JP2017030520A - Tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tractor that is improved in exhaust heat efficiency from an inside of an engine room to an outside of an engine hood so as not to cause a failure in a device and a component inside the engine room due to high-temperature when DPF is disposed in the vicinity of an engine.SOLUTION: The tractor includes: an engine body 1; the DPF 19 mounted to an upper part of the engine body 1; and the engine hood 7 in which an exhaust hole 30 is formed so that at least part thereof overlaps on the DPF 19 in side view. The DPF 19 has a columnar shape of which axial length is longer than the diameter thereof. The DPF 19 is disposed so that the axial direction thereof is parallel to a longitudinal direction of the tractor.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a tractor. In detail, it is related with arrangement | positioning of DPF (diesel particulate collection filter) in the bonnet cover of a tractor.

  Conventionally, a tractor in which a DPF is disposed in a bonnet is known. Patent document 1 discloses this kind of tractor. The tractor disclosed in Patent Document 1 has a configuration in which a DPF is compactly disposed in the vicinity of an engine body, and the heat generated by the engine is efficiently used for DPF regeneration processing.

JP 2015-27836 A

  The DPF may generate a large amount of heat, for example, when regenerating, and there is a risk of causing thermal damage to the devices disposed around the DPF. In particular, when the DPF is housed in the bonnet, heat is not easily discharged and the ambient temperature tends to increase. However, the configuration of Patent Document 1 has room for improvement in that the influence of heat on devices and components in the engine room is not taken into consideration.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent problems caused by high temperatures in the devices and parts in the engine room when the DPF is disposed in the vicinity of the engine body. The purpose is to improve the efficiency of exhaust heat from the outside of the hood.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to an aspect of the present invention, a tractor having the following configuration is provided. That is, this tractor is equipped with an engine main body and a DPF and a bonnet. The DPF is attached to the upper part of the engine body. The bonnet is formed with an exhaust hole so as to at least partially overlap the DPF in a side view. The DPF is disposed at a position that is biased to one side from the center in the left-right direction in the bonnet. The exhaust hole is formed on at least the side wall of the bonnet on the same side as the side on which the DPF is disposed.

  Thereby, the heat released from the DPF is efficiently discharged out of the bonnet from the exhaust hole. As a result, problems due to high temperatures are less likely to occur in devices and members in the engine room.

  In the tractor, it is preferable that the DPF has a cylindrical shape whose axial length is longer than the diameter, and the axial direction of the DPF is arranged in parallel with the front-rear direction of the tractor.

  Thereby, compared with the case where the cylindrical axial direction of the DPF is arranged in the left-right direction, the projected area of the DPF on the side wall of the bonnet is increased. As a result, it is easy to increase the area where the DPF and the exhaust hole overlap in a side view, and the exhaust heat efficiency of the engine room can be further increased.

  The tractor preferably has the following configuration. That is, a fan shroud is disposed in front of the engine body and in front of the DPF. An air cleaner is disposed in front of the fan shroud.

  As a result, it is possible to realize an arrangement that allows easy access to the air cleaner with the bonnet open, which facilitates maintenance of the air cleaner. In addition to the fact that the heat of the DPF is easily discharged from the exhaust hole as described above, a fan shroud is arranged between the DPF and the air cleaner, so that the air cleaner is not easily affected by the heat of the DPF. can do.

  The tractor preferably has the following configuration. That is, the air cleaner is fixed to a support bracket disposed in front of the fan shroud. A sub-tank that stores cooling water for the radiator is fixed to the support bracket.

  This eliminates the need for a special support bracket for fixing the sub-tank, thereby reducing the number of parts and reducing the cost.

  The tractor preferably has the following configuration. That is, in plan view, the support bracket is disposed so as to be inclined to the left and right as it approaches the front. In a plan view, the air cleaner is disposed to be inclined to the left and right sides along the direction of the support bracket.

  Thereby, even when the inner space of the front part of the bonnet is formed so that the left and right widths become narrower as it approaches the front, the air cleaner is appropriately arranged so as not to interfere with the inner wall of the bonnet. can do.

The right view which shows the whole structure of the tractor which concerns on one Embodiment of this invention. The right view which showed the inside of a bonnet. The perspective view which showed the mode inside the bonnet. The left view which showed the mode inside the bonnet. The perspective view which showed the mode inside the bonnet. The top view which showed the mode inside the bonnet. The perspective view which showed the positional relationship of a bonnet and the internal structure of a bonnet. The perspective view which showed the outline of the flow of the air inside a bonnet. The right view which showed the positional relationship of a bonnet and the internal structure of a bonnet. The top view which showed the positional relationship with a bonnet and the internal structure of a bonnet.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a right side view showing an overall configuration of a tractor 6 according to an embodiment of the present invention. In the following description, “left”, “right”, and the like mean left and right in the direction in which the tractor 6 moves forward.

  A tractor 6 as a farm work vehicle (work machine) shown in FIG. 1 is configured so that various devices such as a plow, a harrow, and a loader can be mounted as necessary to perform various types of work. . A front wheel 8 is disposed at the front of the tractor 6 and a rear wheel 9 is disposed at the rear.

  A bonnet 7 is disposed at the front of the tractor 6, and the bonnet 7 is configured to be openable and closable so that the inside can be exposed. The bonnet 7 is formed in a streamline shape, and its front part is formed so as to become narrower in both the vertical direction and the horizontal direction as it approaches the front. With this shape, a reduction in air resistance during travel and an improvement in design are realized.

  The engine body 1 is accommodated in the bonnet 7. The engine main body 1 is supported on an engine frame 11 included in the tractor 6 directly or via a vibration isolation member or the like.

  The engine body 1 is configured as a common rail type diesel engine having a plurality of cylinders. More specifically, the engine body 1 includes an unillustrated common rail that stores fuel at a high pressure. The fuel supplied from the common rail is injected into the combustion chamber by an injector (not shown) arranged for each cylinder.

  A cabin 10 for an operator to board is disposed behind the hood 7, and an operation unit 71 and a seat unit 72 for performing various operations are provided inside the cabin 10. An operator of the tractor 6 can perform a traveling operation or the like of the tractor 6 via the operation unit 71.

  The skeleton of the fuselage included in the tractor 6 includes an engine frame 11 and a mission case 62 fixed to the rear portion of the engine frame 11. A front axle case 63 is attached to the lower side of the engine frame 11. A front wheel 8 is attached to the front axle case 63 via a front axle 8a. The rear wheel 9 is attached to the mission case 62 via the rear axle 9a. Upper portions of the left and right rear wheels 9 are covered with left and right rear fenders 65.

  The transmission case 62 decelerates the power from the engine body 1 and transmits it to the front axle case 63 and the rear axle 9a. When the operator operates a shift lever of a speed change device (not shown), the speed ratio in the transmission case 62 can be changed and the traveling speed of the tractor 6 can be adjusted.

  Further, the driving force of the engine body 1 is transmitted to a PTO shaft (not shown) protruding from the rear end of the mission case 62. The tractor 6 is configured so that the above-described device can be attached to the rear end thereof. The PTO shaft can drive the working device via a universal joint (not shown) or the like.

  The tractor 6 configured as described above can perform various operations such as tilling, sowing, and harvesting while traveling in the rice field.

  Next, with reference to FIG. 2 to FIG. 7, the arrangement of the components in the bonnet 7 will be described. FIG. 2 is a right side view showing the inside of the hood 7 of the tractor 6 of the present embodiment. FIG. 3 is a perspective view of the inside of the bonnet 7. FIG. 4 is a left side view inside the bonnet 7. FIG. 5 is a perspective view of the inside of the bonnet 7. FIG. 6 is a plan view of the inside of the bonnet 7. FIG. 7 is a perspective view showing the positional relationship between the bonnet 7 and the internal structure of the bonnet 7.

  The engine body 1 is disposed on the upper side of the engine frame 11. A DPF 19 is disposed on the upper left side of the engine body 1. An oil supply tank 3 is disposed on the upper portion of the engine body 1 so as to be adjacent to the DPF 19. A fan shroud (partition plate) 12 is provided immediately in front of the engine body 1. The fan shroud 12 is disposed so as to partition the engine main body 1 disposed at the rear portion in the hood 7 and the devices and components disposed at the front portion in the bonnet 7. A radiator 13, a condenser 18, an engine controller 2, a battery 14, an air cleaner 15, and a sub tank 20 are arranged further forward of the fan shroud 12 (corresponding to the front part of the internal space of the bonnet 7). Yes. The devices and members arranged from the central part to the front part in the bonnet 7 are arranged on the upper surface side of the plate-like mounting plate 16 fixed to the engine frame 11.

  An unillustrated cooling fan is disposed on the fan shroud 12, and this cooling fan is driven by receiving power from the engine body 1. Due to the rotation of the cooling fan, a relatively low temperature outside air is taken in from a front grill (not shown) in front of the bonnet 7, and the outside air passes through the radiator 13 and the cooling fan and is sent to the engine body 1 side. 1 is cooled.

  The fan shroud 12 is configured to partition the internal space of the bonnet 7 in the front-rear direction. Therefore, heat from the engine main body 1 and the DPF 19 can be shielded from devices and members (such as the radiator 13 and the condenser 18) disposed in front of the fan shroud 12.

  The fan shroud 12 is formed of a synthetic resin and molded into a shape having a notch portion 23, and the intake pipe 17 and the engine harness 26 pass through the notch portion 23. An easily detachable closing sheet 25 is attached to the upper end portion of the front surface of the fan shroud 12 so as to close the open portion of the cutout portion 23 of the fan shroud 12. As a result, even when vibration or impact is applied to the tractor 6, the intake pipe 17 or the like passing through the notch portion 23 is kept within a certain range so as not to come out of the notch portion 23. With this configuration, the intake pipe 17 is maintained while maintaining a high wind guiding effect of the cooling fan that efficiently takes in outside air for cooling the engine body 1 and a shielding effect that makes it difficult for heat on the engine body 1 side to be transmitted to the front device. The maintenance of such members is facilitated.

  The engine harness 26 electrically connects each part of the engine body 1 and the engine controller 2. The engine harness 26 is supported by ribs formed along the longitudinal direction of the intake pipe 17. As a result, the number of parts can be reduced as compared with a configuration in which a separate stay or the like for supporting the engine harness 26 is provided, and the engine harness 26 can be disposed along the intake pipe 17 in a small space. An engine harness 26 can be disposed.

  The DPF 19 is attached to an exhaust pipe, and is configured to collect and remove particulate matter (PM) discharged from the engine body 1 with a filter. However, since the PM collected by the DPF 19 increases as the engine is operated, if the PM collected in the DPF 19 accumulates to a certain extent, the exhaust temperature of the engine body 1 is controlled to rise, and the PM is lowered in the DPF 19 at a high temperature. The filter is prevented from being clogged by burning (DPF regeneration).

  For example, the DPF 19 may generate a large amount of heat when performing the above-described DPF regeneration, and there is a risk of causing thermal damage to the devices disposed around the DPF 19. Therefore, as shown in FIG. 7, the exhaust hole 30 is formed so as to be positioned in the vicinity of the DPF 19 with the hood 7 closed. As a result, the efficiency of exhaust heat from the engine room to the outside of the bonnet can be improved, so that problems due to high temperatures do not occur in the devices and components in the engine room.

  The fan shroud 12 supports a differential pressure sensor 81 that detects a pressure difference between the upstream side and the downstream side of the filter of the DPF 19. The differential pressure sensor 81 is connected to the upstream and downstream spaces of the filter in the DPF 19 via appropriate piping. Accordingly, it is not necessary to separately provide a dedicated member for supporting the differential pressure sensor 81, so that the configuration of the tractor 6 can be simplified and the cost can be reduced.

  The radiator 13 is configured as a heat exchanger, and an unillustrated circulation path for circulating cooling water is formed between the radiator 13 and an unillustrated water jacket formed in the engine body 1. Yes. The cooling water in the water jacket that has become hot due to the heat generated by the engine body 1 is sent to the radiator 13. The cooling water is cooled by the outside air taken in from the front grill when passing through the radiator 13, and then returns to the water jacket again to cool the engine body 1.

  The condenser 18 is configured as a heat exchanger and is used in an air conditioner that performs air conditioning in the cabin 10. The capacitor 18 is supported by a capacitor frame 31 and attached to the front of the radiator 13.

  The engine controller 2 is configured as a small computer, and the engine is configured by the engine body 1 and the engine controller 2. Based on information from various sensors attached to the engine body 1 and the like, the engine controller 2 sends control commands for controlling the fuel injection amount, fuel injection timing, and the like to various actuators (the injector provided in the engine body 1). To control the engine.

  The engine controller 2 is supported via an anti-vibration support structure 35 including a plurality of anti-vibration rubbers 33. Specifically, a support plate 32 is attached to an upper portion of a gate-type capacitor frame 31 that supports the capacitor 18, and the anti-vibration support structure 35 is disposed on the support plate 32. Some of the plurality of anti-vibration rubbers 33 are arranged perpendicular to the thickness direction of the engine controller 2, and the rest are arranged parallel to the thickness direction of the engine controller 2. The engine controller 2 is fixed to the support plate 32 via these vibration isolating rubbers 33.

  Since the engine controller 2 is disposed at a position higher than the capacitor 18 in the bonnet 7, the engine controller 2 is easily accessible when the bonnet 7 is opened. With this configuration, the vibration and impact transmitted to the engine controller 2 are prevented, and the maintainability of the engine controller 2 is improved.

  The battery 14 supplies electric power to various electric components included in the tractor 6 (for example, a cell motor included in the engine body 1, a headlight of the tractor 6, an engine controller 2, etc.).

  The air cleaner 15 has a configuration in which an air cleaner element for removing foreign substances in the air is housed inside. The air cleaner 15 is connected to the engine body 1 by an intake pipe 17 and constitutes a part of the intake structure of the engine body 1. The intake pipe 17 extending from the engine main body 1 passes through a notch portion 23 formed in the fan shroud 12 in the front-rear direction, passes over the radiator 13, and then turns downward to connect to the air cleaner 15. Be placed.

  The sub tank 20 is configured as a vertically elongated container connected to the radiator 13 by piping, and is configured to store the overflow amount of the cooling water in the radiator 13. When the cooling water in the radiator 13 increases due to thermal expansion, the cooling water in the radiator 13 flows into the sub tank 20, while when the cooling water in the radiator 13 decreases, the cooling water in the sub tank 20 is returned to the radiator 13. . Thereby, the cooling water in the radiator 13 is maintained at a predetermined amount.

  The air cleaner 15 and the sub tank 20 are fixed to the left and right sides of a support bracket 21 that is flat and has a thickness direction oriented horizontally. This eliminates the need for special fixing members for fixing the air cleaner 15 and the sub-tank 20, thereby reducing the number of parts and reducing the cost.

  The fuel tank 3 is disposed on the upper part of the engine body 1. The oil supply tank 3 has an oil supply port (cap) 3a in the upper part, from which oil is supplied. The oil supply port 3 a of the oil supply tank 3 is arranged so as to protrude from a hole provided in the upper part of the bonnet 7, and the operator can perform an oil supply operation without depending on the open / closed state of the bonnet 7. .

  Here, the main air flow formed in the bonnet 7 will be described with reference to FIG. FIG. 8 is a perspective view showing an outline of the air flow inside the bonnet 7.

  A part of the relatively low temperature air entering from a front grill (not shown) in front of the bonnet 7 is taken into the air cleaner 15 and flows to the engine body 1 via the intake pipe 17. A part of the air that is not taken into the air cleaner 15 flows along the upper and lower surfaces of the engine controller 2 arranged so as to project forward and downward from the space above the condenser 18, thereby efficiently cooling the engine controller 2. To do. The engine controller 2 is arranged in a rear-upward manner, and the inner wall of the portion where the bonnet 7 covers the upper side of the engine controller 2 is also arranged in a rear-upward manner, so that the air flow around the engine controller 2 is smooth. It is.

  Of the air that has entered the front grille, most of the air that has not been sucked into the air cleaner 15 (including the air that has flown around the engine controller 2 as described above) is largely due to the wind guide effect of the fan shroud 12 described above. The fan shroud 12 passes through the condenser 18 and the radiator 13 arranged so as to cover the front surface of the air intake port formed in the central portion. Thereby, the refrigerant | coolant of an air conditioner and engine cooling water can be cooled by heat exchange.

  The air after passing through the radiator 13 is blown rearward by a cooling fan (not shown) provided in the fan shroud 12. Thereafter, the air hits the front surface of the engine body 1 and spreads radially, and flows backward in the space above and to the left and right of the engine body 1. Thereby, the engine main body 1 can be cooled efficiently. In addition, the air flowing along the left side surface of the engine body 1 flows smoothly along the longitudinal direction of the DPF 19, and as a result, the DPF 19, which often has a high temperature, can be efficiently cooled. The air flowing behind the fan shroud 12 takes heat from the engine body 1 and the DPF 19 to become relatively hot air, and most of the air is formed in the bonnet 7 at a position substantially opposite to the DPF 19 in the left-right direction. The exhaust hole 30 is discharged out of the bonnet 7. As a result, air that has become hot because it has passed through the vicinity of the DPF 19 is easily discharged from the exhaust hole 30 immediately, so that it is possible to prevent the hot air from staying in the bonnet 7 for a long time and reducing the cooling effect. Can do.

  During the operation of the tractor 6, foreign matter such as weeds, sawdust, and dust may get on the radiator 13 by riding on the air flow taken into the radiator 13. If the fins of the radiator 13 are clogged due to the mixing of these foreign substances, the cooling effect of the radiator 13 is reduced.

  In order to prevent the occurrence of this clogging, in the tractor 6 of the present embodiment, a dust-proof screen (dust-proof member) 50 is provided on the air intake side surface (front surface) of the radiator 13, and foreign matter is captured by the dust-proof screen 50. Thus, the inflow to the radiator 13 is prevented.

  If foreign matter accumulates on the dust-proof screen 50 and becomes clogged, the air flow deteriorates. Therefore, the dust-proof screen 50 needs to be cleaned at an appropriate timing. Therefore, in the present embodiment, the dust screen 50 is detachably disposed from the radiator 13 in order to easily clean the dust screen 50.

  Next, the positional relationship between the exhaust hole 30 of the bonnet 7 and the DPF 19 will be described with reference to FIGS. FIG. 9 is a right side view showing the positional relationship between the hood and the internal structure of the hood. FIG. 10 is a plan view showing the positional relationship between the hood and the internal structure of the hood.

  The engine body 1 is disposed above the rear portion of the engine frame 11, and the bonnet 7 is disposed so as to cover the engine body 1. The engine body 1 is disposed in the rear part of the internal space of the bonnet 7. A DPF 19 is attached to the upper left side of the engine body 1. The DPF 19 is disposed at a position offset to the left side of the left and right center of the internal space in a plan view with the hood 7 closed.

  On the other hand, an exhaust hole 30 is formed in the left side wall of the rear part of the bonnet 7 (in other words, the side wall on the same side as the side where the DPF 19 is offset). More specifically, the bonnet 7 includes left and right side walls, an upper wall that connects the upper ends of the side walls, and a front wall that connects the front ends of the side walls. As shown in FIG. 7, the left and right side walls are oriented substantially vertically, and the upper part thereof is smoothly connected to the upper wall while being oriented obliquely.

  The exhaust hole 30 is arranged on the upper left side wall of the bonnet 7 and facing the upper left. Moreover, the exhaust hole 30 is configured by a plurality of through-shaped slits that are arranged in the front-rear direction and are elongated in the substantially vertical direction. The exhaust hole 30 is disposed so as to be positioned in the vicinity of the DPF 19 with the bonnet 7 closed, and has a configuration in which at least a part of the exhaust hole 30 and the DPF 19 overlap in a side view. As a result, the heat released from the DPF 19 is efficiently discharged from the exhaust hole 30, so that problems due to high temperatures are less likely to occur in the devices and parts of the engine room (inside the hood 7).

  The DPF 19 is formed in a cylindrical shape whose axial length is longer than the diameter. The DPF 19 is arranged such that its axial direction is parallel to the front-rear direction of the tractor 6. Therefore, the DPF 19 has a rectangular shape elongated in the front-rear direction when viewed from the side. Thus, since the cylindrical surface of the DPF 19 is arranged so as to face the side wall of the bonnet 7, the projected area of the DPF 19 with respect to the side wall of the bonnet 7 increases, and the area where the DPF 19 and the exhaust hole 30 overlap each other in side view. Can be easily increased. Thereby, the exhaust heat efficiency of an engine room (inside space of the bonnet 7) further improves.

  Next, the arrangement of the air cleaner 15 will be described with reference to FIGS. As described above, the fan shroud 12 is disposed in front of the engine body 1 (in front of the DPF 19), and the air cleaner 15 is disposed in front of the fan shroud 12. The air cleaner 15 is disposed at a position higher than the battery 14 (FIGS. 2 to 5). Accordingly, as shown in FIGS. 7 and 8, when the bonnet 7 is opened, the air cleaner 15 can be easily accessed, so that the maintainability of the air cleaner 15 can be improved.

  A support bar 22 is arranged so as to pass between the capacitor 18 and the battery 14 in the vertical direction (note that the support bar 22 is not shown in FIGS. 1, 6 and 10). . The support bar 22 is fixed to the upper surface of the plate-like mounting plate 16 fixed to the engine frame 11 so that the longitudinal direction thereof is the vertical direction.

  Note that the upper end portion of the support rod 22 is fixed to a support plate 32 fixed to the upper portion of the capacitor frame 31 in order to support the engine controller 2 in a vibration-proof manner. Thereby, the support rod 22 can be attached more firmly.

  A rear portion of the flat support bracket 21 is fixed to the upper portion of the support bar 22 in a cantilever manner. The support bracket 21 is disposed with its thickness direction oriented horizontally. Further, in plan view, the support bracket 21 is arranged so as to be inclined to the left as it approaches the front.

  The air cleaner 15 is fixed to the right side surface of the support bracket 21 with a bolt as a fixture. On the other hand, the sub tank 20 is fixed to the left side surface of the support bracket 21 (the side opposite to the side on which the air cleaner 15 is attached) so as to be inserted into a dedicated fixture. Thus, since the sub tank 20 is fixed to the support bracket 21 to which the air cleaner 15 is fixed, a special support bracket for fixing the sub tank 20 becomes unnecessary. Thereby, since the number of parts can be reduced, cost can be suppressed.

  As shown in FIG. 2 and the like, the air cleaner 15 is disposed so as to be inclined downward. Further, since the air cleaner 15 is attached to the support bracket 21, it is arranged in a direction along the support bracket 21 in a plan view (that is, inclined so as to become left as it approaches the front). Accordingly, as described above, even if the bonnet 7 is formed in a streamlined shape and the width of the front portion of the inner space decreases toward the front, the air cleaner 15 is formed as shown in FIG. Can be easily arranged so as not to interfere with the inner wall of the bonnet 7.

  As described above, the tractor 6 according to this embodiment includes the engine body 1 and includes the DPF 19 and the bonnet 7. The DPF 19 is attached to the upper part of the engine body 1. An exhaust hole 30 is formed in the bonnet 7 so as to at least partially overlap the DPF 19 in a side view. The DPF 19 is arranged at a position that is biased to one side from the center in the left-right direction in the bonnet 7. The exhaust hole 30 is formed at least on the side wall on the same side as the side on which the DPF 19 is disposed, of the left and right side walls of the bonnet 7.

  Thereby, the heat released from the DPF 19 is efficiently discharged from the exhaust hole 30 to the outside of the bonnet 7. As a result, problems due to high temperatures are less likely to occur in devices and members in the engine room (inside the hood 7).

  Further, in the tractor 6 of the present embodiment, the DPF 19 has a columnar shape whose axial length is longer than the diameter, and the axial direction of the DPF 19 is arranged in parallel with the front-rear direction of the tractor 6.

  Thereby, compared with the case where the cylindrical axial direction of DPF19 is arrange | positioned in the left-right direction, the projection area of DPF19 with respect to the side wall of the bonnet 7 becomes large. As a result, it is easy to increase the area where the DPF 19 and the exhaust hole 30 overlap in a side view, and the exhaust heat efficiency in the engine room (the internal space of the bonnet 7) can be further increased.

  Further, in the tractor 6 of the present embodiment, the fan shroud 12 is disposed in front of the engine body 1 and in front of the DPF 19, and the air cleaner 15 is disposed in front of the fan shroud 12.

  Thereby, when the bonnet 7 is opened, it is possible to realize an arrangement that allows easy access to the air cleaner 15. As a result, maintenance of the air cleaner 15 is facilitated. Further, since the heat of the DPF 19 is easily discharged from the exhaust hole 30 as described above, the fan shroud 12 is disposed between the DPF 19 and the air cleaner 15, so that the air cleaner 15 is caused by the heat of the DPF 19. Can be less affected.

  In the tractor 6 of the present embodiment, the air cleaner 15 is fixed to the support bracket 21 disposed in front of the fan shroud 12, and the sub tank 20 that stores the cooling water for the radiator 13 is fixed to the support bracket 21. .

  This eliminates the need for a special support bracket for fixing the sub-tank 20, thereby reducing the number of components and reducing the cost.

  Further, in the tractor 6 of the present embodiment, the support bracket 21 is disposed so as to be inclined to the left and right sides as approaching the front in plan view. In plan view, the air cleaner 15 is disposed to be inclined to the left and right sides so as to follow the direction of the support bracket 21.

  As a result, even when the inner space of the front part of the bonnet 7 becomes narrower as it approaches the front as in this embodiment, the air cleaner 15 interferes with the inner wall of the bonnet 7 with a simple configuration. It can be arranged appropriately so as not to.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  In the present embodiment, the DPF 19 is disposed on the upper left side of the engine body 1, and the exhaust hole 30 of the bonnet 7 is formed at a position near the DPF 19 on the left side surface of the bonnet 7. However, the DPF 19 may be arranged on the upper right side of the engine body, and the exhaust hole 30 may be formed at a position near the DPF 19 on the right side surface of the bonnet 7.

  The shape of the exhaust hole 30 is not limited to the shape shown in FIG. Further, the exhaust holes 30 may be formed not only on the left and right sides of the bonnet 7 but also on both sides.

  In the above embodiment, the air cleaner 15 is fixed to the left side of the support bracket 21, and the sub tank 20 is fixed to the right side of the support bracket 21. However, the air cleaner and the sub tank 20 can be changed to a configuration in which the positions where the air cleaner and the sub tank 20 are fixed to the support bracket 21 are reversed.

  In the above embodiment, the upper end of the support bar 22 is fixed to the support plate 32, but the support bar 22 may not be fixed to the support plate 32. Further, the support rod 22 may be changed to a configuration in which the support rod 22 is directly fixed to the capacitor frame 31. Furthermore, the support bar 22 may be omitted, and the support bracket 21 may be directly fixed to the capacitor frame 31 or the like.

1 Engine body 7 Bonnet 12 Fan shroud 15 Air cleaner 19 DPF
20 Sub tank 21 Support bracket 30 Exhaust hole

Claims (5)

In the tractor equipped with the engine body,
A DPF attached to the top of the engine body;
A bonnet in which an exhaust hole is formed so as to at least partially overlap the DPF in a side view;
With
The DPF is disposed at a position biased to one side from the center in the left-right direction in the bonnet,
The exhaust hole is formed on at least one of the left and right side walls of the bonnet on the same side as the side on which the DPF is disposed. The tractor according to claim 1,
The DPF has a cylindrical shape whose axial length is longer than the diameter, and the axial direction of the DPF is arranged in parallel with the front-rear direction of the tractor. The tractor according to claim 1 or 2,
A fan shroud is disposed in front of the engine body and in front of the DPF,
A tractor, wherein an air cleaner is disposed in front of the fan shroud. The tractor according to claim 3,
The air cleaner is fixed to a support bracket disposed in front of the fan shroud,
A tractor, wherein a sub-tank for storing cooling water for a radiator is fixed to the support bracket. The tractor according to claim 4,
In plan view, the support bracket is arranged to be inclined so as to be on the left and right sides as it approaches the front.
In the plan view, the air cleaner is arranged to be inclined to the left and right sides along the direction of the support bracket.

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