member (front band member 82) can be placed side by side, reducing the front-to-back space required, thus saving space.

[0374] Furthermore, the urea water tank 18 has a pump housing recess 18b that houses at least a portion of the urea water pump 19 (see Figure 19(b)).

[0375] By configuring it in this way, the pump housing recess 18b can secure space for installing the urea water pump 19, thus saving space.

[0376] Furthermore, the tractor 1 is further provided with a cover member 100 that covers the urea water tank 18, and the cover member 100 has a cover recess 101d that is recessed toward the urea water tank 18, and a supply port 18c for supplying urea water to the urea water tank 18 is positioned in the cover recess 101d so as to be exposed to the outside of the cover member 100 (see Figures 15 and 16).

[0377] This configuration allows the cover recess 101d to protect the replenishment port 18c. Furthermore, since the replenishment port 18c is exposed to the outside through the cover recess 101d, the urea solution can be replenished without removing the cover member 100, making it easier to replenish the urea solution.

[0378] Furthermore, the urea water tank 18 is positioned on the opposite side of the supercharger 21 from the engine 3 in the left-right direction (see Figures 3 and 15).

[0379] This configuration suppresses the deterioration of the urea solution in the urea solution tank 18. More specifically, the side opposite the turbocharger 21, with the engine 3 in between, is relatively far from the turbocharger 21 and therefore does not easily become hot when the tractor 1 is running. In this embodiment, by arranging the urea solution tank 18 on the opposite side of the turbocharger 21, it is possible to suppress the urea solution in the urea solution tank 18 from becoming hot when the tractor 1 is running, thereby suppressing the deterioration of the urea solution.

[0380] The tractor 1 according to this embodiment is one form of a work vehicle. Furthermore, the front band member 82 according to this embodiment is one form of a band member.

[0381] Furthermore, as described above, the tractor 1 (work vehicle) according to this embodiment has a first case (DPF case 41a) and a second case (SCR case 42a) arranged facing in the front-rear direction, and is equipped with an exhaust gas purification device 40 for purifying exhaust gas discharged from the engine 3, and a first recess (lower recess 41e of the DPF case 41a, recess 42b of the SCR case 42a) is formed at the front end of at least one of the first case or the second case (see Figures 10(c) and 14).

[0382] By configuring it in this way, other components (such as pipes) can be placed using the first recess (lower recess 41e, recess 42b), thus saving space.

[0383] Furthermore, the first case (DPF case 41a) collects particulate matter in the exhaust gas discharged from the engine, and the second case (SCR case 42a) purifies nitrogen oxides in the exhaust gas.

[0384] With this configuration, other components can be arranged by utilizing the first recess formed in the first case (DPF case 41a) for collecting particulate matter in the exhaust gas, or the second case (SCR case 42a) for purifying nitrogen oxides in the exhaust gas.

[0385] Furthermore, the first recesses (lower recesses 41e and 42b) are formed in the first case (DPF case 41a) and the second case (SCR case 42a), respectively (see Figures 10(c) and 14).

[0386] By configuring it in this way, other components can be arranged using the first recesses (lower recess 41e, recess 42b) formed in the first case (DPF case 41a) and the second case (SCR case 42a), respectively, thus saving space.

[0387] Furthermore, the first case (DPF case 41a) and the second case (SCR case 42a) are arranged side by side in the left-right direction (see Figure 12).

[0388] By configuring the system in this way, the first case (DPF case 41a) and the second case (SCR case 42a) can be placed side by side, reducing the vertical space required to install the first and second cases. This allows for space savings.

[0389] Furthermore, the first recess (lower recess 41e) has an inclined surface 41f that slopes downward towards the rear and faces downward towards the front (see Figure 10(c)).

[0390] This configuration allows the inclined surface 41f to guide air downward and rearward. As a result, the airflow to the member located below and rearward of the first recess (lower recess 41e) can be improved.

[0391] Furthermore, the first case (DPF case 41a) has a second recess (upper recess 41d) into which a first nitrogen oxide sensor 62 for detecting the concentration of nitrogen oxides in the exhaust gas is attached (see Figure 10(c)).

[0392] By configuring it in this way, the first nitrogen oxide sensor 62 can be placed using the second recess (upper recess 41d), thus saving space.

[0393] Furthermore, the tractor 1 is further equipped with an exhaust pipe 45 that is connected to the second case (SCR case 42a) and guides the exhaust gas after it has been purified by the exhaust gas purification device 40, and to which a second nitrogen oxide sensor 63 for detecting the concentration of nitrogen oxides in the exhaust gas is attached (see Figure 10(a)).

[0394] By configuring it in this way, the second nitrogen oxide sensor 63 can be placed using the exhaust pipe 45.

[0395] Furthermore, the first case (DPF case 41a) has a third recess (first left recess 41b) into which a temperature sensor 64 for detecting the temperature of the exhaust gas is attached (see Figure 10(a)).

[0396] By configuring it in this way, the temperature sensor 64 can be placed using the third recess (first left recess 41b), thus saving space.

[0397] Furthermore, the tractor 1 according to this embodiment is one form of a work vehicle. Also, the DPF case 41a according to this embodiment is one form of the first case. Also, the SCR case 42a according to this embodiment is one form of the second case. Also, the lower recess 41e of the DPF case 41a and the recess 42b of the SCR case 42a according to this embodiment are one form of the first recess. Also, the upper recess 41d according to this embodiment is one form of the second recess. Also, the first left recess 41b according to this embodiment is one form of the third recess.

[0398] Although embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention as described in the claims.

[0399] For example, in the above embodiment, a tractor 1 was used as an example of a work vehicle, but other agricultural vehicles, construction vehicles, industrial vehicles, etc., may also be used.

[0400] Furthermore, the configuration of each component (shape, size, number, arrangement, etc.) described in the above embodiment is not limited and can be changed as desired.

[0401] For example, in this embodiment, as shown in Figure 3, the radiator 22, oil cooler 23, condenser 24, and intercooler 25 are arranged in the engine compartment R from rear to front. However, the placement of the radiator 22 and other components is not limited to this. The placement of the radiator 22 and other components may be appropriately changed, for example, depending on the width. For example, if the width W25 of the intercooler 25 is greater than the width W24 of the condenser 24, the condenser 24 may be placed in front of the intercooler 25.

[0402] In this embodiment, the oil cooler 23 and condenser 24 are configured to slide (see Figures 5 and 6), but the sliding cooling equipment is not limited to this. For example, the intercooler 25 may be configured to slide.

[0403] Furthermore, the configuration of the exhaust gas purification device 40 (see Figure 9) is just one example and can be modified as appropriate. For example, the exhaust gas purification device 40 in this embodiment includes a DPF 41 and an SCR 42, but the exhaust gas purification device 40 may also include other equipment different from that in this embodiment, or some of the equipment in this embodiment may be omitted.

[0404] Furthermore, although the DPF case 41a is provided with a plurality of recesses (such as the first left recess 41b) (see Figure 10), the shape of the DPF case 41a is not limited to this embodiment and can be changed as appropriate. For example, it is possible to omit some of the recesses in this embodiment or to change the position of the recesses.

[0405] Furthermore, although the support member 50 is configured to support the connector 61a shown in Figure 8, the electrical components supported by the support member 50 are not limited to the connector 61a, and it is possible to support various electrical components related to the exhaust gas purification device 40.

[0406] Furthermore, although the fuel tank 17 is provided with a plurality of recesses (such as the tank housing recess 17a) (see Figure 19), the shape of the fuel tank 17 is not limited to this embodiment and can be changed as appropriate. For example, some of the recesses in this embodiment can be omitted or their positions can be changed.

[0407] Furthermore, although the urea water tank 18 is provided with a protrusion 18a and a pump housing recess 18b (see Figure 19), the shape of the urea water tank 18 is not limited to this embodiment and can be changed as appropriate. For example, the protrusion 18a or the pump housing recess 18b in this embodiment can be omitted, or the position of the protrusion 18a, etc., can be changed.

[0408] Furthermore, although the front band member 82 is fixed to the support base 20 (see Figure 18), the member to which the front band member 82 is fixed (fixing member) is not limited to the support base 20. For example, the front band member 82 may be fixed to the clutch housing 6 or the like.

[0409] Furthermore, although the front band member 82 is formed in an inverted U-shape when viewed from the front (see Figure 18), the shape of the front band member 82 is not limited to this embodiment, as long as it is a shape that can surround the fuel tank 17, etc. For example, the front band member 82 may be formed in a rectangular ring shape when viewed from the front.

[0410] This invention can be applied to work vehicles.

[0411] 1 Tractor 3 Engine 3b Cooling fan 4 Bonnet 17 Fuel tank 17a Tank housing recess 17c Piping housing recess 18 Urea water tank 18d Drain pipe 19 Urea water pump 20 Support base 22 Radiator 22a Fan shroud 23 Oil cooler 24 Condenser 27 Cooler connection piping 40 Exhaust gas purification device 41a DPF case 41e Lower recess 42a SCR case 42b Recess 44 Connecting pipe 50 Support member 70 Pivot point 82 Upper band member

Claims

1. A work vehicle comprising: an exhaust gas purification device for purifying exhaust gases discharged from an engine; an intercooler for cooling compressed air supplied to the engine; and cooler connection piping that at least partially overlaps with the exhaust gas purification device in a side view and connects the engine and the intercooler.

2. The work vehicle according to claim 1, wherein the exhaust gas purification device comprises a first case for collecting particulate matter in the exhaust gas discharged from the engine, and a second case for purifying nitrogen oxides in the exhaust gas, and at least a portion of the cooler connection piping overlaps with the first case and the second case in a side view.

3. The work vehicle according to claim 2, wherein the portion of the cooler connection piping that overlaps with the first case and the second case in a side view, and the first case and the second case overlap with the engine in a plan view.

4. The work vehicle according to claim 3, wherein at least a portion of the cooler connection piping overlaps with the engine in a top view and a side view.

5. The work vehicle according to any one of claims 2 to 4, wherein the first case and the second case are arranged with their longitudinal directions facing the front-to-back direction and are arranged side by side in the left-to-right direction.

6. The work vehicle according to claim 5, wherein the portion of the cooler connection piping that overlaps with the first case and the second case in a side view is arranged in the left-right direction between the axis of the first case and the axis of the second case along the longitudinal direction.

7. The work vehicle according to any one of claims 2 to 4, wherein a recess is formed in at least one of the first case or the second case, and the cooler connection piping is arranged to pass through the recess.

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