Tractor

Abstract

To easily install even a large reducing agent pump in a tractor including an exhaust emission control device for purifying exhaust gas discharged by an engine by using a reducing agent.SOLUTION: A reducing agent pump 60 for supplying a reducing agent to an exhaust emission control device 25 is provided on a lateral outer side of a vehicle body frame 1. A pump cover 61 for covering the reducing agent pump 60 is provided.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a tractor. [Background technology]

[0002] As shown in Patent Document 1, there is a tractor equipped with an engine, an exhaust gas purification device (second exhaust gas purification device) that purifies the exhaust gas emitted by the engine using a reducing agent, and a reducing agent pump that supplies a reducing agent to the exhaust gas purification device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-51493 Summary of the Invention [Problem to be solved by the invention]

[0004] In the past, reducing agent pumps have been installed in the engine compartment. However, if the required reducing agent pump is large, it is difficult to install it due to the difficulty in securing the installation space. Also, depending on the engine compartment, measures to make it larger may be necessary.

[0005] The present invention provides a tractor that can easily be equipped with a large reducing agent pump. [Means for solving the problem]

[0006] The tractor according to the present invention comprises: The vehicle is equipped with an engine, an exhaust gas purification device that purifies exhaust gas emitted by the engine using a reducing agent, and a reducing agent pump that supplies the reducing agent.The reducing agent pump is provided on the outer side of the vehicle frame, and a pump cover that covers the reducing agent pump is provided.

[0007] According to this configuration, the reducing agent pump is provided on the outer lateral side of the body frame, where a large installation space is easily available, so no special measures are required to obtain the installation space. Even if the reducing agent pump is provided on the outer lateral side of the body frame, the reducing agent pump is protected by the pump cover, making it easy to install even a large reducing agent pump.

[0008] In the present invention, A boarding type driving section and a boarding / alighting step for getting on and off the driving section are provided, The reducing agent pump is preferably located inside the step for getting on and off the vehicle.

[0009] According to this configuration, the step for getting on and off is located laterally outward of the reducing agent pump, so that the step for getting on and off can be used as a guard member for the reducing agent pump to protect the reducing agent pump at low cost.

[0010] In the present invention, It is preferable that a maintenance portion is formed at the bottom of the reducing agent pump, and that the pump cover be separable into a lower cover portion that covers the reducing agent pump from below, and an upper cover portion.

[0011] According to this configuration, by separating and removing the lower cover part from the upper cover part, the lower cover part's covering of the maintenance part is released, allowing the maintenance part to be operated without the need to remove the reducing agent pump. By not having to take the time to remove the reducing agent pump, maintenance work can be performed efficiently.

[0012] In the present invention, It is preferable that the pump holding member that holds the reducing agent pump is provided with a bottom plate portion that is positioned between the bottom portion and the lower cover portion and faces the bottom portion, and that a maintenance port is opened in the portion of the bottom plate portion that faces the maintenance portion.

[0013] With this configuration, by separating and removing the lower cover part from the upper cover part, the lower cover part's cover on the maintenance port in the bottom plate part is released, allowing the maintenance part to be operated through the maintenance port, eliminating the need to remove the reducing agent pump.By eliminating the need to remove the reducing agent pump, maintenance work can be performed efficiently.

[0014] In the present invention, It is preferable that a tank holding member is provided that is supported by the vehicle body frame and that holds a reducing agent tank, and that the pump holding member is connected to the tank holding member.

[0015] With this configuration, the tank holding member is used as a connecting member that connects the pump holding member to the vehicle body frame, so there is no need to provide the pump holding member with a connecting portion for connecting the pump holding member to the vehicle body frame.By not providing a connecting portion on the pump holding member, the pump holding member can be simplified and made lighter. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a side view of the entire tractor as seen from the left side. [Figure 2] FIG. 2 is a plan view showing a motor unit, an installation portion for a reducing agent tank, and an installation portion for a reducing agent pump. [Figure 3] FIG. 2 is a side view showing a motor unit, an installation portion for a reducing agent tank, and an installation portion for a reducing agent pump. [Figure 4] FIG. 2 is a side view showing the control unit and the unit case with the cover case portion removed. [Figure 5] FIG. 2 is a plan view showing a control unit and a unit case in cross section. [Figure 6] FIG. 2 is a plan view showing a tank holding member and a pump holding member. [Figure 7] FIG. 2 is a perspective view showing a tank holding member and a tank cover in a disassembled state. [Figure 8] FIG. 4 is a rear view showing the reducing agent pump and the pump cover in cross section. [Figure 9] FIG. 2 is a perspective view showing a reducing agent pump, a pump holding member, and a pump cover in a removed state. DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings. In the following description, with respect to the tractor body, the direction of arrow F shown in Figures 1, 2, 3, and 5 is referred to as the "front direction of the body," the direction of arrow B shown in Figures 1, 2, 3, and 5 is referred to as the "rear direction of the body," the direction of arrow U shown in Figures 1 and 3 is referred to as the "upward direction of the body," the direction of arrow D shown in Figures 1 and 3 is referred to as the "downward direction of the body," the direction of arrow L shown in Figures 2 and 5 is referred to as the "leftward direction of the body," and the direction of arrow R shown in Figures 2 and 5 is referred to as the "rightward direction of the body." The left-right direction of the body corresponds to the width direction of the body.

[0018] [Overall configuration of the tractor] As shown in Figures 1 and 2, the tractor has a body 4 equipped with a body frame 1, a pair of steerable and drivable front wheels 2, and a pair of drivable rear wheels 3. A power unit 6 equipped with an engine 5 and the like is formed at the front of the body 4. A driver's section 7 is formed at the rear of the body 4. The driver's section 7 is equipped with a driver's seat 8, a steering wheel 9 for steering the front wheels 2, and a cabin 10 that covers the passenger space. A boarding and alighting step 11 is provided on the outer side of the driver's section 7 for use in getting on and off the driver's section 7. A connecting mechanism 13 is provided at the rear of the body 4 for connecting various working implements, such as a rotary tiller (not shown), so that they can be raised and lowered.

[0019] 2 and 3, the vehicle body frame 1 is composed of an engine 5, a transmission case 14 extending rearward from the rear of the engine 5, and a front frame 15 extending forward from below the engine 5. A pair of left and right front wheels 2 are steerably and drivably attached to ends in the vehicle width direction of a front-wheel drive case 16 held by the front frame 15, and are held by the front frame 15 via the front-wheel drive case 16. A pair of left and right rear wheels 3 are drivably held at ends of rear-wheel drive cases 17 provided on both sides of the rear of the transmission case 14. The output of the engine 5 is introduced into a driving transmission (not shown) located inside the transmission case 14, transmitted from the driving transmission to the rear wheels 3 via the left and right rear-wheel drive cases 17, and then transmitted from the driving transmission to the front wheels 2 via a transmission shaft 18 located between the transmission case 14 and the front-wheel drive case 16 and the front-wheel drive case 16.

[0020] The connecting mechanism 13 is provided at the rear of the transmission case 14 .

[0021] [About the driving part] 2 and 3, the motor section 6 is provided with an engine room 19. The engine room 19 is formed by an engine bonnet 20 and the like. The engine room 19 is provided with the engine 5, a radiator 21 for cooling the engine, a rotary fan 22 for cooling the engine, an air cleaner 23 for the engine, a first exhaust gas purification device 24, a second exhaust gas purification device 25, and the like. The engine 5 is a diesel engine.

[0022] [Regarding the engine bonnet] As shown in Fig. 3, the rear of the engine bonnet 20 is connected via a pivot shaft 20d to a bonnet holding frame 37 that faces upright in the vehicle body and is provided at the rear of the engine compartment 19. The bonnet holding frames 37 are erected on the vehicle body frame 1 on both lateral sides of the rear of the engine compartment 19. As shown in Figs. 3 and 5, the pivot shaft 20d is attached to the bonnet holding frame 37 by providing a shaft support member 38 that supports both ends of the pivot shaft 20d in the vehicle width direction with bent ends 38a, and connecting the shaft support member 38 to the upper part of the bonnet holding frame 37 via a first connecting member 39a that runs along the underside of the shaft support member 38 and a second connecting member 39b that connects the first connecting member 39a to the bonnet holding frame 37. The engine bonnet 20 is held by a bonnet holding frame 37 so that it can swing up and down to be opened and closed, with a pivot axis P of the pivot shaft 20d extending in the vehicle width direction as a swing fulcrum. The engine bonnet 20 is equipped with a top plate 20a, left and right side plate portions 20b extending downward from both sides of the top plate 20a, and a front plate portion 20c connected to the front end of the top plate 20a and the front end of the left and right side plate portions 20b.

[0023] [Regarding engine cooling] 2 and 3, the engine 5 is provided in the rear of the engine compartment 19. The rotary fan 22 is provided forward of the engine 5, and the radiator 21 is provided forward of the rotary fan 22. The rotary fan 22 is driven by the output of the engine 5, and the rotating rotary fan 22 introduces cooling air from the front to the rear of the radiator 21 and supplies it to the radiator 21. The engine coolant located in the radiator 21 is cooled by the cooling air, and the cooled engine coolant is supplied to the engine 5, thereby cooling the engine 5.

[0024] [About the air cleaner] 2 and 3, the air cleaner 23 is provided forward of the radiator 21 and is connected to the engine 5 via an air intake pipe 27. In this embodiment, the air cleaner 23 is connected to a supercharger (not shown) provided in the engine 5.

[0025] [Regarding the first and second exhaust gas purification devices] 2 and 3, the first exhaust gas purification device 24 and the second exhaust gas purification device 25 are provided above the engine 5. In this embodiment, the first exhaust gas purification device 24 and the second exhaust gas purification device 25 are arranged in the vehicle width direction with their respective longitudinal directions aligned with the vehicle front-rear direction.

[0026] An exhaust gas inlet (not shown) of the first exhaust gas purification device 24 and an exhaust gas discharge part (not shown) of the engine 5 are connected by a first exhaust gas introduction pipe 28. In this embodiment, the exhaust gas introduction part of the first exhaust gas purification device 24 is located at the bottom at the rear of the first exhaust gas purification device 24. In the first exhaust gas purification device 24, exhaust gas discharged by the engine 5 is introduced into the device by the first exhaust gas introduction pipe 28, and the introduced exhaust gas is subjected to a purification process.

[0027] More specifically, in the first exhaust gas purification device 24, diesel particulates contained in the introduced exhaust gas are collected by a collection filter (not shown), and a purification process is performed to reduce the diesel particulates.

[0028] 2 and 3 , the exhaust gas inlet of the second exhaust gas purification device 25 and the exhaust gas outlet of the first exhaust gas purification device 24 are connected by a second exhaust gas inlet pipe 29. An exhaust pipe 30 extends from the exhaust gas outlet of the second exhaust gas purification device 25. In this embodiment, the exhaust gas outlet of the first exhaust gas purification device 24 is located on one of both lateral sides in the front part of the first exhaust gas purification device 24, on the lateral side opposite the side facing the second exhaust gas purification device 25, and the exhaust gas inlet of the second exhaust gas purification device 25 is located on one of both lateral sides in the front part of the second exhaust gas purification device 25, on the lateral side opposite the side facing the first exhaust gas purification device 24. The second exhaust gas introduction pipe 29 is installed so as to extend from the exhaust gas ejection portion of the first exhaust gas purification device 24 to the side of the first exhaust gas purification device 24, behind the first exhaust gas purification device 24 and the second exhaust gas purification device 25, and to the side of the second exhaust gas purification device 25, before reaching the exhaust gas introduction portion of the second exhaust gas purification device 25. In the second exhaust gas purification device 25, exhaust gas emitted by the engine 5 is introduced into the device through the second exhaust gas introduction pipe 29 and the like, and the introduced exhaust gas is subjected to purification treatment.

[0029] More specifically, a reducing agent injection unit (not shown) is formed in the second exhaust gas introduction pipe 29. In this embodiment, the reducing agent injection unit is formed in a portion of the second exhaust gas introduction pipe 29 that passes laterally of the second exhaust gas purification device 25 in the longitudinal direction of the vehicle. In the second exhaust gas purification device 25, exhaust gas discharged from the engine 5 and purified by the first exhaust gas purification device 24 is introduced into the device through the second exhaust gas introduction pipe 29, and a reducing agent is injected into the second exhaust gas introduction pipe 29 by the reducing agent injection unit, thereby supplying the reducing agent to the exhaust gas introduced into the second exhaust gas purification device 25 and purifying the exhaust gas with the reducing agent. More specifically, in this embodiment, the reducing agent is urea water. When the urea water is injected into the exhaust gas, ammonia is generated by thermal decomposition and hydrolysis. Ammonia then chemically reacts with the nitrogen oxides contained in the exhaust gas to reduce the nitrogen oxides contained in the exhaust gas, thereby reducing the ammonia to nitrogen and water. The purified exhaust gas is ejected into the exhaust pipe 30 and is discharged outside the vehicle body through the exhaust pipe 30.

[0030] [Regarding the control unit and unit case] The exhaust gas purification process by the second exhaust gas purification device 25 is performed while purification control is executed based on the control unit 31 so as to increase the amount of nitrogen oxides reduced.

[0031] 3, the control unit 31 is provided in the engine compartment 19 and housed in a unit case 32. In this embodiment, the control unit 31 is located at the rear of the engine compartment 19, laterally outward of the vehicle body than the engine 5, and is therefore susceptible to the influence of engine cooling airflow flowing from the rotary fan 22 toward the rear of the vehicle body between the engine 5 and the engine bonnet 20. In this embodiment, the control unit 31 is provided laterally outward of the engine 5 on the left side of the vehicle body, but it can also be provided laterally outward of the engine 5 on the right side of the vehicle body. The control unit 31 receives detection results from a nitrogen oxide sensor (not shown) that detects the nitrogen oxide content of the exhaust gas purified by the second exhaust gas purification device 25, and causes an engine control unit or a computer for controlling the exhaust gas purification device to control the purification process based on the detection results received. Alternatively, the control unit 31 may perform purification process by adjusting the amount of reducing agent injected by the reducing agent injection unit based on the detection results from the nitrogen oxide sensor.

[0032] 5, the unit case 32 is attached to a bonnet holding frame 37. The bonnet holding frame 37 is used as a holding member for the unit case 32.

[0033] 4 and 5, the unit case 32 includes a case body 33 and a lid case portion 34. The control unit 31 is attached to the case body 33. Case holding members 35 are connected to the case body 33 at two locations, one above the other, and the other below the other. The two case holding members 35 are connected to holding arms 36 extending laterally outward from a bonnet holding frame 37, and the case body 33 is attached to the bonnet holding frame 37 via the case holding members 35 and the holding arms 36. The case body 33 is detachably connected to the case holding members 35 with connecting bolts. The case holding members 35 are connected to the holding arms 36 by welding. Resin covers 26 are attached to the rear portions of the two upper and lower case holding members 35. The resin covers 26 cover the gap between the engine bonnet 20 and the front wall of the cabin 10. The case body 33 and the lid case portion 34 may be configured to take into consideration other components within the engine bonnet 20. For example, as shown in FIGS. 3 and 4, the case body 33 and the lid case portion 34 are structured so that the upper left sides of the case body 33 and the lid case portion 34 are cut away so as not to come into contact with the second exhaust gas introduction pipe 29.

[0034] The lid case portion 34 is configured to open and close the case body 33. More specifically, as shown in Fig. 5 , the lid case portion 34 is placed over the case body 33 from the lateral outer side of the vehicle body, and connecting portions 34a formed at two locations, top and bottom, of the lid case portion 34 are detachably connected to the holding portions 33a of the case body 33 using connecting holes 34b with connecting bolts, thereby attaching the lid case portion 34 to the case body 33 and closing the case body 33. The lid case portion 34 is opened by releasing the connection of the lid case portion 34 to the case body 33 with the connecting bolts and removing it from the case body 33 to the lateral outer side of the vehicle body.

[0035] As shown in Figures 4 and 5, the case main body 33 is provided with a main body peripheral wall 33b that rises from the peripheral edge of the case main body 33 toward the outside of the vehicle body. The lid case portion 34 is provided with a lid peripheral wall 34c that rises from the peripheral edge of the lid case portion 34 toward the case main body. The lid case portion 34 provided with the lid peripheral wall 34c can provide waterproofing so that the control unit 31 does not break down even if water is splashed on it from above. As an example, as shown in Figure 4, by not providing the lid peripheral wall 34c in the lower left portion of the lid case portion 34 (to the left of the connecting portion 34a formed on the lower right side of the lid case portion 34), water, straw, weeds, and the like that have entered the unit case 32 can be more easily removed. 5, when the case main body 33 is closed by the lid case portion 34, the main body peripheral wall portion 33b and the lid peripheral wall portion 34c are configured to overlap in the inward and outward directions of the unit case 32 at the front of the unit case 32. Even if dust is blown into the unit case 32 from the front due to the influence of cooling air from the rotary fan 22, the main body peripheral wall portion 33b and the lid peripheral wall portion 34c reduce the intrusion of the dust into the unit case. Furthermore, even if the cooling air from the rotary fan 22 flows into the unit case 32 from the front as hot air after cooling the engine, the main body peripheral wall portion 33b and the lid peripheral wall portion 34c reduce the intrusion of the hot air into the unit case. In this embodiment, the lid peripheral wall portion 34c is located outside the main body peripheral wall portion 33b, and the main body peripheral wall portion 33b and the lid peripheral wall portion 34c overlap, but the lid peripheral wall portion 34c may also be located inside the main body peripheral wall portion 33b, and the main body peripheral wall portion 33b and the lid peripheral wall portion 34c may overlap.

[0036] [Regarding the reducing agent tank and reducing agent pump] As shown in FIGS. 1, 2, and 3 , a reducing agent tank 40 that stores the reducing agent to be supplied to the reducing agent jetting portion, and a reducing agent pump 60 that extracts the reducing agent from the reducing agent tank 40 and supplies it to the reducing agent jetting portion are provided on the outer lateral side of the body frame 1. The reducing agent tank 40 is covered by a tank cover 41, and the reducing agent pump 60 is covered by a pump cover 61. The tank cover 41 and the pump cover 61 can respectively protect the reducing agent tank 40 or the reducing agent pump 60 from flying stones and the like. In this embodiment, the reducing agent tank 40 and the reducing agent pump 60 are provided on the outer left side of the body frame 1, but they can also be provided on the outer right side of the body frame 1. In this embodiment, the reducing agent tank 40 and the reducing agent pump 60 are disposed inside a step 11 for getting on and off, and the step 11 is utilized as a guard member for the reducing agent tank 40 and the reducing agent pump 60.

[0037] The reducing agent tank 40 is held by a tank holding member 42 shown in FIG. 6. The tank holding member 42 is supported by the body frame 1. As shown in FIG. 6, the tank holding member 42 is supported by the body frame 1 in such a way that a support arm 43 projects outward laterally from the transmission case 14 of the body frame 1, and the tank holding member 42 is connected to the support arm 43 at a rear portion 42a. The tank holding member 42 is connected to the support arm 43 with a connecting bolt. The support arm 43 is connected to a cabin support frame 44 (see FIG. 3) that projects outward laterally from the transmission case 14 and supports the cabin 10 from below, via a first connecting member 45 and a second connecting member 46 (see FIG. 3), thereby reinforcing the connection of the support arm 43 to the transmission case 14. The first connecting member 45 is formed in a gate shape when viewed in the front-rear direction so as to surround a fuel tank 47 for the engine (see FIG. 2), and stands up from a bent portion 43a of the support arm 43. The second connecting member 46 connects an upper portion of the first connecting member 45 to the cabin support frame 44. An intermediate portion of the support arm 43 in the vehicle width direction is connected to the rear portion of the transmission case 14 via a connecting rod 48, thereby reinforcing the connection of the support arm 43 to the transmission case 14.

[0038] As shown in FIGS. 6 and 7, the tank holding member 42 has a tank mounting portion 49 and a frame portion 50 that stands up from the periphery of the tank mounting portion 49.

[0039] In the tank holding member 42, the reducing agent tank 40 is placed on the tank mounting portion 49, and the reducing agent tank 40 is pressed from above by a fixing member (not shown) to be fixed to the tank mounting portion 49, thereby holding the reducing agent tank 40 by the tank holding member 42.

[0040] 6 and 7, the tank mounting portion 49 is made up of two mounting plates 49a and a connecting plate 49b connecting one end of the two mounting plates 49a, and an opening 51 is provided in the tank mounting portion 49 at a position facing a drain cock (not shown) provided at the bottom of the reducing agent tank 40. The opening 51 is rectangular. The drain cock can be opened and closed from below the tank holding member 42 through the opening 51.

[0041] 6 and 7 , the tank cover 41 is provided with a bottom cover portion 52 that is placed on the tank mounting portion 49 of the tank holding member 42 and covers the reducing agent tank 40 from below, a lateral cover portion 53 that is positioned inward of the reducing agent tank 40 in the vehicle width direction and covers the reducing agent tank 40 from the vehicle frame side, and a front cover portion 54 that is positioned forward of the reducing agent tank 40 and covers the reducing agent tank 40 from the front. The bottom cover portion 52 is provided with a front vertical cover portion 52a that is positioned between the reducing agent tank 40 and the front cover portion 54, a rear vertical cover portion 52b that covers the reducing agent tank 40 from the rear, and a lateral vertical cover portion 52c that is positioned between the reducing agent tank 40 and the lateral cover portion 53. The front cover portion 54 is held by the vehicle body frame 1 by connecting a connecting portion 54a provided at an upper portion to the vehicle body frame 1. The side cover portions 53 are held by the front cover portion 54, which is connected to a holding portion 54b of the front cover portion 54 by connecting screws. An opening 55 is provided in the bottom cover portion 52 at a location facing a drain cock provided at the bottom of the reducing agent tank 40. The opening 55 in the bottom cover portion 52 is circular and smaller than the opening 51 in the tank mounting portion 49. The drain cock can be opened and closed from below the tank holding member 42 via the opening 51 in the tank holding member 42 and the opening 55 in the tank cover 41. The front cover portion 54 is provided with a cutout portion through which the reducing agent supply tube 40a (see FIG. 3) extending forward from the reducing agent tank 40 is inserted.

[0042] The reducing agent tank 40 is held by the tank holding member 42 in a state where it is fixed to a tank mounting portion 49 of the tank holding member 42 on the outer left side of the body frame 1 and inside the boarding / exiting step 11, and is supported by the transmission case 14 of the body frame 1 via the tank holding member 42 and a support arm 43. The reducing agent tank 40 is held by the tank holding member 42 in a state where it is covered by a tank cover 41. Even when the reducing agent tank 40 remains held by the tank holding member 42 and covered by the tank cover 41, the reducing agent can be drained from the reducing agent tank 40 by operating the drain cock from below the tank holding member 42 via the opening 51 of the tank mounting portion 49 and the opening 55 of the bottom cover portion 52.

[0043] As shown in FIG. 8, the reducing agent pump 60 is held by a pump holding member 62. The pump holding member 62 is supported by the body frame 1. As shown in FIG. 6, the pump holding member 62 is supported by the body frame 1 by connecting a front portion 62a of the pump holding member 62 to a holding portion 42b of the tank holding member 42. The pump holding member 62 is connected to the tank holding member 42 by a connecting bolt. The pump holding member 62 is supported by the transmission case 14 of the body frame 1 via the tank holding member 42 and a support arm 43. The tank holding member 42 is utilized as a member that connects the pump holding member 62 to the body frame 1.

[0044] 6 and 9, the pump holding member 62 has a bottom plate portion 63, a horizontal vertical plate portion 64 rising from a portion of the peripheral edge of the bottom plate portion 63 that is located at the lateral end of the bottom plate portion 63 on the vehicle body frame side, and a front vertical plate portion 65 rising from a portion of the peripheral edge of the bottom plate portion 63 that is located at the front end of the bottom plate portion 63. The rising height of the front vertical plate portion 65 is set lower than the rising height of the horizontal vertical plate portion 64.

[0045] As shown in FIG. 8, in the pump holding member 62, the reducing agent pump 60 is disposed above the bottom plate portion 63, and connecting bolts inserted through mounting holes in mounting portions 60a formed on the upper and lower parts of the reducing agent pump 60 engage with the horizontal / vertical plate portion 64, and the mounting portions 60a are tightened and fixed to the horizontal / vertical plate portion 64 by the connecting bolts, thereby holding the reducing agent pump 60 by the pump holding member 62.

[0046] As shown in FIGS. 6 and 9 , a first maintenance port 66 and a second maintenance port 67 are opened in the bottom plate portion 63. In this embodiment, the first maintenance port 66 and the second maintenance port 67 are notched, but they may be through-holes of various shapes, such as circular, elliptical, or rectangular. The first maintenance port 66 is opened in a portion of the bottom plate portion 63 facing a maintenance portion 68 (see FIGS. 8 and 9 ) formed on the bottom of the reducing agent pump 60. Work on the maintenance portion 68 can be performed through the first maintenance port 66 from below the pump holding member 62. In this embodiment, the maintenance portion 68 is for inserting and removing a filter (not shown) for cleaning or replacing it, but it is not limited to this and may be a maintenance portion for a pump component other than the filter. The second maintenance port 67 is opened in a portion of the bottom plate portion 63 facing a terminal portion 69 (see FIG. 9 ) provided on the side of the reducing agent pump 60. From below the pump holding member 62, work on the terminal portion 69 can be performed through the second maintenance port 67, for example, to lock or unlock the locking mechanism of a connector (not shown) connected to the terminal portion 69.

[0047] 8 and 9, the pump cover 61 includes a lower cover portion 70 and an upper cover portion 71. The lower cover portion 70 and the upper cover portion 71 are configured to be separable.

[0048] 9, the lower cover 70 has a bottom plate 70a, a rear vertical plate 70b rising from a portion of the peripheral edge of the bottom plate 70a that is located at the rear end of the bottom plate 70a, a horizontal vertical plate 70c rising from a portion of the peripheral edge of the bottom plate 70a that is located at the lateral end of the bottom plate 70a on the outer side of the vehicle body, and a front vertical plate 70d rising from a portion of the peripheral edge of the bottom plate 70a that is located at the front end of the bottom plate 70a. Drain holes 70e are opened at multiple locations on the bottom plate 70a.

[0049] As shown in Figures 6 and 8, in the lower cover portion 70, the lower cover portion 70 is placed over the pump holding member 62 from below, and a front connecting portion 72 formed on the front portion of the horizontal vertical plate portion 70c is detachably connected by a connecting bolt to the lower portion of an attachment arm 73 erected on the bottom plate portion 63 of the pump holding member 62, and a rear connecting portion 74 formed on the horizontal end portion of the rear vertical plate portion 70b is detachably connected by a connecting bolt to an attachment portion 75 provided on the bottom plate portion 63 of the pump holding member 62, thereby covering the lower portion of the reducing agent pump 60 with the lower cover portion 70 and holding the lower cover portion 70 with the pump holding member 62.

[0050] 9, the upper cover portion 71 has a front vertical plate portion 71a, a rear vertical plate portion 71b, a horizontal vertical plate portion 71c, and a top plate portion 71d. The top plate portion 71d is formed in an outwardly downwardly sloping state so that it is positioned lower toward the outer lateral sides of the vehicle body.

[0051] As shown in FIG. 8 , in the upper cover portion 71, the upper cover portion 71 is placed over the reducing agent pump 60 from above, the front portion of the horizontal / vertical plate portion 71c is detachably connected to the upper part of the mounting arm 73 by a connecting bolt using the connecting hole 76, and the horizontal end portion at the rear of the top plate portion 71d is detachably connected to a mounting arm 78 extending upward from the horizontal / vertical plate portion 64 of the pump holding member 62 by a connecting bolt using the connecting hole 77, so that the upper cover portion 71 covers the portion of the reducing agent pump 60 that protrudes upward from the lower cover portion 70, and the upper cover portion 71 is held by the pump holding member 62.

[0052] In the pump cover 61, the lower cover portion 70 and the upper cover portion 71 are attached to the pump holding member 62, and the lower cover portion 70 and the upper cover portion 71 are connected by the pump holding member 62 to form the entire pump cover 61, and the pump cover 61 covers the reducing agent pump 60. In this embodiment, when the reducing agent pump 60 is covered by the pump cover 61, the pump cover 61 does not cover the reducing agent pump 60 from the inner side in the vehicle width direction, but the covering of the reducing agent pump 60 from the inner side in the vehicle width direction is performed by the horizontal / vertical plate portions 64 of the pump holding member 62.

[0053] 8, when the reducing agent pump 60 is covered by the pump cover 61, the bottom plate portion 70a of the lower cover portion 70 is positioned below the reducing agent pump 60 and faces the bottom of the reducing agent pump 60, so that the reducing agent pump 60 is covered from below by the lower cover portion 70, and the bottom plate portion 63 of the pump holding member 62 is positioned between the bottom plate portion 70a of the lower cover portion 70 and the bottom of the reducing agent pump 60, so that the first maintenance port 66 and the second maintenance port 67 of the bottom plate portion 63 are covered by the lower cover portion 70. The lower cover portion 70 prevents dust and other particles from entering the reducing agent pump 60 through the first maintenance port 66 and the second maintenance port 67.

[0054] The reducing agent pump 60 is held by a pump holding member 62 on the outer left side of the body frame 1 and inside the getting-in / out step 11, and is supported on a transmission case 14 of the body frame 1 via the pump holding member 62, the tank holding member 42, and the support arm 43. The reducing agent pump 60 is held by the pump holding member 62 while being covered by a pump cover 61. Even if the reducing agent pump 60 remains held by the pump holding member 62, by removing only the lower cover portion 70 of the pump cover 61 from the pump holding member 62, the cover by the lower cover portion 70 of the first maintenance port 66 and the second maintenance port 67 of the pump holding member 62 is released, and work on the maintenance portion 68 can be performed from below the pump holding member 62 via the first maintenance port 66, and work on the terminal portion 69 can be performed from below the pump holding member 62 via the second maintenance port 67.

[0055] [Another embodiment] (1) In the above embodiment, the reducing agent pump 60 is provided on the outer left side of the body frame 1, but it may be provided on the outer right side of the body frame 1.

[0056] (2) In the above embodiment, an example was shown in which the reducing agent pump 60 was provided inside the boarding / alighting step 11, but it may also be provided at a location located forward or rearward of the vehicle body relative to the boarding / alighting step 11.

[0057] (3) In the above embodiment, an example was shown in which the pump cover 61 can be separated into a lower cover portion 70 and an upper cover portion 71, but it may also be one that cannot be separated into the lower cover portion 70 and the upper cover portion 71.

[0058] (4) In the above embodiment, an example was shown in which the first maintenance port 66 was provided in the lower cover portion 70, but the first maintenance port 66 may not be provided.

[0059] (5) In the above embodiment, the maintenance unit 68 is shown as being for a filter, but this is not limited thereto, and the maintenance unit may be for a part of the reducing agent pump 60 other than the filter that requires maintenance.

[0060] (6) In the above embodiment, an example was shown in which the pump holding member 62 was connected to the tank holding member 42, but this is not limited to this, and the pump holding member 62 may be attached to the body frame 1 alone.

[0061] (7) In the above embodiment, an example in which the first exhaust gas purification device 24 is provided is shown, but the first exhaust gas purification device 24 may not be provided.

[0062] (8) In the above embodiment, an example is shown in which rear wheels 3 and a cabin 10 are provided, but it is also possible to provide a mini crawler running device instead of the rear wheels 3, or to provide no cabin 10. [Industrial Applicability]

[0063] The present invention can be applied to a tractor equipped with an exhaust gas purification device that treats exhaust gas with a reducing agent. [Explanation of symbols]

[0064] 1 Body frame 5 Engine 7. Driving Department 11. Steps for boarding and alighting 25 Second exhaust gas purification device (exhaust gas purification device) 42 Tank holding member 60 Reductant pump 61 Pump cover 62 Pump holding member 66 First Maintenance Entrance (Maintenance Entrance) 68 Maintenance Department 70 Lower cover 70a Bottom plate part

Claims

1. The engine and an exhaust gas purification device that purifies exhaust gas emitted by the engine using a reducing agent; a reducing agent pump for supplying a reducing agent; the reducing agent pump is provided laterally outside the vehicle body frame, The tractor is provided with a pump cover that covers the reducing agent pump.

2. A riding type driver's unit, and a step for getting on and off the driving section, 2. The tractor according to claim 1, wherein the reducing agent pump is located inside the step for getting on and off.

3. a maintenance portion is formed at the bottom of the reducing agent pump, 2. The tractor according to claim 1, wherein the pump cover is separable into a lower cover portion that covers the reducing agent pump from below, and an upper cover portion.

4. a pump holding member that holds the reducing agent pump is provided with a bottom plate portion that is positioned between the bottom portion and the lower cover portion and faces the bottom portion, The tractor according to claim 3, wherein a maintenance port is opened in a portion of the bottom plate portion facing the maintenance portion.

5. a tank holding member supported by the vehicle body frame and holding a reducing agent tank; 5. The tractor according to claim 4, wherein the pump holding member is connected to the tank holding member.

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