JP2019069768A - Tractor - Google Patents

Abstract

To provide a work vehicle which enables improvement of heat radiation performance of an exhaust gas processing part disposed at an exterior part of an engine hood.SOLUTION: A tractor includes: a cylindrical exhaust gas processing part 32 which is disposed at an exterior part of one of left and right sides of an engine hood in a vertically standing manner and forms a part of an exhaust gas processing mechanism which performs processing for purifying an exhaust gas of an engine; and a cover 33 which covers an outer peripheral surface of the exhaust gas processing part 32 and has multiple vent holes 33a on a surface opposite to the side facing a front wheel disposed at the front side relative to the exhaust gas processing part 32. Further, the tractor includes: a lifting step 21 which is provided at an exterior part of at least one of left and right sides of a cabin 15 enclosing a cockpit; a urea water pump 65 which is disposed between the lifting step 21 and the cabin 15 and supplies urea water to the exhaust gas processing part 32; and a pump cover 66 which covers a lifting step 21 side surface of the urea water pump 65.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a tractor.

  Conventionally, a work vehicle (for example, an agricultural tractor) includes an exhaust gas treatment mechanism that purifies exhaust gas of an engine by sequentially passing through two exhaust gas treatment units. For example, in the two exhaust gas processing units, one exhaust gas processing unit is disposed inside the bonnet, and the other exhaust gas processing unit is disposed outside the left or right of the bonnet (see, for example, Patent Document 1).

  The exhaust gas processing unit disposed outside the hood may be disposed with the outer surface covered by the cover.

U.S. Pat. No. 7,937,936

  However, in the conventional work vehicle as described above, since the exhaust gas processing unit disposed outside the bonnet is covered by the cover, the heat of the exhaust gas processing unit is not dissipated and is retained inside the cover, and the heat dissipation is improved. It was getting worse.

  This invention is made in view of the above, Comprising: It aims at providing the tractor which can make the heat dissipation of the waste gas processing part arrange | positioned to the exterior of a bonnet favorable.

In order to solve the problems described above and to achieve the object, the tractor according to claim 1 comprises a front wheel, a rear wheel, a cabin surrounding a driver's seat, and an elevation step provided outside at least one of the left and right sides. When,
It has a cylindrical exhaust gas processing unit which is disposed upright on either the left or the right outside of the bonnet and which forms a part of an exhaust gas processing mechanism that purifies the exhaust gas of the engine.
The exhaust gas processing unit is mounted on a plate-like bottom portion provided in front of the cabin, and is disposed in front of the raising and lowering step and at a position behind the front wheel,
A cover having a plurality of ventilating holes is provided on a surface that covers the outer peripheral surface of the exhaust gas processing unit and is opposite to the side facing the front wheel disposed forward of the exhaust gas processing unit.

The tractor according to claim 2 is the tractor according to claim 1, which is disposed at the rear of the exhaust gas processing unit and is disposed in a space between the raising and lowering step and the cabin, and purifies the exhaust gas of the engine. A urea water pump for supplying urea water to the exhaust gas processing unit;
A pump cover is provided to cover a surface of the urea water pump on the elevation step side.

  The tractor according to claim 3 is characterized in that the pump cover (66) has a plurality of vent holes (67) in the tractor according to claim 2.

  The tractor according to claim 4 is characterized in that, in the tractor according to any one of claims 1 to 3, the bottom portion extends from the front of the cabin to the front of the raising and lowering step and is flat.

  According to the tractor according to the first aspect of the present invention, the heat dissipation of the exhaust gas processing unit covered by the cover can be improved by the cover having the vent holes. In addition, even if the cover is provided with the vent holes, it is possible to prevent mud and the like flying from the front wheel side from entering through the vent holes. Further, since the bottom portion supports the exhaust gas processing unit from below, the exhaust gas processing unit can be supported with an appropriate supporting strength. In addition, by arranging the exhaust gas processing unit in front of the raising and lowering step and at a position behind the front wheels, the left and right (right) lower portions of the cabin can be easily seen from the cockpit and visibility from the cockpit 10 is excellent. can do.

  According to the tractor according to claim 2, it is possible to prevent the mud and the like from adhering to the urea water pump.

  According to the tractor of the third aspect, the heat of the urea water pump can be dissipated to the outside by having the plurality of vent holes. That is, the cooling effect of the urea water pump can be enhanced.

  According to the tractor of the fourth aspect, the bottom portion extends from the front of the cabin to the front of the raising / lowering step and can be configured flat to prevent the crop in the field from being damaged. .

FIG. 1 is a schematic left side view of a work vehicle according to an embodiment. FIG. 2 is a front view showing the internal structure of the bonnet. FIG. 3 is a plan view showing the internal structure of the bonnet. FIG. 4 is a perspective view showing the exhaust gas treatment mechanism. FIG. 5 is a perspective view showing a second exhaust gas processing unit and a support member. FIG. 6 is a perspective view showing the support member. FIG. 7 is a perspective view showing a fuel tank and a urea aqueous solution tank. FIG. 8 is a perspective view showing a fuel sub-tank. FIG. 9 is a perspective view showing a fuel pump.

  Hereinafter, an embodiment of a work vehicle according to the present invention will be described in detail based on the drawings. The present invention is not limited by this embodiment. Further, constituent elements in the following embodiments include those that can be easily replaced by persons skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic left side view of the work vehicle 1 according to the embodiment. As shown in FIG. 1, the work vehicle 1 according to the embodiment is an agricultural tractor (hereinafter, the work vehicle is referred to as “tractor”) that performs ground work while traveling by itself in a field or the like. In the following, the forward direction of the tractor 1 as a work vehicle is referred to as the front side (left side in FIG. 1), and the reverse direction of the forward direction is referred to as the rear side (right side in FIG. 1). The orthogonal direction is referred to as the left and right direction, and the vertical direction orthogonal to the front and rear direction of the

  The tractor 1 can transmit the power generated by the engine 7 and decelerated by the main transmission and the auxiliary transmission to the front wheels 4 via the front wheel acceleration switching mechanism. In the tractor 1, when the front wheel acceleration switching mechanism transmits power, the four wheels of the front wheel 4 and the rear wheel 5 are driven by the power transmitted from the engine 7. Further, in the tractor 1, when the front wheel acceleration switching mechanism cuts off the transmission of power, the two wheels of the rear wheel 5 are driven by the power transmitted from the engine 7. That is, the tractor 1 is capable of switching between two-wheel drive and four-wheel drive. Further, a PTO (Power take-off) output shaft 3 on which a working machine such as a rotary can be mounted is disposed at the rear of the machine body 2 of the tractor 1.

  The airframe 2 is attached to the transmission case 8 in which the main transmission system, the auxiliary transmission system, the front wheel acceleration switching mechanism, the PTO conduction portion for transmitting the driving force to the PTO output shaft 3 and the like are housed. The vehicle includes a panel dash 9 and an airframe 12 that supports the cabin 15 and on which an engine 7 and the like are installed. The transmission case 8, the panel dash 9 and the machine frame 12 which constitute the machine body 2 are made of metal. The body frame 12 is roughly divided into a portion supporting the cabin 15 and a portion below the bonnet 6 where the engine 7 and the like are installed.

  The engine 7 is mounted on the airframe frame 12 on the front side of the panel dash 9 and is covered by a bonnet 6. The transmission case 8 is provided from the panel dash 9 to the rear of the airframe 2. A pilot seat 10 is provided at the upper rear of the transmission case 8. Mud fenders 11 are provided on the left and right sides of the pilot seat 10, respectively. The bonnet 6 is rotatably attached to the machine body 2 and is attached so as to open and close the internal space.

  The operator's seat 10 is for the operator to sit when operating the tractor 1 and is surrounded by a cabin 15 supported by the airframe frame 12. A steering handle 13 used to steer the front wheel 4, a display panel for providing various information to the operator, and an operation panel for various operations by the operator are provided in front of the pilot seat 10. The steering wheel 13 is rotatably supported by the steering wheel post 14. In the lower part of the steering wheel post 14, that is, near the foot of the operator when the operator sits in the cockpit 10, in addition to the clutch pedal 20, a brake pedal for braking the rear wheel 5 according to the pedal operation An accelerator pedal that accelerates the fuselage 2 is provided.

  In addition, on the right side of the cockpit 10, there is provided a work implement lifting lever that raises and lowers a working machine such as a rotary mounted on the rear of the tractor 1 up and down. There are provided a main shift lever for performing an operation related to the shift of the main transmission in the above, and an auxiliary shift lever for performing an operation on the auxiliary transmission. The main shift lever operates the main shift, which is a shift of the main shift device, and can switch an automatic shift that automatically performs the main shift and a manual shift that the operator optionally performs. The main transmission lever switches the reduction gear ratio of the main transmission to one of eight speeds in manual transmission. In addition, the auxiliary transmission lever can operate the auxiliary transmission to switch the traveling speed between ultra low speed, low speed, medium speed, high speed and neutral.

  Further, below the cabin 15, a fuel tank 16 for storing fuel supplied to the engine 7 is provided. Further, a urea water tank 17 for storing urea water to be supplied to a second exhaust gas processing unit 32 (see FIG. 2) constituting the exhaust gas processing mechanism 30 described later is provided below the cabin 15. The arrangement of the fuel tank 16 and the urea aqueous solution tank 17 will be described later with reference to FIG.

  Further, the airframe 2 is provided with lifting and lowering steps 21 used when the operator gets on and off the cabin 15 outside at least one of the left and right sides of the cabin 15 (in the present embodiment, the left and right sides of the cabin 15 respectively). . Further, in the airframe 2, a muffler 22 for exhausting the exhaust gas of the cleaned engine 7 to the atmosphere is provided upright in at least one of the left and right sides of the bonnet 6.

  FIG. 2 is a front view showing the internal structure of the hood 6. FIG. 3 is a plan view showing the internal structure of the bonnet 6. In addition, in FIG. 3, the cabin 15 is abbreviate | omitted for convenience of explanation. As shown in FIGS. 2 and 3, an exhaust gas treatment mechanism 30 is provided from the inside to the outside of the bonnet 6 for purifying the exhaust gas of the engine 7 to remove air pollutants in the exhaust gas. Further, the exhaust gas processing mechanism 30 is configured to include two exhaust gas processing units, that is, a first exhaust gas processing unit 31 (see FIG. 3) and a second exhaust gas processing unit 32. The first exhaust gas processing unit 31 is disposed inside the bonnet 6 above the engine 7. The second exhaust gas processing unit 32 is disposed outside either the left or right of the hood 6.

  The exhaust gas processing mechanism 30 has a function of DOC (Diesel Oxidation Catalyst) that causes the first exhaust gas processing unit 31 to efficiently oxidize nitrogen monoxide (NO) in the exhaust gas. Further, the exhaust gas processing mechanism 30 has a function of SCR (Selective Catalytic Reduction) using urea water (NH 3) in the second exhaust gas processing unit 32. In such an exhaust gas treatment mechanism 30, in the DOC, nitrogen monoxide (NO) in the exhaust gas is converted to carbon dioxide (NO2), and in SCR, urea water (NH3) is supplied to nitrogen dioxide (NO2) to achieve carbon dioxide By converting nitrogen (NO2) into water (H2O) and nitrogen gas (N2), nitrogen oxides (NOX) in the exhaust gas are removed. Generally, both DOC and SCR are required to remove a prescribed amount of nitrogen oxide (NOX).

  As shown in FIG. 3, the muffler 22 is provided outside the right side of the hood 6 so as to project from the second exhaust gas processing unit 32 and the second exhaust gas processing unit 32. Further, a urea water tank 17 for storing urea water to be supplied to the second exhaust gas processing unit 32 is disposed outside the side (left side) opposite to the support member 40 of the cabin 15. As described above, the second exhaust gas processing unit 32 is disposed on one of the left and right exteriors of the bonnet 6, and the urea water tank 17 is disposed on the other, so that the balance of the airframe 2 can be improved. Can. In addition, space can be used effectively.

  Further, as shown in FIG. 3, the fuel tank 16 extends over the left and right of the airframe 2. Then, for example, the hydraulic hose 50 for moving the hydraulic pressure toward the front loader is wired from the transmission case 8 to the lower part of the fuel tank 16 by passing the joystick valve 51 provided on the side surface of the fuel tank 16. Thereby, the wiring of the hydraulic hose 50 becomes easy. Further, on the lower surface of the fuel tank 16, a hose insertion portion in which the outer shape is recessed in a notch shape is provided. The hydraulic hose 50 can be suppressed from protruding from the lower surface of the fuel tank 16 by passing the hydraulic hose 50 through the hose insertion portion. Thereby, the wiring of the hydraulic hose 50 becomes easy.

  Next, the configuration of the exhaust gas processing mechanism 30 will be described with reference to FIGS. 4 and 5. FIG. 4 is a perspective view showing the exhaust gas treatment mechanism 30. As shown in FIG. FIG. 5 is a perspective view showing the second exhaust gas processing unit 32 and the support member 40. As shown in FIG. As described above, the exhaust gas processing mechanism 30 includes the first exhaust gas processing unit 31 (DOC) and the second exhaust gas processing unit 32 (SCR). As shown in FIG. 4, the first exhaust gas processing unit 31 is mounted on the engine 7. Exhaust gas of the engine 7 flows into the first exhaust gas processing unit 31. Further, as described above, the first exhaust gas processing unit 31 converts nitrogen monoxide (NO) in the exhaust gas into carbon dioxide (NO2). In addition, the second exhaust gas processing unit 32 is formed in a cylindrical shape, and is supported by a support member 40 described later on either the left or the right outside of the bonnet 6 (the outside on the right side of the bonnet 6 in this embodiment) It is attached upright. The exhaust gas that has been primarily treated by the first exhaust gas processing unit 31 flows into the second exhaust gas processing unit 32. As described above, the second exhaust gas processing unit 32 supplies urea water (NH 3) to nitrogen dioxide (NO 2) to convert nitrogen dioxide (NO 2) into water (H 2 O) and nitrogen gas (N 2). Thereby, nitrogen oxides (NOX) in the exhaust gas are removed. The exhaust gas subjected to the secondary treatment in the second exhaust gas processing unit 32 is discharged from the muffler 22 to the atmosphere.

  The outer periphery of the second exhaust gas processing unit 32 is covered by a heat shielding plate 33. Thus, the heat insulating effect of the second exhaust gas processing unit 32 can be enhanced by the outer periphery being covered by the heat shielding plate 33. Further, a pipe (tail pipe) 34 is connected between the first exhaust gas processing unit 31 and the second exhaust gas processing unit 32. In addition, a front loader bracket 36 (hereinafter simply referred to as a “loader bracket”) to which a front loader is attached between the machine body frame 12 on which the engine 7 is mounted and the support member 40 on which the second exhaust gas processing unit 32 is mounted. ) Is provided. The airframe 12 and the support member 40 are connected using a loader bracket 36. As described above, by providing the existing components to the connection between the airframe 12 and the support member 40, the manufacturing cost can be reduced.

  Further, on the support member 40, an adapter 38 for extracting the hydraulic pressure to the front loader is provided between the second exhaust gas processing unit 32 and the engine 7. Thus, the apparatus (for example, a hydraulic pressure extraction apparatus) provided to another apparatus (for example, a front loader) is provided on the support member 40, so that the structure can be inexpensively manufactured. In addition, space can be used effectively.

  When the machine body frame 12 and the support member 40 are connected by the loader bracket 36, the machine body frame 12 and the support member 40 are temporarily connected in advance by the collar member 37 (see FIG. 5). As shown in FIG. 5, in this case, the support member 40 is attached to the collar member 37 provided to project left or right from the transmission case 8 and the loader bracket 36 is assembled with the machine frame 12 and the support member in the attached state. Fix both sides with 40. Thereafter, the collar member 37 is removed, and the connection between the body frame 12 and the support member 40 by the loader bracket 36 is completed. According to such a connection method, the connection can be performed by a simple operation, whereby the cost for manufacturing can be reduced.

  Here, the second exhaust gas processing unit 32 is disposed outside the left side of the bonnet 6 by being supported by the support member 40. Hereinafter, the configuration of the support member 40 will be described with reference to FIG. FIG. 6 is a perspective view showing the support member 40. As shown in FIG. Note that FIG. 6 shows a state in which the second exhaust gas processing unit 32 and the pipe 34 are removed from the support member 40. As shown in FIG. 6, the support member (support bracket) 40 has a plate-like bottom portion 41 on which the second exhaust gas processing unit 32 is mounted. The bottom portion 41 is formed in a plate shape long to the left and right. In addition, the bottom portion 41 protrudes forward of a portion supporting the cabin 15 of the airframe 12 (hereinafter, this portion is referred to as “airframe frame 12 a”), and the second exhaust gas processing unit 32 is an elevation step. It is arrange | positioned so that it may be put on one side and it may be put on one side (right side in this embodiment) right ahead.

  That is, the second exhaust gas processing unit 32 is placed on the bottom portion 41 so as to be offset to the outer half (in the present embodiment, the right half) viewed from the bonnet 6. Further, at the bottom portion 41, the connection end portion 35 with the second exhaust gas processing portion 32 of the pipe 34 (see FIG. 1) is biased to the inward half (in the present embodiment, the left half) viewed from the bonnet 6. 5) is placed. The support member 40 has a covering portion 42 covering the connection end 35 of the pipe 34 in the left half where the pipe 34 is disposed. The covering portion 42 is provided with a hole having a diameter such that a gap is formed around the connection end 35 when the connection end 35 of the pipe 34 is disposed at the bottom 41. Thereby, since the pipe 34 is not exposed, the aesthetics of the vehicle can be enhanced. Further, the bottom portion 41 is provided with an opening 43 at a position where the connection end 35 of the pipe 34 is disposed. Further, in the support member 40, the bottom portion 41 is fixed to the vehicle body frame 12 a, and the covering portion 42 is suspended and fixed from the lower portion of the cabin 15 by an L-shaped fixing member (rubber mount) 44. Furthermore, the support member 40 is preferably integrally formed of a casting. This can enhance the aesthetics. Furthermore, in addition to the fact that the support member 40 is integral by casting, since the bottom 41 is flat, it is possible to protect the second exhaust gas treating portion 32 and the pipe 34, and to damage the crop in the field. Can be prevented.

  According to the configuration of the tractor 1 as described above, since the support member 40 supports the second exhaust gas processing unit 32 from below, the second exhaust gas processing unit 32 can be supported with an appropriate support strength. Thereby, the support performance of the 2nd exhaust gas processing part 32 can be made favorable. Moreover, since it is a simple structure, the support member 40 can be obtained at low cost. Furthermore, by arranging the second exhaust gas processing unit 32 away from the fuselage 2 to either the left or right (right side), the left and right (right side) lower parts of the cabin 15 can be easily seen from the cockpit 10. Visibility can be improved.

  In addition, since the heat of the pipe 34 disposed in the support member 40 is released from the opening 43 to the outside of the support member 40, the heat can be prevented from remaining in the support member 40. Furthermore, the accumulation of dust and the like on the support member 40 can be prevented.

  In addition, the second exhaust gas processing unit 32 is supported from below by the bottom 41 of the support member 40, and its upper portion is fixed by the fixing plate 45 extending from the bottom 41 (see FIG. 3). Thereby, the second exhaust gas processing unit 32 can be firmly held. In addition, in the second exhaust gas processing unit 32, in order to fix the upper portion to the fixing plate 45, the flange portion of the upper surface of the cover 33 described later is extended upward.

  Further, as described above, the second exhaust gas processing unit 32 is provided with a heat shielding plate (hereinafter, the cover is referred to as “heat shielding plate”) as the cover 33 that covers the outer peripheral surface. The heat shield plate 33 is provided with a plurality of ventilation holes 33a. The ventilation hole 33a is a surface (a surface on the rear side of the heat shielding plate 33) opposite to the side facing the front wheel 4 (see FIG. 1) disposed in front of the second exhaust gas processing unit 32 in the heat shielding plate 33. Provided in). That is, it is preferable not to provide the vent holes 33 a in the front surface of the heat shield plate 33. In addition, the ventilation hole 33a should just avoid the range which sees from the front wheel 4 of the heat shielding plate 33, and faces. Therefore, for example, when the heat shield plate 33 is arranged to be displaced to the left or right as viewed from the front wheel 4, the range in which the ventilation hole 33 a is not provided is more than the case where the heat shield plate 33 is on one straight line You will be displaced to the left or right. In addition, the vent holes 33 a are preferably provided in a range of about two thirds of the rear side of the entire peripheral surface of the cylindrical heat shield plate 33.

  According to such a configuration of the tractor 1, the heat dissipation of the second exhaust gas processing unit 32 covered by the heat shielding plate 33 can be made favorable. Further, even if the heat shield plate 33 is provided with the vent holes 33a, it is possible to suppress the mud and the like flying from the front wheel 4 (see FIG. 1) side from entering through the vent holes 33a.

  Next, the fuel tank 16 and the urea aqueous solution tank 17 disposed in the airframe 2 will be described with reference to FIGS. 7 and 8. FIG. 7 is a perspective view showing the fuel tank 16 and the urea aqueous solution tank 17. FIG. 8 is a perspective view showing the fuel sub tank 60. As shown in FIG. As shown in FIG. 7, a urea aqueous solution tank 17 is provided on the left and right sides of the machine body 2 on the side opposite to the side provided with the support members 40. The urea water tank 17 is fixed to a loader bracket 36 provided between itself and the engine 7. Thereby, the urea aqueous solution tank 17 can be disposed in a simple structure, and the cost for manufacturing can be reduced. Further, on the left side of the fuselage 2, a fuel tank 16 is provided side by side with the urea aqueous solution tank 17. The supply port 17a of the urea water tank 17 and the supply port 16a of the fuel tank 16 are provided in parallel in the front-rear direction. The fuel tank 16 is provided to extend leftward and rightward below the airframe 2 (cabin 15). Further, the urea aqueous solution tank 17 is disposed on the front side of the fuel tank 16 outside the left or right (left side) of the cabin 15. This makes it possible to easily configure a tractor of the type equipped with the urea SCR system.

  As shown in FIG. 8, fuel is supplied to the engine 7 (see FIG. 3) in a system separate from the fuel tank 16 outside the left or right (in the present embodiment, the right side) of the airframe 2 (cabin 15) A fuel subtank 60 is provided. The fuel sub tank 60 is provided by removing one of the raising and lowering steps 21 (see FIG. 3) provided on the left and right outsides of the cabin 15. In this case, the operator gets on and off using the opposite lifting step 21 on the left and right of the cabin 15. The fuel sub tank 60 may be connected to the fuel tank 16 so as to supply the fuel from the fuel tank 16 to the engine 7. In this case, the fuel sub-tank 60 is preferably disposed in the vicinity of the fuel tank 16 below the cabin 15.

  According to such a configuration of the tractor 1, by providing the fuel subtank 60, the total amount of fuel can be increased, and the workable time can be extended. Also, the fuel can be increased with a simple configuration.

  In the case where the heights of the two fuel tanks (the fuel tank 16 and the fuel sub tank 60) are different, fuel leakage may occur, and it is not easy to secure the quality for the fuel leakage. For this reason, it is preferable that the fuel sub tank 60 be disposed to have the same height as the fuel tank 16. This makes it easy to ensure quality against fuel leaks. Further, since the heights of the respective tanks 16 and 60 are equal, management of the remaining amount of fuel is facilitated.

  Preferably, the fuel sub tank 60 is connected to the fuel tank 16 by two or more hoses. Thereby, the fluidity between the fuel sub tank 60 and the fuel tank 16 can be secured. Further, a check valve may be provided in a hose connecting the fuel sub tank 60 and the fuel tank 16. Thereby, it is possible to prevent the backflow of the fuel from the fuel tank 16 between the fuel sub tank 60 and the fuel tank 16.

  In the present embodiment, the adapter 38 described above is provided in front of the cabin 15 as a hydraulic pressure outlet used for the front loader. Further, in the present embodiment, the support bracket 55 of the fuel tank 16 (see FIG. 2) provided below the cabin 15 is also used as the cover of the hydraulic hose 50. According to these configurations, the hydraulic hose 50 can be easily routed to the front loader.

  Next, referring to FIG. 9, the urea water pump 65 for supplying urea water from the urea water tank 17 to the second exhaust gas processing unit 32 will be described. FIG. 9 is a perspective view showing the urea water pump 65. As shown in FIG. As shown in FIG. 9, the urea water pump (supply pump) 65 is provided on the lower side of the cabin 15 and on the inward side of the raising and lowering step 21 and is provided close to the second exhaust gas processing unit 32 There is. This enables effective use of space. And since it does not enlarge the body 2, the cost concerning manufacture can be made into low cost.

  Further, a plate-like pump cover (supply cover) 66 is attached to the urea water pump 65. The pump cover 66 is made of metal, for example, and is bent in an L shape so as to cover at least the outside exposed front and upper surfaces of the urea water pump 65. As a result, it is possible to prevent mud and the like from adhering to the urea water pump 65, and by making it metal, the cooling effect of the urea water pump 65 can be enhanced. In addition, by the urea water pump 65 being hidden by the pump cover 66, the aesthetic appearance of the vehicle can be enhanced. The pump cover 66 is formed to cover the hydraulic hose 50 and the joystick valve 51 as well as the urea pump 65. Hereinafter, components related to various supplies such as the urea water pump 65, the hydraulic hose 50, and the joystick valve 51 may be collectively referred to as a "supply module".

  Further, the pump cover 66 of the urea water pump 65 is provided with a plurality of slit-like vent holes 67. Thereby, the heat of the urea water pump 65 can be dissipated to the outside. Thereby, the cooling effect of the urea water pump 65 can be enhanced. In addition, the aesthetic appearance of the vehicle can be enhanced because the design looks good.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the invention are not limited to the specific details and representative embodiments represented and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

1 Work vehicle (tractor)
Reference Signs List 2 airframe 3 PTO output shaft 4 front wheel 5 rear wheel 6 bonnet 7 engine 8 transmission case 9 dash panel 10 pilot seat 11 fender 12 airframe 12a body frame 12a (supports cabin) airframe frame 13 steering handle 14 steering wheel post 15 cabin 16 fuel tank 16a Supply port 17 Urea water tank 17a Supply port 20 Clutch pedal 21 Lifting step 22 Muffler 30 Exhaust gas processing mechanism 31 First exhaust gas processing section (DOC)
32 Second exhaust gas processing unit (SCR)
33 Cover (heat shield board)
33a vent hole 34 pipe (tail pipe)
35 connection end 36 front loader bracket 37 collar member 38 adapter 40 support member (support bracket)
41 bottom portion 42 covering portion 43 opening 44 fixing member (rubber mount)
45 Fixing plate 50 Hydraulic hose 51 Joystick valve 55 Support bracket 60 Fuel sub tank 65 Urea water pump (supply pump)
66 Pump cover (supply cover)
67 vent holes

Claims (4)

Raising and lowering steps provided outside the front wheel, the rear wheel, the cabin surrounding the driver's seat and / or at least one of the left and right;
It has a cylindrical exhaust gas processing unit which is disposed upright on either the left or the right outside of the bonnet and which forms a part of an exhaust gas processing mechanism that purifies the exhaust gas of the engine.
The exhaust gas processing unit is mounted on a plate-like bottom portion provided in front of the cabin, and is disposed in front of the raising and lowering step and at a position behind the front wheel,
A tractor comprising: a cover which covers an outer peripheral surface of the exhaust gas processing unit and which has a plurality of ventilation holes on a surface opposite to a side opposite to a front wheel disposed in front of the exhaust gas processing unit. A urea water pump for supplying urea water to the exhaust gas processing unit which is disposed at the rear of the exhaust gas processing unit and is disposed in a space between the raising and lowering step and the cabin and purifies the exhaust gas of the engine;
The tractor cover according to claim 1, further comprising: a pump cover that covers a surface on the elevation step side of the urea water pump.   The tractor according to claim 2, wherein the pump cover has a plurality of vent holes.   The tractor according to any one of claims 1 to 3, wherein the bottom portion extends from the front of the cabin to the front of the lifting step and is flat.

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