Tractor

Abstract

The tractor's front-to-rear length will be made more compact. [Solution] The vehicle comprises a traveling body 2 equipped with an engine, front wheels 3 and rear wheels 4 supporting the traveling body 2, a step 10 for getting on and off a control section on the traveling body 2, a fuel tank 11 for supplying fuel to the engine, an aftertreatment device for purifying exhaust gas from the engine, and a urea water tank 51 for storing a reducing agent to be supplied to the aftertreatment device. At least a portion of the urea water tank 51 and a first portion of the fuel tank 11 are disposed on either the left or right side of the traveling body 2, between the front wheel 3 and the step 10. The fuel tank 11 has a second portion that extends rearward from the first portion, passing inside the urea water tank 51 in the vehicle width direction.

Description

[Technical Field]

[0001] The present invention relates to an agricultural tractor, and more particularly to a tractor equipped with an after-treatment device that removes particulate matter, nitrogen oxides, and the like contained in the engine exhaust gas. [Background technology]

[0002] Conventionally, a technology has been known in which a case incorporating a diesel particulate filter (hereinafter referred to as a DPF case) and a case incorporating a selective catalytic reduction catalyst (hereinafter referred to as an SCR case) are provided in the exhaust path of a diesel engine as aftertreatment devices (which may also be called exhaust gas purification devices), and exhaust gas emitted from the diesel engine is introduced into both cases for purification treatment (see, for example, Patent Documents 1 and 2).

[0003] When using selective catalytic reduction (SCR) to remove nitrogen oxides from exhaust gas, a reducing agent (such as urea water) must be supplied. Therefore, when installing an SCR denitration system on a tractor, space is naturally required not only for the SCR case but also for the reducing agent tank. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-203753 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-74267 Summary of the Invention [Problem to be solved by the invention]

[0005] In prior art tractors, a pair of left and right fuel tanks are allocated to the left and right midway between the front and rear of the traveling body, and the reducing agent tank is located in front of the left fuel tank. In other words, the left fuel tank and the reducing agent tank are arranged side by side in front and behind. For this reason, even if it is desired to increase the capacity of the left fuel tank, for example, there is a natural limit due to the length of the tractor from front to back, and depending on its shape, it may be necessary to sacrifice the size of the control section (cabin) or the steps, etc.

[0006] The present invention has as its technical object the provision of a compact tractor that has been improved upon in consideration of the above-mentioned current situation. [Means for solving the problem]

[0007] A tractor according to one embodiment includes a traveling body having an engine mounted thereon, front and rear wheels supporting the traveling body, a step for accessing a control section on the traveling body, a fuel tank for supplying fuel to the engine, an aftertreatment device for purifying exhaust gas from the engine, and a reducing agent tank for storing reducing agent to be supplied to the aftertreatment device. At least a portion of the reducing agent tank and a first portion of the fuel tank are disposed on either the left or right side of the traveling body, between the front wheel and the step. The fuel tank has a second portion extending rearward from the first portion, passing inside the reducing agent tank in the vehicle width direction. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a left side view of the tractor. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a plan view of the traveling body of the tractor. [Figure 6] FIG. 2 is a front view showing the internal structure of the tractor. [Figure 7] FIG. 2 is a perspective view showing a urea water piping system. [Figure 8] FIG. 4 is a rear view showing the support structure of the cabin. [Figure 9] FIG. 2 is a front view showing the arrangement of the left tank and the urea water tank. [Figure 10] FIG. 2 is a left side view showing the arrangement of the left tank. [Figure 11] FIG. 2 is a plan view showing the layout of the urea water tank. [Figure 12] FIG. 2 is a perspective view of the mounting structure for the urea water tank as viewed from the left rear. [Figure 13] FIG. 2 is a perspective view showing the front shape of the urea water tank as viewed diagonally from the front left. [Figure 14] FIG. 2 is a left side view of the left tank and the urea water tank. [Figure 15] FIG. 2 is a right side view of the left tank and the urea water tank. [Figure 16] FIG. 2 is a plan view of the left tank and the urea water tank. [Figure 17] FIG. 2 is a front view of the left tank and the urea water tank. [Figure 18] FIG. 2 is a rear view of the left tank and the urea water tank. [Figure 19] FIG. 2 is a bottom view of the left tank and the urea water tank. [Figure 20] FIG. 2 is a perspective view of the left tank and the urea water tank as viewed from diagonally front left. [Figure 21] FIG. 2 is a perspective view of the left tank and the urea water tank as viewed from the rear right. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention will be described below with reference to the drawings. First, the structure of a tractor 1 in this embodiment will be described with reference to FIGS. 1 to 6. The traveling body 2 of the tractor 1 in this embodiment is supported by a pair of left and right front wheels 3 and a pair of left and right rear wheels 4 as a traveling section. The tractor 1 is configured to travel forward and backward by driving the rear wheels 4 and the front wheels 3 with a common rail diesel engine 5 (hereinafter simply referred to as the engine) mounted at the front of the traveling body 2 as a power source. The engine 5 is covered by a hood 6. A cabin 7 (which can also be called a control section) is installed on the top surface of the traveling body 2. Inside the cabin 7, a driver's seat 8 and a control handle 9 are arranged, which are used to steer the front wheels 3 left and right by steering. Steps 10 for an operator to get on and off are provided on the left and right lower left sides of the cabin 7. A fuel tank 11 that supplies fuel to the engine 5 is installed below the bottom of the cabin 7.

[0010] The traveling vehicle body 2 includes a front bumper 12, an engine frame 14 having a front axle case 13, and left and right vehicle frames 15 detachably fixed to the rear of the engine frame 14. Front axles 16 rotatably protrude outward from both left and right ends of the front axle case 13. Front wheels 3 are attached to both left and right ends of the front axle case 13 via the front axles 16. A transmission case 17 is connected to the rear of the vehicle frame 15 for transmitting rotational power from the engine 5 to the four front and rear wheels 3, 3, 4, 4 with appropriate speed change. The left and right front wheels 3 are covered above by left and right front fenders 26. The left and right front fenders 26 are supported on the left and right ends of the top surface of the front axle case 13.

[0011] A tank frame 18, which is a rectangular frame plate in bottom view and protrudes outward to the left and right, is bolted to the underside of the left and right vehicle frames 15 and the transmission case 17. In this embodiment, the fuel tank 11 is divided into two, left and right halves. The left and right fuel tanks 11 are mounted on the upper surfaces of the left and right protruding portions of the tank frame 18. That is, the pair of left and right fuel tanks 11 are disposed on the left and right midway between the front and rear of the traveling vehicle body 2. The tank frame 18 extends to the right, and a battery 50 is disposed in the extended portion on the right side of the tank frame 18. One of the steps 10 is fixed to the extended portion on the right side of the tank frame 18. Left and right rear axle cases 19 are attached to the left and right outer surfaces of the transmission case 17 so as to protrude outward to the left and right. Left and right rear axles 20 are rotatably inserted into the left and right rear axle cases 19. Rear wheels 4 are attached to the transmission case 17 via the rear axles 20. The left and right rear wheels 4 are covered above by left and right rear fenders 21.

[0012] A hydraulic lifting mechanism 22 that raises and lowers a work machine (not shown) such as a rotary tiller is detachably attached to the upper rear surface of the transmission case 17. The work machine is connected to the rear of the transmission case 17 via a three-point link mechanism consisting of a pair of left and right lower links 23 and a top link 24. A PTO shaft 25 that transmits PTO driving force to the work machine protrudes rearward from the rear side of the transmission case 17.

[0013] As shown in FIGS. 5 to 8, the exhaust path of the engine 5 is provided with a first case 31 (which may be referred to as a DPF case) and a second case 32 (which may be referred to as an SCR case) as aftertreatment devices. The aftertreatment device removes particulate matter (such as soot) and nitrogen oxides (NOx) contained in the exhaust gas of the engine 5 and discharges the purified exhaust gas to the outside. In this embodiment, the first case 31 houses an oxidation catalyst and a soot filter (not shown). The second case 32 houses an SCR catalyst for urea selective catalytic reduction and an oxidation catalyst (not shown). The first case 31 is mounted on top of the engine 5 in a position along the crankshaft direction (front-rear direction in this embodiment). The second case 32 is disposed on the lower right side of the front of the cabin 7 in a vertical position so that exhaust gas flows from bottom to top.

[0014] The exhaust inlet side of a purification outlet pipe 33 that is longitudinal in the front-to-rear direction is connected to the exhaust outlet side of the first case 31. A bellows tube section 34 for vibration absorption is provided midway along the length of the purification outlet pipe 33. The exhaust inlet side (upper end side) of a urea mixing pipe 35 is connected to the exhaust outlet side of the purification outlet pipe 33. The urea mixing pipe 35 is generally L-shaped, extending from below to above on the front right side of the cabin 7 and bending in a direction away from the engine 5 below the cabin 7. The exhaust outlet side (lower end side) of the urea mixing pipe 35 is connected to the lower left side of the second case 32. The joint between the exhaust outlet side of the purification outlet pipe 33 and the exhaust inlet side of the urea mixing pipe 35 is connected to the engine 5 via a flange. The exhaust outlet side of the purification outlet pipe 33 and the exhaust inlet side of the urea mixing pipe 35 are supported by the engine 5. The underside of the second case 32 is connected to a right front support base 96 (described later) via a case support bar 48. The exhaust gas that has passed through the first case 31 is introduced into the second case 32 via the purification outlet pipe 33 and the urea mixing pipe 35.

[0015] A urea water injection unit 36 ​​is attached to the upper end side of the urea mixing pipe 35. Urea water (reducing agent) from a urea water tank 51 (reducing agent tank) described below is supplied from the urea water injection unit 36 ​​into the urea mixing pipe 35, and the urea water is hydrolyzed and mixed as ammonia in the exhaust gas flowing from the first case 31 to the second case 32. Note that instead of urea water, other reducing agents, such as anhydrous ammonia or ammonia water, can also be used.

[0016] An assist bar 38 is provided on the front right side of a box-shaped cabin frame 37 that constitutes the cabin 7. A vertically long tail pipe 39 that discharges exhaust gas to the outside is connected to the assist bar 38 at multiple points. The tail pipe 39 is supported by the assist bar 38. The exhaust inlet side of the tail pipe 39 is connected to the exhaust outlet side (top side) of the second case 32. Exhaust gas from the engine 5 is purified by the first case 31 and the second case 32 and is discharged outside the aircraft through the tail pipe 39.

[0017] In the above configuration, first, the oxidation catalyst and soot filter in the first case 31 reduce particulate matter (PM), carbon monoxide (CO), and hydrocarbons (HC) in the exhaust gas from the engine 5. Next, inside the urea mixing pipe 35, the exhaust gas passing through the first case 31 is mixed with urea water from the urea water injection unit 36, and the SCR catalyst and oxidation catalyst in the second case 32 reduce nitrogen oxides (NOx) in the exhaust gas mixed with the urea water as ammonia. Then, the exhaust gas passing through the second case 32 is discharged outside the aircraft from the tailpipe 39.

[0018] As shown in FIGS. 4 and 5 , the fuel tank 11 includes a left tank 11L and a right tank 11R, which are located under the cabin 7 and inward (toward the vehicle frame 15) of the pair of left and right steps 10 and the rear wheel 4. The left tank 11L and the right tank 11R are disposed on either side of the pair of vehicle frames 15. That is, the front portion of the left tank 11L is disposed between the left vehicle frame 15 and the left step 10, while the rear portion is disposed between the left vehicle frame 15 and the left rear wheel 4. Similarly, the front portion of the right tank 11R is disposed between the right vehicle frame 15 and the right step 10, while the rear portion is disposed between the right vehicle frame 15 and the right rear wheel 4. The left tank 11L and the right tank 11R have different capacities. The left and right tanks 11L and 11R are connected to each other via fuel communication pipes (not shown) at the lower left and right inward-facing side surfaces of the tanks. The large-capacity left tank 11L is shaped to protrude forward beyond the left step 10 in front of the cabin 7. In other words, the left tank 11L is shaped to surround the right and front sides of the left step 10.

[0019] The fuel tank 11 is placed on a tank frame 18 that protrudes outward to the left and right from the underside of the vehicle frame 15, and is fixed in place with bands 40. The tank frame 18 is formed into a rectangular frame plate shape in bottom view, and is made up of a front cross-rail frame 41 that is fixed by hanging from the left and right vehicle frames 15, a rear cross-rail frame 42 that is fixed to the underside of the transmission case 17, and left and right tank mounting plates 43 that are fixed at both ends of each of the cross-rail frames 41, 42. The left and right tank mounting plates 43 have substantially the same shape as the bottom shapes of the left tank 11L and the right tank 11R, respectively, and are fixed with bands 40 at two locations, front and rear, of each of the left and right tanks 11L, 11R, that are placed on the top surfaces of the left and right tank mounting plates 43.

[0020] In this way, the tank frame 18 is composed of a pair of front and rear horizontal rail frames 41, 42 that extend laterally below the left and right aircraft frames 15, and a pair of left and right tank mounting plates 43 that are installed front and rear on both the left and right sides of the front and rear horizontal rail frames 41, 42. The left and right fuel tanks 11L, 11R are mounted and fixed on the left and right tank mounting plates 43, respectively.

[0021] As shown in Figures 1 to 5, steps 10 for an operator to board and disembark are provided at the left and right lower portions of the cabin 7. As shown in Figure 8, the left step 10 is erected on the left end of the front cross-rail frame 41. A left front support base 96 is attached to the upper end of the left step 10. In this embodiment, the left step 10 is composed of two tiers of step members 44, 45, one above the other, and front and rear side plate members 46 connected to these step members 44, 45. The lower tier of step member 45 is fastened to the left end of the front cross-rail frame 41. The left front support base 96 is fastened to the upper ends of the front and rear side plate members 46. A front portion of the left tank 11L fits into the space surrounded by the left front support base 96, the left step 10, and the front cross-rail frame 41. Meanwhile, the lower tier of step member 45 constituting the right step 10 is fastened to the right end of the front cross-rail frame 41. The right step 10 is made up of the lower step member 45 described above and an upper step member 44 connected to the lower right part of the cabin frame 37.

[0022] A vertical support 47 is erected at a portion closer to the right of the front cross-rail frame 41. A right front support base 96 is attached to the upper end of the vertical support base 47. The front side of the right tank 11R fits into the space enclosed by the right front support base 96, the vertical support 47, and the front cross-rail frame 41. The front bottom of the cabin 7 is supported in a vibration-isolating manner on the upper surfaces of the left and right front support bases 96 via vibration-isolating rubber bodies 98. A case support bar 48 extending horizontally from left to right is fastened to the front side of the right front support base 96. The underside of the second case 32 is fastened to the upper right outer surface of the case support bar 48. Therefore, the second case 32 is supported by the right front support base 96 via the case support bar 48. A rear support base 97 is fastened to the middle of the left and right width of the upper surfaces of the left and right rear axle cases 19, which extend horizontally in the left-right direction. The rear bottom of the cabin 7 is supported in a vibration-isolating manner on the upper surfaces of the left and right rear support bases 97 via vibration-isolating rubber bodies 99. Therefore, the traveling machine body 2 supports the cabin 7 in a vibration-isolating manner via a plurality of vibration-isolating rubber bodies 98, 99.

[0023] A battery base 49 is attached to the vertical support 47 at its upper and lower midpoints. A battery 50 is mounted on the battery base 49. In this embodiment, the battery 50 is located below the second case 32, and the lower tread member 45 of the right step 10 is located to the right and outside of the battery 50.

[0024] As shown in Figures 9 to 11, a tank recess 52 for accommodating an aqueous urea tank 51 (reducing agent tank) is formed in the lower front part of the left tank 11L. The aqueous urea tank 51 is box-shaped and accommodates aqueous urea (aqueous urea solution for selective catalytic reduction). When the aqueous urea tank 51 is accommodated in the tank recess 52, the upper front part 11LF of the left tank 11L and the aqueous urea tank 51 are positioned vertically side by side. This makes it possible to secure both the space for arranging the aqueous urea tank 51 and the capacity of the left tank 11L, and therefore the capacity of the entire fuel tank 11, without increasing the longitudinal length of the tractor 1 or sacrificing the size of the cabin 7 (operating section) or the step 10.

[0025] An auxiliary frame 53 extending toward the left tank 11L, which has a tank recess 52, is provided on the traveling body 2. In this case, one end of the auxiliary frame 53 is fastened to the left engine frame 14. A flat tank base 54 is fixed to the other end of the auxiliary frame 53. The tank base 54 is fastened to the left end of the front cross-rail frame 41 that constitutes the tank frame 18.

[0026] Insert nuts (not shown) are embedded in the bottom and rear surfaces of the urea water tank 51. With the urea water tank 51 housed in the tank recess 52, the bottom surface of the urea water tank 51 is fastened to the tank base 54 with bolts and insert nuts, and the rear surface of the urea water tank 51 is fastened to the front plate member 46 of the left step 10 with bolts and insert nuts (see Figures 4 and 12). The urea water tank 51 is stably fixed and supported by the left step 10 and the auxiliary frame 53.

[0027] A fuel filler cylinder 55 protrudes upward from the upper surface of the upper front portion 11LF of the left tank 11L. A supply cylinder 56 protrudes diagonally upward and outward from the left outer surface of the urea water tank 51. In this way, the fuel filler cylinder 55 and the supply cylinder 56 protrude in different directions, so that fuel and urea water can be replenished from the same side (left side) of the traveling body 2, while making it difficult to confuse fuel and urea water. In particular, in this embodiment, the fuel filler cylinder 55 for the fuel that is replenished more frequently is positioned above the urea water supply cylinder 56, thereby significantly reducing the risk of supplying fuel to the supply cylinder 56 of the urea water tank 51 by mistake.

[0028] As shown in Figure 13, a recessed portion 57 is formed in the front of the urea water tank 51 to avoid interference with the left front wheel 3 (including the left front fender 26). In this embodiment, the recessed portion 57 is recessed forward in a concave shape that follows the outer circumferential shape of the left front wheel 3 (including the left front fender 26). Due to the presence of the recessed portion 57 in the front of the urea water tank 51, there is no risk of the left front wheel 3 interfering with the urea water tank 51 even when the front wheels 3, 3 are steered left or right. This makes it possible to position the urea water tank 51 as close as possible to the left front wheel 3, thereby enabling the tractor 1 to be made more compact in terms of the longitudinal length, etc.

[0029] 7 and 8, the engine 5 (cooling water pump) and the urea water injection unit 36 ​​are in communication with each other via a cooling water feed pipe 101 and a cooling water return pipe 102. One ends of the cooling water feed pipe 101 and the cooling water return pipe 102 are connected to the engine 5 (cooling water pump), and the other ends of the cooling water feed pipe 101 and the cooling water return pipe 102 are connected to the urea water injection unit 36. The cooling water heated by the engine 5 is sent from the cooling water feed pipe 101 to the cooling water return pipe 102 and passes through the urea water injection unit 36, thereby preventing the urea water from freezing in the urea water injection unit 36. The cooling water that has passed through the urea water injection unit 36 ​​is returned to the engine 5 (cooling water pump) via the cooling water return pipe 102.

[0030] A cooling water supply pipe 103 branches off from the middle of the cooling water feed pipe 101. The cooling water supply pipe 103 is connected to a tank sensor unit 58 attached to the urea water tank 51. In this case, an upwardly concave recessed portion 51a is formed on the top surface of the urea water tank 51. An upwardly facing protrusion 51b on the top surface of the urea water tank 51 abuts against the bottom surface of the front upper portion 11LF of the left tank 11L via an L-shaped buffer material 59. The tank sensor unit 58 described above is detachably attached to the top opening formed in the recessed portion 51a of the urea water tank 51. The tank sensor unit 58 also functions as a lid for the top opening. The tank sensor unit 58 is connected to the cooling water supply pipe 103, the cooling water recovery pipe 104, the urea water feed pipe 105, the urea water return pipe 106, etc.

[0031] The cooling water supply pipe 103 and the cooling water recovery pipe 104 are connected inside the urea water tank 51. The cooling water recovery pipe 104 is connected to the engine 5 (cooling water pump). The cooling water heated by the engine 5 is sent from the cooling water supply pipe 103 to the cooling water recovery pipe 104 and passes through the urea water tank 51, thereby preventing the urea water from freezing inside the urea water tank 51. The cooling water that has passed through the urea water tank 51 is returned to the engine 5 (cooling water pump) via the cooling water recovery pipe 104.

[0032] The other ends of the urea water feed pipe 105 and the urea water return pipe 106, one end of which is connected to the tank sensor unit 58, are connected to a urea water supply device 107 (supply module, reducing agent supply device) that supplies the urea water in the urea water tank 51 to the urea water injection unit 36 ​​of the urea mixing pipe 35. The urea water supply device 107 is connected to the urea water injection unit 36 ​​via a urea water injection pipe 108. The urea water supply device 107 sucks up the urea water in the urea water tank 51 through the urea water feed pipe 105, supplies the urea water to the urea water injection unit 36 ​​through the urea water injection pipe 108, and sprays the urea water into the urea mixing pipe 35. Excess urea water is returned to the urea water tank 51 through the urea water return pipe 106.

[0033] 9 to 11, a urea water supply device 107 is disposed between the traveling body 2 and the urea water tank 51. Although detailed illustration is omitted, the urea water supply device 107 includes a urea water pump that pumps the urea water in the urea water tank 51, and a drive motor that drives the urea water pump. The urea water supply device 107 supplies the urea water in the urea water tank 51 to the urea water spraying section 36 of the urea mixing pipe 35, whereby the urea water is sprayed from the urea water spraying section 36 into the urea mixing pipe 35. In this case, the urea water supply device 107 is disposed between the left body frame 15 and the urea water tank 51 and on the tank base 54. The dead space between the traveling body 2 (left body frame 15) and the urea water tank 51 can be effectively utilized as an arrangement space for the urea water supply device 107. The urea water piping system can be connected over a short distance from the urea water tank 51 to the urea water injection portion 36 of the urea mixing pipe 35 via the urea water supply device 107.

[0034] As shown in Figures 10 and 11, one end of a breather pipe 109 for releasing pressure inside the urea water tank 51 is connected to the tank sensor unit 58 of the urea water tank 51. The other end of the breather pipe 109 is bifurcated. One of the bifurcated pipes, pipe portion 109a, extends upward and opens. The other bifurcated pipe portion 109b extends downward and opens at the left-right center of the traveling body 2 (left-right inward of the front and rear wheels 3, 4). Therefore, when urea water is supplied, outside air is introduced through the upward pipe portion 109a of the breather pipe 109, thereby maintaining a constant pressure inside the urea water tank 51. For example, even if the urea water tank 51 is shaken by vibration of the engine 5 or unevenness in the field and the urea water gets into the breather pipe 109, the urea water will spill out from the downward pipe portion 109b of the breather pipe 109, thereby preventing the upward pipe portion 109a from being blocked by deposition of urea, etc. Outside air can be introduced smoothly and reliably through the breather pipe 109.

[0035] It goes without saying that the positional relationship between the tank recess 52, the urea water tank 51, and the second case 32 is not limited to that in the embodiment, and may be reversed left and right. In this case, the positional relationship between the battery 50, the left and right fuel tanks 11, the step 10, etc. will also be reversed left and right.

[0036] The configuration of each part in the present invention is not limited to the illustrated embodiment, and various modifications are possible within the scope of the present invention.

[0037] <Notes on the invention> The present invention relates to a tractor comprising a running body on which an engine is mounted, a pair of left and right front and rear wheels supporting the running body, steps for getting on and off a control section on the running body, a fuel tank for supplying fuel to the engine, an aftertreatment device for purifying exhaust gas from the engine, and a reducing agent tank for storing reducing agent to be supplied to the aftertreatment device, wherein the reducing agent tank is positioned on either the left or right side of the running body and in front of the steps, the front wheels are positioned in front of the reducing agent tank, and a recess is formed in the front surface of the reducing agent tank.

[0038] Furthermore, in the tractor of the reference example, the recessed portion is recessed in a forward-facing concave shape that conforms to the outer circumferential shape of the front wheel 3.

[0039] In the tractor of the above-mentioned reference example, a fender may be provided on the front wheel, and the recessed portion may be formed in front of the reducing agent tank on the side where the fender is provided.

[0040] In the tractor of the above-described reference example, a fuel filler tube of the fuel tank may be provided in front of the step and above the recessed portion of the reducing agent tank.

[0041] In the tractor of the above-described reference example, a supply tube for the reducing agent tank may be provided on the left and right outer side surfaces of the reducing agent tank, rearward of the recessed portion of the reducing agent tank, and facing diagonally upward and outward.

[0042] In the present invention, the above-described configuration allows the tractor to be made compact.

[0043] According to the tractor of the above-mentioned reference example, there is no risk of the front wheels interfering with the reducing agent tank, so the reducing agent tank can be disposed as close as possible to the front wheels. [Explanation of symbols]

[0044] 1 Tractor 2 Running body 3 Front wheels 5. Diesel engine 7 Cabin 10 steps 11 Fuel tank 11L left tank 11LF Upper front part of left tank 11R right tank 18 Tank frame 26 Front fender 31 Case 1 32 Case 2 35 Urea mixing tube 36 Urea water injection part 39 Tailpipe 51 Urea water tank 52 Tank recess 55 Fuel Tank 56 Supply Cylinder 57 Recessed part 58 Tank sensor section 107 Urea water supply equipment

Claims

1. A running body equipped with an engine, Front wheels and rear wheels supporting the traveling machine body; A step for getting on and off the control unit on the traveling machine body; a fuel tank for supplying fuel to the engine; an aftertreatment device that purifies exhaust gas from the engine; a reducing agent tank that stores a reducing agent to be supplied to the aftertreatment device, The fuel tank is A first portion disposed on either the left or right side of the traveling machine body and between the front wheel and the step; a second portion extending rearward from the first portion and disposed inside the step in the aircraft width direction, At least a portion of the reducing agent tank overlaps with the first portion in the vertical direction, The first portion protrudes outward in the fuselage width direction from the control unit in a plan view. Tractor.

2. At least a portion of the fuel tank is located higher than the top end of the step.

2. The tractor of claim 1.

3. The front wheels are provided with fenders, at least a portion of the reducing agent tank and the first portion of the fuel tank are disposed between the fender and the step; 3. A tractor according to claim 1 or 2.

4. a tank recess for accommodating the reducing agent tank is formed in the first portion of the fuel tank; A tractor according to any one of claims 1 to 3.

5. At least a part of the second portion of the fuel tank is located inside the rear wheel in the vehicle width direction. A tractor according to any one of claims 1 to 4.

6. The fuel tank has a shape that surrounds the inside and front side of the step in the aircraft width direction. A tractor according to any one of claims 1 to 5.

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