JP6624276B2 - Tractor - Google Patents

Description

  The present invention relates to a tractor.

  BACKGROUND ART Conventionally, a work vehicle (for example, an agricultural tractor) includes an exhaust gas treatment mechanism that purifies an exhaust gas of an engine by sequentially passing the exhaust gas through two exhaust gas treatment units. For example, two exhaust gas treatment sections are arranged such that one (first exhaust gas treatment section) is arranged above the engine and the other (second exhaust gas treatment section) is arranged outside either the left or right of the hood inside the hood. Is done.

  Here, in the work vehicle as described above, as a support structure of the second exhaust gas treatment unit, for example, a cylindrical second exhaust gas treatment unit is arranged inside a support portion provided in a concave shape in a horizontal state. (See, for example, Patent Document 1).

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

  An object of the present invention is to provide a tractor capable of improving the support performance of an exhaust gas processing unit that constitutes a front loader and an exhaust gas processing mechanism.

In order to solve the above-mentioned problem and achieve the object, a tractor according to claim 1 is provided with an engine and a first exhaust gas treatment section inside a hood, and a second exhaust gas treatment section on one side of the hood. And
The first exhaust gas treatment unit and the second exhaust gas treatment unit are connected by a pipe,
A front loader bracket for mounting a front loader between the body frame on which the engine is mounted and the second exhaust gas treatment unit, and an adapter for extracting hydraulic pressure to the front loader are provided.

A tractor according to a second aspect is provided with the transmission case according to the first aspect,
A support member that supports the second exhaust gas processing unit is provided, and the support member is attached to a collar member that protrudes left and right one side from the transmission case,
The front loader bracket is connected to the support member and the body frame.

  According to a third aspect of the present invention, in the tractor according to the first or second aspect, the support member is a connecting portion between the bottom on which the second exhaust gas processing unit is mounted and the pipe and the second exhaust gas processing unit. Wherein the adapter is provided between the pipe and the second exhaust gas treatment unit and at a position above the support member and close to the coating unit.

  A tractor according to a fourth aspect is characterized in that, in the invention according to the third aspect, an opening is provided in the bottom at a position where a connection end of the pipe is arranged.

  According to the present invention, the cost for manufacturing can be reduced by providing the front loader for connecting the body frame and the support member.

  In addition, since the device used for the front loader is provided on the support member, it can be manufactured at a low cost in terms of structure. In addition, the space can be used effectively.

  Further, since the pipe is not exposed by the covering portion, the appearance of the vehicle can be enhanced. Further, since the heat of the pipe disposed on the support member is released to the outside of the support member from the opening, it is possible to prevent the heat from being trapped in the support member. Furthermore, it is possible to prevent dust and the like from being deposited on the support member.

FIG. 1 is a schematic left side view of the work vehicle according to the embodiment. FIG. 2 is a front view showing the internal structure of the hood. FIG. 3 is a plan view showing the internal structure of the hood. FIG. 4 is a perspective view showing an exhaust gas treatment mechanism. FIG. 5 is a perspective view illustrating 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 the fuel tank and the urea water tank. FIG. 8 is a perspective view showing the fuel sub-tank. FIG. 9 is a perspective view showing the fuel pump.

  Hereinafter, an embodiment of a work vehicle according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited by the embodiment. The components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

  FIG. 1 is a schematic left side view of a work vehicle 1 according to the embodiment. As illustrated in FIG. 1, a work vehicle 1 according to the embodiment is an agricultural tractor (hereinafter, a work vehicle is referred to as a “tractor”) that performs ground work while traveling on a field or the like. Hereinafter, the forward direction of the tractor 1 as a working vehicle is referred to as a front side (left side in FIG. 1), the direction opposite to the forward direction is referred to as a rear side (right side in FIG. 1), and is orthogonal to the front-rear direction of the tractor 1. The vertical direction perpendicular to the front-rear direction of the tractor 1 is referred to as a vertical direction.

  The tractor 1 is capable of transmitting power generated by the engine 7 and reduced by the main transmission and the auxiliary transmission to the front wheels 4 via the front wheel speed changeover mechanism. In the tractor 1, when the front wheel speed-increasing switching mechanism transmits power, four wheels including the front wheel 4 and the rear wheel 5 are driven by the power transmitted from the engine 7. Also, in the tractor 1, when the front wheel speed-increasing switching mechanism interrupts the transmission of power, the two wheels of the rear wheels 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. In addition, a PTO (Power take-off) output shaft 3 to which a working machine such as a rotary machine can be mounted is provided at the rear of the body 2 of the tractor 1.

  The fuselage 2 is attached to a transmission case 8 in which a main transmission, a subtransmission, a front wheel speed-increasing switching mechanism, a PTO transmission unit that transmits driving force to the PTO output shaft 3 and the like are accommodated, and is mounted on a front portion of the transmission case 8. It comprises a panel dash 9 and a body frame 12 which supports the cabin 15 and on which the engine 7 and the like are installed. The mission case 8, the panel dash 9, and the body frame 12 constituting the body 2 are made of metal. The body frame 12 is roughly divided into a portion that supports the cabin 15 and a portion below the hood 6 where the engine 7 and the like are installed.

  The engine 7 is mounted on the body frame 12 in front of the panel dash 9 and is covered by the hood 6. The transmission case 8 is provided from the panel dash 9 to the rear of the body 2. A cockpit 10 is provided above the rear of the transmission case 8. Mudguard fenders 11 are provided on the left and right sides of the cockpit 10, respectively. The hood 6 is attached to the body 2 so as to be freely rotatable, and is attached to open and close the internal space.

  The cockpit 10 is used by an operator to control the tractor 1 and is surrounded by a cabin 15 supported by a body frame 12. In front of the cockpit 10, a steering handle 13 used for steering the front wheels 4, a display panel for providing various information to the operator, and an operation panel for the operator to perform various operations are provided. The steering handle 13 is rotatably supported by the handle post 14. Below the handle post 14, that is, near the operator's feet 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, and An accelerator pedal for accelerating the vehicle body 2 is provided.

  On the right side of the cockpit 10, there is provided a work implement elevating lever for vertically moving a work machine such as a rotary mounted on the rear of the tractor 1, and on the left side of the cockpit 10 when the tractor 1 is running. , A main transmission lever for performing an operation relating to shifting of the main transmission and an auxiliary transmission lever for performing an operation relating to the auxiliary transmission. The main shift lever operates a main shift, which is a shift of the main transmission, and can switch between an automatic shift that automatically performs the main shift and a manual shift that is optionally performed by an operator. Note that the main transmission lever switches the reduction ratio of the main transmission to any one of eight stages in manual transmission. Further, the sub-transmission lever can operate the sub-transmission to switch the traveling speed among ultra-low speed, low speed, medium speed, high speed and neutral.

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

  Further, the aircraft 2 is provided with at least one of the left and right outsides of the cabin 15 (in the present embodiment, outside of the left and right sides of the cabin 15), a lifting / lowering step 21 used when an operator gets on and off the cabin 15. . Further, the airframe 2 is provided with a muffler 22 standing upright for discharging the exhaust gas of the purified engine 7 to the atmosphere at least at one of the left and right sides of the hood 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 FIG. 3, the cabin 15 is 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 treatment mechanism 30 is configured to include two exhaust gas treatment units, that is, a first exhaust gas treatment unit 31 (see FIG. 3) and a second exhaust gas treatment unit 32. The first exhaust gas processing unit 31 is disposed above the engine 7 inside the hood 6. The second exhaust gas processing unit 32 is disposed outside either the left or right of the bonnet 6.

  The exhaust gas treatment mechanism 30 has a function of a DOC (Diesel Oxidation Catalyst) for the first exhaust gas treatment unit 31 to efficiently oxidize nitrogen monoxide (NO) in the exhaust gas. Further, the exhaust gas treatment mechanism 30 has a function of SCR (Selective Catalytic Reduction) using urea water (NH3) in the second exhaust gas treatment unit 32. In such an exhaust gas treatment mechanism 30, in the DOC, nitrogen monoxide (NO) in the exhaust gas is converted into carbon dioxide (NO2), and in the SCR, urea water (NH3) is supplied to the nitrogen dioxide (NO2). By converting nitrogen (NO2) into water (H2O) and nitrogen gas (N2), nitrogen oxides (NOX) in the exhaust gas are removed. In general, both DOC and SCR are indispensable for removing a specified amount of nitrogen oxides (NOX).

  As shown in FIG. 3, a second exhaust gas processing unit 32 and a muffler 22 protruding above the second exhaust gas processing unit 32 are disposed outside the right side of the bonnet 6. A urea water tank 17 that stores urea water to be supplied to the second exhaust gas processing unit 32 is disposed outside the cabin 15 on the opposite side (left side) from the support member 40. As described above, the second exhaust gas processing unit 32 is disposed on one of the left and right sides of the bonnet 6 and the urea water tank 17 is disposed on the other, thereby improving the balance of the body 2. Can be. In addition, the space can be effectively used.

  Further, as shown in FIG. 3, the fuel tank 16 extends over the right and left sides of the body 2. For example, a hydraulic hose 50 for moving the hydraulic pressure toward the front loader is routed from the transmission case 8 to a lower part of the fuel tank 16 through a joystick valve 51 provided on a side surface of the fuel tank 16. Thereby, wiring of the hydraulic hose 50 becomes easy. Further, on the lower surface of the fuel tank 16, there is provided a hose insertion portion whose outer shape is dented like a notch. By passing the hydraulic hose 50 through the hose insertion portion, it is possible to prevent the hydraulic hose 50 from projecting from the lower surface of the fuel tank 16. Thereby, wiring of the hydraulic hose 50 becomes easy.

  Next, the configuration of the exhaust gas treatment mechanism 30 will be described with reference to FIGS. FIG. 4 is a perspective view showing the exhaust gas treatment mechanism 30. FIG. 5 is a perspective view showing the second exhaust gas processing unit 32 and the support member 40. Note that, as described above, the exhaust gas treatment mechanism 30 is configured to include the first exhaust gas treatment unit 31 (DOC) and the second exhaust gas treatment unit 32 (SCR). As shown in FIG. 4, the first exhaust gas processing section 31 is mounted on the engine 7. The 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). The second exhaust gas processing section 32 is formed in a cylindrical shape, and is supported by a support member 40 described later on either the left or right outside of the bonnet 6 (in this embodiment, the right outside of the bonnet 6). Mounted upright. The exhaust gas that has been subjected to the primary treatment in the first exhaust gas treatment unit 31 flows into the second exhaust gas treatment unit 32. As described above, the second exhaust gas processing unit 32 supplies urea water (NH3) to nitrogen dioxide (NO2) to convert nitrogen dioxide (NO2) into water (H2O) and nitrogen gas (N2). Thereby, nitrogen oxides (NOX) in the exhaust gas are removed. The exhaust gas secondarily treated by the second exhaust gas treating section 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 shield plate 33. Since the outer periphery is covered by the heat shield plate 33 in this manner, the heat insulation effect of the second exhaust gas processing unit 32 can be enhanced. In addition, the first exhaust gas processing unit 31 and the second exhaust gas processing unit 32 are connected by a pipe (tail pipe) 34. Further, a front loader bracket 36 (hereinafter simply referred to as a “loader bracket”) to which a front loader is attached is provided between the body frame 12 on which the engine 7 is mounted and the supporting member 40 on which the second exhaust gas processing unit 32 is mounted. Is provided). The body frame 12 and the support member 40 are connected using a loader bracket 36. In this way, by providing the existing parts for connecting the body frame 12 and the support member 40, it is possible to reduce the manufacturing cost.

  On the support member 40, an adapter 38 for extracting hydraulic pressure to the front loader is provided between the second exhaust gas processing unit 32 and the engine 7. As described above, by providing a device (for example, a hydraulic take-out device) for another device (for example, a front loader) on the support member 40, it is possible to manufacture the device at a low cost structurally. In addition, the space can be used effectively.

  When the body frame 12 and the support member 40 are connected by the loader bracket 36, the 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 so as to protrude from the transmission case 8 to the left or right side, and the loader bracket 36 is attached to the body frame 12 and the support member in the attached state. 40 and fixed to both sides. 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, and thereby, the manufacturing cost 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. FIG. 6 shows a state in which the second exhaust gas processing unit 32 and the pipe 34 have been removed from the support member 40. As shown in FIG. 6, the support member (support bracket) 40 has a plate-shaped bottom portion 41 on which the second exhaust gas treatment section 32 is placed. The bottom part 41 is formed in a long plate shape on the left and right. Further, the bottom portion 41 projects forward of a portion supporting the cabin 15 of the body frame 12 (hereinafter, this portion is referred to as “body frame 12a”), and the second exhaust gas processing unit 32 It is arranged so as to be placed one-sided to the front (to the right in this embodiment).

  In other words, the second exhaust gas processing unit 32 is placed on the bottom 41 so as to be offset toward the outer half (the right half in the present embodiment) as viewed from the bonnet 6. In addition, the bottom portion 41 has a connection end portion 35 with the second exhaust gas treatment portion 32 of the pipe 34 (FIG. 2), which is biased toward an inner half portion (left half portion in the present embodiment) as viewed from the bonnet 6. 5) is arranged. The support member 40 has a covering portion 42 that covers 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 on the bottom 41. Thereby, since the pipe 34 is not exposed, the beauty of the vehicle can be enhanced. An opening 43 is provided in the bottom 41 at a position where the connection end 35 of the pipe 34 is arranged. The support member 40 has a bottom portion 41 fixed to the body frame 12a, and a covering portion 42 suspended and fixed from below the cabin 15 by an L-shaped fixing member (rubber mount) 44. Furthermore, it is preferable that the support member 40 is integrally formed by casting. Thereby, the appearance can be enhanced. Furthermore, in addition to the fact that the support member 40 is cast and integral, the flat bottom 41 can protect the second exhaust gas treatment section 32 and the pipe 34 and damage crops in the field. Can be prevented.

  According to such a configuration of the tractor 1, since the support member 40 supports the second exhaust gas processing unit 32 from below, it is possible to support the second exhaust gas processing unit 32 with appropriate support strength. Thereby, the support performance of the second exhaust gas treatment section 32 can be improved. Further, since the structure is simple, the support member 40 can be obtained at low cost. Furthermore, the left and right (right) lower portions of the cabin 15 can be easily seen from the cockpit 10 by arranging the second exhaust gas processing unit 32 away from the fuselage 2 either left or right (right side). Visibility can be improved.

  Further, since the heat of the pipe 34 disposed on the support member 40 is released from the opening 43 to the outside of the support member 40, it is possible to prevent the heat from being trapped in the support member 40. Further, it is possible to prevent dust and the like from being deposited on the support member 40.

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

  Further, as described above, the second exhaust gas processing section 32 is provided with a heat shield (hereinafter, the cover is referred to as a “heat shield”) 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 provided on a surface (a rear surface of the heat shielding plate 33) opposite to a side of the heat shielding plate 33 facing the front wheel 4 (see FIG. 1) disposed in front of the second exhaust gas processing unit 32. ). That is, it is preferable that the ventilation hole 33a is not provided on the front surface of the heat shield plate 33. Note that the vent hole 33a only needs to avoid a range facing the heat shield plate 33 when viewed from the front wheel 4. Therefore, for example, when the heat shield plate 33 is disposed to be shifted 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 greater than the case where the heat shield plate 33 is on a straight line of the front wheel 4. It shifts to either left or right. Further, it is preferable that the ventilation hole 33a is provided in a range of about two thirds on the rear side of the entire peripheral surface of the cylindrical heat shield plate 33.

  According to such a configuration of the tractor 1, it is possible to improve the heat radiation of the second exhaust gas processing unit 32 covered with the heat shield 33. Further, even if the heat shield plate 33 is provided with the ventilation hole 33a, it is possible to suppress mud and the like flying from the front wheel 4 (see FIG. 1) from entering through the ventilation hole 33a.

  Next, the fuel tank 16 and the urea water tank 17 arranged in the body 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 water tank 17. FIG. 8 is a perspective view showing the fuel sub-tank 60. As shown in FIG. 7, a urea water tank 17 is provided on the left and right sides of the body 2 on the opposite side to the side provided with the support member 40. The urea water tank 17 is fixed to a loader bracket 36 provided between the urea water tank 17 and the engine 7. Thereby, the urea water tank 17 can be arranged with a simple structure, and the cost for manufacturing can be reduced. On the left side of the body 2, a fuel tank 16 is provided in front of and behind the urea water 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 front and rear in parallel. The fuel tank 16 is provided to extend left and right below the body 2 (the cabin 15). Further, the urea water tank 17 is disposed on the front side of the fuel tank 16 outside either the left or right (left side) of the cabin 15. Thereby, a tractor of the type equipped with the urea SCR system can be easily configured.

  As shown in FIG. 8, fuel is supplied to the engine 7 (see FIG. 3) outside of either the left or right (in the present embodiment, the right side) of the body 2 (the cabin 15) by a different system from the fuel tank 16. A fuel sub-tank 60 is provided. The fuel sub-tank 60 is provided by removing one of the lifting / lowering steps 21 (see FIG. 3) provided on the left and right sides of the cabin 15. In this case, the operator gets on and off using the ascending and descending steps 21 on the left and right sides of the cabin 15. The fuel sub-tank 60 may be connected to the fuel tank 16 and supply fuel from the fuel tank 16 to the engine 7. In this case, the fuel sub-tank 60 is preferably arranged below the cabin 15 and close to the fuel tank 16.

  According to such a configuration of the tractor 1, by providing the fuel sub-tank 60, the total amount of fuel can be increased, and the operable time can be extended. Further, fuel can be increased with a simple configuration.

  If 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 ensure the quality against the fuel leakage. For this reason, it is preferable that the fuel sub-tank 60 is disposed so as to have the same height as the fuel tank 16. This facilitates quality assurance against fuel leakage. In addition, since the heights of the tanks 16 and 60 are equal, the remaining amount of fuel can be easily managed.

  Preferably, the fuel sub-tank 60 is connected to the fuel tank 16 by two or more hoses. Thereby, fluidity between the fuel sub-tank 60 and the fuel tank 16 can be ensured. 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 fuel from flowing backward 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. 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 a cover of the hydraulic hose 50. According to these configurations, the hydraulic hose 50 can be easily routed to the front loader.

  Next, the urea water pump 65 that supplies urea water from the urea water tank 17 to the second exhaust gas processing unit 32 will be described with reference to FIG. FIG. 9 is a perspective view showing the urea water pump 65. As shown in FIG. 9, the urea water pump (supply pump) 65 is provided below the cabin 15, on the inner side of the elevating step 21, and is provided near the second exhaust gas processing unit 32. I have. Thereby, the space can be effectively used. Further, since the size of the body 2 is not increased, manufacturing costs can be reduced.

  A plate-shaped pump cover (supply cover) 66 is attached to the urea water pump 65. The pump cover 66 is made of, for example, metal, and is bent in an L shape so as to cover at least the front and upper surfaces exposed to the outside of the urea water pump 65. Accordingly, it is possible to prevent mud and the like from adhering to the urea water pump 65, and it is possible to enhance the cooling effect of the urea water pump 65 by being made of metal. Further, since the urea water pump 65 is hidden by the pump cover 66, the appearance of the vehicle can be enhanced. The pump cover 66 is formed to cover the hydraulic hose 50, the joystick valve 51, and the like, in addition to 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”.

  The pump cover 66 of the urea water pump 65 is provided with a plurality of slit-shaped ventilation holes 67. Thereby, the heat of the urea water pump 65 can be released to the outside. Thereby, the cooling effect of the urea water pump 65 can be enhanced. In addition, since the appearance is good in design, the aesthetic appearance of the vehicle can be enhanced.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown 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 equivalents thereof.

1 work vehicle (tractor)
2 body 3 PTO output shaft 4 front wheel 5 rear wheel 6 bonnet 7 engine 8 transmission case 9 dash panel 10 cockpit 11 fender 12 body frame 12a (supports cabin) body frame 13 steering handle 14 handle post 15 cabin 16 fuel tank 16a Supply port 17 Urea tank 17a Supply port 20 Clutch pedal 21 Elevating step 22 Muffler 30 Exhaust gas treatment mechanism 31 First exhaust gas treatment section (DOC)
32 Second exhaust gas treatment unit (SCR)
33 cover (heat shield)
33a ventilation hole 34 pipe (tail pipe)
35 connection end 36 front loader bracket 37 collar member 38 adapter 40 support member (support bracket)
41 bottom part 42 covering part 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 hole

Claims (4)

Provide an engine and a first exhaust gas treatment unit inside the bonnet, provide a second exhaust gas treatment unit on one side of the bonnet left and right,
The first exhaust gas treatment unit and the second exhaust gas treatment unit are connected by a pipe,
A tractor, comprising: a front loader bracket for mounting a front loader between a body frame on which an engine is mounted and a second exhaust gas processing unit; and an adapter for extracting hydraulic pressure to the front loader. Set up a mission case,
A support member for supporting the second exhaust gas processing unit is provided,
The support member is attached to a collar member that projects left and right one side from the transmission case,
The tractor according to claim 1, wherein the front loader bracket is connected to the support member and the body frame.   The support member includes a bottom portion on which a second exhaust gas processing unit is mounted, and a coating unit that covers a connection portion between the pipe and the second exhaust gas processing unit, and the adapter includes a pipe and the second exhaust gas processing unit. The tractor according to claim 1, wherein the tractor is provided between the support members and at a position above the support member to approach the covering portion.   The tractor according to claim 3, wherein an opening is provided in the bottom portion at a position where a connection end of the pipe is arranged.

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