Tractor

Abstract

To provide a tractor which prevents dust from entering from a suction port and enables increase of the air quantity of cooling air from the suction port to improve cooling efficiency even if the suction port is provided on a floor part of an engine room.SOLUTION: A tractor includes: an engine E; an engine hood forming an engine room ER for housing the engine E; an engine cooling radiator 7 provided at the engine room ER; a cooling fan 8 which is provided adjacent to the radiator 7 at the engine room ER and draws outdoor air to the radiator 7 to cool the radiator 7; a suction port 27 provided on a floor part of the engine room ER; and a dust prevention part 37 which is provided so as to cover the suction port 27, allows ventilation of the outdoor air by driving the cooling fan 8, and prevents passage of dust. The dust prevention part 37 is formed in a three-dimensional shape and configured to enable suctioning from multiple directions.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a tractor provided with an engine, an engine bonnet constituting an engine compartment in which the engine is housed, a radiator for cooling the engine, and a cooling fan for cooling the radiator. [Background technology]

[0002] 2. Description of the Related Art Conventionally, some tractors are provided with an engine, an engine bonnet that constitutes an engine compartment that houses the engine, a radiator for cooling the engine, and a cooling fan that cools the radiator (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-100237 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional tractor, the cooling air for cooling the engine is drawn in from a front grill or a side grill provided on the engine bonnet by driving a cooling fan. In recent years, due to reasons such as increasing the power output of engines, it is desired to improve the cooling efficiency. In order to improve the cooling efficiency, it is desirable to increase the number of intake ports for drawing in the cooling air on the upstream side of the cooling air generated by driving the cooling fan, i.e., the front part of the bonnet, and to increase the volume of the cooling air. However, since the front part of the bonnet already has a front grill and a side grill, and also has equipment such as lights, it is difficult to provide an additional intake port for drawing in the cooling air in the front part of the bonnet.

[0005] Furthermore, when the air intake is provided on the floor of the engine room, there is an inconvenience that the floor of the engine room is close to the ground, and dust rising from the ground during driving can get in through the air intake. To prevent this, it is necessary to provide a dustproof net at the air intake to prevent dust from passing through, but when a dustproof net is provided at the suction port, the cooling air passing through the air intake must pass through a small opening provided in the dustproof net, which reduces the volume of the cooling air.

[0006] The present invention is devised to solve the above-mentioned problems, and aims to provide a tractor that can prevent dust from entering through the air intake, even when the air intake is provided on the floor of the engine compartment, and can increase the volume of cooling air from the air intake, thereby improving cooling efficiency. [Means for solving the problem]

[0007] The present invention is characterized by comprising an engine, an engine bonnet constituting an engine room that houses the engine, a radiator for cooling the engine provided in the engine room, a cooling fan provided in the engine room adjacent to the radiator and drawing in outside air toward the radiator to cool the radiator, an air intake provided in a floor of the engine room, and a dustproof part provided to cover the air intake, allowing the passage of outside air by driving the cooling fan and preventing the passage of dust, left and right aircraft frames extending along a front-rear direction of the aircraft below the engine and supporting the engine; The dustproof part is formed in a three-dimensional shape and configured to be able to suck in dust from multiple directions. The air intake is provided between the left and right aircraft frames. The reason is that...

[0008] According to this characteristic configuration, the cooling air drawn in from the suction port is drawn in through the dustproof part formed three-dimensionally. Since the dustproof part can draw in air from multiple directions, the three-dimensionally formed dustproof part can draw in cooling air from multiple directions. In other words, compared to a dustproof part formed in a plane, it is possible to draw in cooling air by utilizing a larger area of ​​the dustproof part's surface area, increasing the volume of cooling air and improving cooling efficiency.

[0009] In the present invention, it is preferable that the dustproof portion is configured to have a shape that bulges downward from the engine compartment.

[0010] According to this characteristic configuration, the dustproof part bulges downward from the air intake port provided in the floor of the engine room. In other words, since the dustproof part bulges outward from the engine room, it is not necessary to secure a space for providing the dustproof part inside the engine room.

[0011] The present invention Another feature of the tractor is , an engine; an engine bonnet constituting an engine room accommodating the engine; a radiator for cooling the engine provided in the engine room; a cooling fan provided adjacent to the radiator in the engine room and drawing in outside air toward the radiator to cool the radiator; an air intake provided in a floor of the engine room; and a dustproof section provided to cover the air intake, allowing outside air to pass by driving the cooling fan and preventing the passage of dust, the dustproof section being formed in a three-dimensional shape and configured to be able to suck in air from a plurality of directions, and the dustproof section being configured in a shape that bulges downward from the engine room, Left and right machine body frames are provided below the engine, extending along the front-rear direction of the machine body and supporting the engine, and the dustproof section is provided across the left machine body frame and the right machine body frame, and the left and right sides of the dustproof section are blocked by the left and right machine body frames. It is in .

[0012] According to this characteristic configuration, the cooling air drawn in from the suction port is drawn in through the dustproof part formed three-dimensionally. Since the dustproof part can draw in air from multiple directions, the three-dimensionally formed dustproof part can draw in cooling air from multiple directions. In other words, compared to a dustproof part formed in a plane, it is possible to draw in cooling air by utilizing a larger area of ​​the dustproof part's surface area, increasing the volume of cooling air and improving cooling efficiency. According to this characteristic configuration, the dustproof part bulges downward from the air intake port provided in the floor of the engine room. In other words, since the dustproof part bulges outward from the engine room, it is not necessary to secure a space for providing the dustproof part inside the engine room. According to this characteristic configuration, the left and right side walls of the dustproof part are formed by the aircraft frame. Therefore, since the dustproof part does not have left and right side walls, the configuration of the dustproof part can be simplified and the manufacturing process of the dustproof part can be reduced. In addition, since an existing configuration is used, materials for forming the left and right side walls of the dustproof part are not required, which also makes it possible to reduce material costs.

[0013] The present invention The other tractor is characterized in that it is provided with an engine, an engine bonnet constituting an engine room that houses the engine, a radiator for cooling the engine provided in the engine room, a cooling fan that is provided adjacent to the radiator in the engine room and draws in outside air toward the radiator to cool the radiator, an air intake provided in a floor part of the engine room, and a dustproof part that is provided to cover the air intake and allows outside air to pass by driving the cooling fan while preventing the passage of dust, the dustproof part is formed in a three-dimensional shape and configured to be able to suck in air from multiple directions, and the dustproof part is configured in a shape that bulges downward from the engine room, A vertical wall extending in the up-down direction is provided at the front of the dustproof part, and the vertical wall is configured to allow ventilation and prevent the passage of dust. It is in .

[0014] According to this characteristic configuration, the cooling air drawn in from the suction port is drawn in through the dustproof part formed three-dimensionally. Since the dustproof part can draw in air from multiple directions, the three-dimensionally formed dustproof part can draw in cooling air from multiple directions. In other words, compared to a dustproof part formed in a plane, it is possible to draw in cooling air by utilizing a larger area of ​​the dustproof part's surface area, increasing the volume of cooling air and improving cooling efficiency. According to this characteristic configuration, the dustproof part bulges downward from the air intake port provided in the floor of the engine room. In other words, since the dustproof part bulges outward from the engine room, it is not necessary to secure a space for providing the dustproof part inside the engine room. According to this characteristic configuration, the vertical wall portion that allows ventilation is provided in the front part of the dustproof part, and the wind caused by traveling flows toward the vertical wall portion, so that the cooling air can be efficiently sucked in from the vertical wall portion while traveling.

[0015] The present invention The other tractor is characterized in that it is provided with an engine, an engine bonnet constituting an engine room that houses the engine, a radiator for cooling the engine provided in the engine room, a cooling fan that is provided adjacent to the radiator in the engine room and draws in outside air toward the radiator to cool the radiator, an air intake provided in a floor part of the engine room, and a dustproof part that is provided to cover the air intake and allows outside air to pass by driving the cooling fan while preventing the passage of dust, the dustproof part is formed in a three-dimensional shape and configured to be able to suck in air from multiple directions, and the dustproof part is configured in a shape that bulges downward from the engine room, A recessed portion that recesses toward the air intake port is provided at a front lower portion of the dustproof portion, and the recessed portion is configured to allow ventilation while preventing the passage of dust. It is in .

[0016] According to this characteristic configuration, the cooling air drawn in from the suction port is drawn in through the dustproof part formed three-dimensionally. Since the dustproof part can draw in air from multiple directions, the three-dimensionally formed dustproof part can draw in cooling air from multiple directions. In other words, compared to a dustproof part formed in a plane, it is possible to draw in cooling air by utilizing a larger area of ​​the dustproof part's surface area, increasing the volume of cooling air and improving cooling efficiency. According to this characteristic configuration, the dustproof part bulges downward from the air intake port provided in the floor of the engine room. In other words, since the dustproof part bulges outward from the engine room, it is not necessary to secure a space for providing the dustproof part inside the engine room. According to this characteristic configuration, the surface area of ​​the dustproof part is increased by providing the recessed portion. Since the recessed portion has a configuration that allows ventilation, the area that can suck in cooling air is increased, making it possible to suck in more cooling air. Furthermore, since the recessed portion is provided in the front lower part of the dustproof part, the wind generated by traveling flows into the recessed portion. As a result, it is possible to efficiently suck in cooling air from the recessed portion while traveling.

[0017] The present invention The other tractor is characterized in that it is provided with an engine, an engine bonnet constituting an engine room that houses the engine, a radiator for cooling the engine provided in the engine room, a cooling fan that is provided adjacent to the radiator in the engine room and draws in outside air toward the radiator to cool the radiator, an air intake provided in a floor part of the engine room, and a dustproof part that is provided to cover the air intake and allows outside air to pass by driving the cooling fan while preventing the passage of dust, the dustproof part is formed in a three-dimensional shape and configured to be able to suck in air from multiple directions, and the dustproof part is configured in a shape that bulges downward from the engine room, The bottom of the dustproof part is provided with an inclined part that slopes downward toward the rear, and the inclined part is configured to allow ventilation while preventing the passage of dust. It is in .

[0018] According to this characteristic configuration, the cooling air drawn in from the suction port is drawn in through the dustproof part formed three-dimensionally. Since the dustproof part can draw in air from multiple directions, the three-dimensionally formed dustproof part can draw in cooling air from multiple directions. In other words, compared to a dustproof part formed in a plane, it is possible to draw in cooling air by utilizing a larger area of ​​the dustproof part's surface area, increasing the volume of cooling air and improving cooling efficiency. According to this characteristic configuration, the dustproof part bulges downward from the air intake port provided in the floor of the engine room. In other words, since the dustproof part bulges outward from the engine room, it is not necessary to secure a space for providing the dustproof part inside the engine room. According to this characteristic configuration, dust generated inside the engine compartment falls onto the inclined portion provided at the bottom of the dustproof portion. Since the inclined portion is inclined downward toward the rear, the dust slides down toward the rear and collects on the rear side of the inclined portion. In other words, the amount of dust that falls onto the inclined portion is less in places other than the rear side of the inclined portion, and it is possible to reduce the obstruction of ventilation in the inclined portion due to dust. Furthermore, since the dust that falls onto the inclined portion collects on the rear side of the inclined portion, cleaning can be easily performed.

[0019] In the present invention, it is preferable that a lower portion of the dust prevention portion is provided with a downwardly tapered portion having a downwardly tapered shape.

[0020] According to this characteristic configuration, dust generated inside the engine room gathers in the lower narrowing portion provided at the bottom of the dustproof part. There is less dust in the dustproof part other than the lower narrowing portion, so that obstruction of ventilation caused by dust can be reduced. In addition, because dust gathers in the lower narrowing portion, cleaning can be easily performed.

[0021] The present invention The other tractor is characterized in that it is provided with an engine, an engine bonnet constituting an engine room that houses the engine, a radiator for cooling the engine provided in the engine room, a cooling fan that is provided adjacent to the radiator in the engine room and draws in outside air toward the radiator to cool the radiator, an air intake provided in a floor part of the engine room, and a dustproof part that is provided to cover the air intake and allows outside air to pass by driving the cooling fan while preventing the passage of dust, the dustproof part is formed in a three-dimensional shape and configured to be able to suck in air from multiple directions, and the dustproof part is configured in a shape that bulges downward from the engine room, The air intake is configured to open to a position of the floor portion corresponding to a lower end of the radiator, and the dustproof portion extends downward from a portion of the air intake corresponding to the lower end. It is in .

[0022] According to this characteristic configuration, the cooling air drawn in from the suction port is drawn in through the dustproof part formed three-dimensionally. Since the dustproof part can draw in air from multiple directions, the three-dimensionally formed dustproof part can draw in cooling air from multiple directions. In other words, compared to a dustproof part formed in a plane, it is possible to draw in cooling air by utilizing a larger area of ​​the dustproof part's surface area, increasing the volume of cooling air and improving cooling efficiency. According to this characteristic configuration, the dustproof part bulges downward from the air intake port provided in the floor of the engine room. In other words, since the dustproof part bulges outward from the engine room, it is not necessary to secure a space for providing the dustproof part inside the engine room. According to this characteristic configuration, dust falling from the radiator passes through the opening and collects on the dustproof portion, making cleaning easy.

[0023] The present invention The other tractor is characterized in that it is provided with an engine, an engine bonnet constituting an engine room that houses the engine, a radiator for cooling the engine provided in the engine room, a cooling fan that is provided adjacent to the radiator in the engine room and draws in outside air toward the radiator to cool the radiator, an air intake provided in a floor part of the engine room, and a dustproof part that is provided to cover the air intake and allows outside air to pass by driving the cooling fan while preventing the passage of dust, the dustproof part is formed in a three-dimensional shape and configured to be able to suck in air from multiple directions, and the dustproof part is configured in a shape that bulges downward from the engine room, The dustproof section is provided with an opening and a cover that can be switched between a closed state that closes the opening and an open state that opens the opening. It is in .

[0024] According to this characteristic configuration, the cooling air drawn in from the suction port is drawn in through the dustproof part formed three-dimensionally. Since the dustproof part can draw in air from multiple directions, the three-dimensionally formed dustproof part can draw in cooling air from multiple directions. In other words, compared to a dustproof part formed in a plane, it is possible to draw in cooling air by utilizing a larger area of ​​the dustproof part's surface area, increasing the volume of cooling air and improving cooling efficiency. According to this characteristic configuration, the dustproof part bulges downward from the air intake port provided in the floor of the engine room. In other words, since the dustproof part bulges outward from the engine room, it is not necessary to secure a space for providing the dustproof part inside the engine room. According to this characteristic configuration, the inside of the dustproof part can be cleaned using the opening, which makes it possible to easily clean the inside of the dustproof part without the need to remove the dustproof part.

[0025] In the present invention, it is preferable that the air intake is provided at a front portion of the floor portion, and the lid is configured to be swingable about a hinge portion provided at a rear portion of the lid.

[0026] According to this feature, since the air intake is provided at the front of the floor, the dustproof unit and the lid can be easily accessed from the front of the machine, which makes it easy to open and close the lid and clean the inside of the dustproof unit. [Brief description of the drawings]

[0027] [Figure 1] FIG. [Diagram 2] FIG. 2 is a plan view showing a driving part of the tractor. [Diagram 3] FIG. 4 is a front view showing the configuration of the dustproof net. [Figure 4] FIG. 4 is a side view showing the configuration of the dustproof net. [Diagram 5] FIG. 4 is a side view showing the lid in an open state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] An embodiment of the present invention will be described with reference to the drawings. In this embodiment, the forward / backward direction of the machine body is defined along the machine body travel direction in a working state, and the left / right direction of the machine body is defined as viewed in the machine body travel direction. That is, the direction indicated by arrow F in FIG. 1 is the front side of the machine body, and the direction indicated by arrow B in FIG. 1 is the rear side of the machine body. With respect to the forward posture in the forward / backward direction as a reference, the direction corresponding to the right side (the direction indicated by arrow R in FIG. 3) is the right side of the machine body, and the direction corresponding to the left side (the direction indicated by arrow L in FIG. 3) is the left side of the machine body.

[0029] [Overall configuration of the tractor] A tractor is shown in Figure 1. This tractor is equipped with left and right machine frames 1 extending along the front-to-rear direction of the machine body, a wheel-type running device 2 supporting the machine frame 1, a driving section 3 provided on the front part of the machine frame 1, a driving section 4 provided behind the driving section 3, and a cabin 5 covering the driving section 4.

[0030] The traveling device 2 has left and right front wheels 2F that can be steered and driven, and left and right rear wheels 2B that can be driven. The cabin 5 is provided with left and right door panels 5a that are supported at the rear of the cabin 5 so as to be swingable open and closed.

[0031] [About the configuration of the driving part] The driving section 3 is provided with an engine bonnet 6 which constitutes an engine room ER which houses an engine E. A front grille 6a having a large number of air holes is provided on the front part of the engine bonnet 6. A side grille 6b having a large number of air holes is provided on each of the left and right parts of the engine bonnet 6, and an intake section 6c is provided behind the side grille 6b.

[0032] 2, in addition to the engine E, the engine room ER is provided with a radiator 7 for cooling the engine E, a cooling fan 8 for drawing in outside air toward the radiator 7 to cool the radiator 7, a fan shroud 8a for covering the outer periphery of the cooling fan 8, a condenser 9 for condensing a refrigerant in an air conditioner (not shown) for conditioning the interior of the cabin 5, a battery 10, a fuel cooler 11 for fuel for the engine E, and the like. In front of the radiator 7, left and right side covers 12 for covering the lateral outer sides of the condenser 9 and the fuel cooler 11 are provided.

[0033] The machine body frame 1 extends to a position corresponding to the front end of the driving unit 3. The engine E is supported by the machine body frame 1 located below the engine E. A radiator 7 is supported on the machine body frame 1 at a position located forward of the engine E. A front plate 1F is provided at the front end of the machine body frame 1, spanning the left and right machine body frames 1. A lower plate 1D is provided at a position on the lower part of the machine body frame 1, below the radiator 7, cooling fan 8, etc., spanning the left and right machine body frames 1.

[0034] A cooling fan 8 and a fan shroud 8a are provided adjacent to the radiator 7 between the engine E and the radiator 7. A battery mounting stand 21 for mounting and fixing a battery 10 is supported on the upper portion of the vehicle frame 1 at the front end side of the vehicle frame 1. A fuel cooler 11 is provided on the front side between the battery 10 and the radiator 7, and a condenser 9 is provided on the rear side.

[0035] [About the configuration of the battery mounting stand] The battery mounting stand 21 includes a floor portion 22 for mounting the battery 10 thereon, left and right support portions 23 for supporting the battery mounting stand 21 on the machine frame 1, and a battery fixing portion 24 for fixing the battery 10.

[0036] A pair of left and right support parts 23 extending along the front-rear direction of the vehicle are provided below the battery mounting stand 21. The support parts 23 have a front part 23a located at the front side in the front-rear direction of the vehicle, and a rear part 23b located rearward of the front part 23a and configured to extend downward more than the front part 23a. The pair of left and right support parts 23 are fixed with bolts in a state of abutting against the pair of left and right vehicle frames 1 from the inside.

[0037] A floor 22 is located above the pair of left and right body frames 1. The floor 22 is made of a plate-like member extending in the front-rear direction of the body from a position where the radiator 7 of the body frame 1 is supported to a position corresponding to the front end portion of the body frame 1. Although not described in detail, the front portion of the floor 22 is formed into a shape corresponding to the front portion of the engine bonnet 6, and is configured as the floor of the front portion of the engine room ER. The battery 10 is placed on the floor 22 with a cushioning material 25 interposed therebetween.

[0038] The battery fixing portion 24 includes left and right vertical frames 24a extending upward from the floor portion 22. The battery 10 is fixed to the battery mounting base 21 by fasteners 26 supported by the floor portion 22 and upper portions of the left and right vertical frames 24a.

[0039] 2 and 3, the lower surface of the floor portion 22 is provided with an inner reinforcing member 22a that is provided across the left and right support portions 23. On the lower surface of the floor portion 22, left and right outer reinforcing members 22b are provided on the lateral outer sides of the left and right support portions 23.

[0040] 2 and 4, an air intake 27 is provided in the front part of the floor 22 and behind the inner reinforcing member 22a. The air intake 27 is configured to open from a position corresponding to the front part of the battery 10 to a position corresponding to the lower end of the radiator 7 in the front-rear direction of the aircraft. By providing the air intake 27, outside air can be taken in not only through the front grill 6a and side grill 6b provided on the engine bonnet 6, but also through the air intake 27 provided in the floor 22 by driving the cooling fan 8.

[0041] [About the dustproof part configuration] 2 to 4, a dustproof part 31 is provided on the lower surface of the floor part 22 so as to cover the air intake port 27. The dustproof part 31 is configured in a shape that bulges downward from the floor part 22, that is, from the engine room ER.

[0042] The dustproof part 31 has a plurality of faces and is formed in a three-dimensional shape. All faces of the dustproof part 31 are made of punching metal in which many small openings are opened in a flat plate-like member, and are configured to allow ventilation of outside air by driving the cooling fan 8 and to prevent the passage of dust. Specifically, the dustproof part 31 is formed by bending a flat plate material, and is configured to have a shape having a first vertical surface part 31a (corresponding to the "vertical wall part" of the present invention) formed in the front part of the dustproof part 31, a first horizontal surface part 31b extending rearward from the lower end of the first vertical surface part 31a, a second vertical surface part 31c extending downward from the rear end of the first horizontal surface part 31b, an inclined part 31d inclined rearward from the lower end of the second vertical surface part 31c, a rear surface part 31e extending upward from the rear end of the inclined part 31d, and a second horizontal surface part 31f extending rearward from the upper end of the rear surface part 31e. With this configuration, when the cooling fan 8 is driven to draw in outside air, the dustproof portion 31 is configured to be able to draw in air from multiple directions.

[0043] The first vertical surface portion 31a extends downward from a portion of the lower surface of the floor portion 22 that is forward of the inner reinforcing member 22a in the front-rear direction of the aircraft, i.e., a portion forward of the air intake port 27. The first vertical surface portion 31a is configured in a planar shape extending along the up-down direction and the left-right direction of the aircraft. Notches are formed in the upper portions of both the left and right ends of the first vertical surface portion 31a, and the first vertical surface portion 31a is configured not to interfere with the front portions 23a of the left and right support portions 23.

[0044] The first horizontal surface portion 31b is a planar shape extending along the front-rear direction of the body and the left-right direction of the body, and is configured in a rectangular shape. The first horizontal surface portion 31b is located below the lower ends of the front portions 23a of the left and right support portions 23. The second vertical surface portion 31c is a planar shape extending along the up-down direction of the body and the left-right direction of the body, and is configured in a rectangular shape. The second vertical surface portion 31c is located forward of the front ends of the rear portions 23b of the left and right support portions 23. The first horizontal surface portion 31b and the second vertical surface portion 31c form a recessed portion Q in the front lower portion of the dustproof portion 31 that recesses toward the air intake port 27.

[0045] Inclined portion 31d has a planar shape and is located at the bottom of dustproof portion 31. Rear surface portion 31e has a planar shape and is configured to extend downward from a portion of intake port 27 that corresponds to the lower end of condenser 9. Rear surface portion 31e and inclined portion 31d form a downward tapering portion C at the bottom of dustproof portion 31.

[0046] The second horizontal surface portion 31f extends rearward from the upper end of the rear surface portion 31e along the lower surface of the floor portion 22. The rear end of the second horizontal surface portion 31f extends to a location on the lower surface of the floor portion 22 that is located rearward of the rear end of the air intake port 27.

[0047] Two stays 28 extending downward from the bottom surface of the floor 22 are provided at a location of the floor 22 corresponding to the first vertical surface 31a. The two stays 28 are arranged at a predetermined interval along the left-right direction of the machine body. The front side of the stay 28 and the rear side of the first vertical surface 31a are fastened and fixed by a bolt Bo in a state of abutment. In addition, between the left and right ends of the rear part of the intake port 27 on the lower side of the floor 22 and the left and right ends of the second horizontal surface 31f, the lower side of the floor 22 and the upper side of the second horizontal surface 31f are in a state of abutment. At the location where the lower side of the floor 22 and the upper side of the second horizontal surface 31f are abutted, they are fastened and fixed by a bolt Bo at a predetermined interval along the left-right direction of the machine body. With this configuration, the dustproof part 31 is supported by the lower side of the floor 22.

[0048] The dustproof part 31 is provided across the left and right machine frames 1. The dustproof part 31 does not have side parts that face the left and right machine frames 1, and the left and right sides of the dustproof part 31 are blocked by the left and right machine frames 1.

[0049] Further, gap filling members 13 are attached to the upper surfaces of the left and right body frames 1. As the gap filling members 13, front gap filling members 13a that close the gap occurring between the upper ends of the front parts of the left and right body frames 1 and the lower ends of the front parts 23a of the support parts 23, and rear gap filling members 13b that close the gap occurring between the rear ends of the rear parts 23b of the support parts 23 and the rear surface part 31e of the dustproof part 31 are provided on the left and right, respectively.

[0050] [Configuration of the opening and lid] An opening 32 is formed in the rear portion of the inclined portion 31d. The opening 32 is configured to be switchable between a closed state in which the opening 32 is closed and an open state in which the opening 32 is open by a lid 33. A trim 34 is attached around the entire periphery of the edge of the opening 32. In the closed state, the trim 34 is configured to be in close contact with the lid 33.

[0051] The cover 33 has a shape corresponding to the shape of the lower narrowing portion C. Specifically, the cover 33 is formed by bending a flat plate material, and has a first surface portion 33a facing the inclined portion 31d and a second surface portion 33b facing the rear surface portion 31e. The cover 33 is made of punching metal, and is configured to allow ventilation of outside air by driving the cooling fan 8 and to prevent the passage of dust. In the closed state, the trim 35 is attached to a portion of the edge of the cover 33 forward of the portion with which the trim 34 is in close contact. The trim 35 is configured to be in close contact with the inclined portion 31d in the closed state.

[0052] As shown in FIG. 2, the rear surface portion 31e is provided with two hinge portions 36 that allow the lid body 33 to swing. As shown in FIG. 3 and FIG. 4, the two hinge portions 36 are arranged on the rear surface portion 31e with a predetermined interval therebetween along the left-right direction of the machine body. The left and right hinge portions 36 are formed of rod-shaped members and are fixed in a state in which they penetrate the rear surface portion 31e. The hinge portions 36 extend rearward from the rear surface portion 31e and have a bent portion 36a (see FIG. 5) that bends at approximately the center of the hinge portions 36 in the front-rear direction. The rear side of the bent portion 36a of the hinge portions 36 is inclined upward toward the rear.

[0053] Two openings 37 are formed in the second surface portion 33b of the lid body 33. The two openings 37 are formed at positions corresponding to the left and right hinge portions 36 provided on the rear surface portion 31e. The left and right hinge portions 36 are respectively inserted into the two openings 37 of the lid body 33, so that the lid body 33 is suspended from the left and right hinge portions 36 and supported so as to be swingable around the hinge portions 36.

[0054] Support holes are formed in the front portion of the first surface portion 33a of the lid 33 and in the portion of the inclined portion 31d that is forward of the opening 32. When the knob bolt 39 is inserted through the support hole of the first surface portion 33a and the support hole of the inclined portion 31d and bolted, the lid 33 is supported by the dustproof portion 31 by the left and right hinge portions 36 and the knob bolt 39, and the closed state can be maintained. Also, the open state can be achieved by releasing the bolt fixing by the knob bolt 39.

[0055] As shown in FIG. 5, when the cover 33 is switched from the closed state to the open state, the cover 33 swings counterclockwise in FIG. 5, and the upper edge of the opening 37 slides rearward on the upper side of the hinge portion 36. Here, the distance from the upper edge of the opening 37 to the upper end of the second surface portion 33b is configured to be longer than the distance from the bent portion 36a of the hinge portion 36 to the rear surface portion 31e. The upper end of the second surface portion 33b abuts against the rear surface portion 31e of the dustproof portion 31, and the upper edge of the opening 37 is caught by the bent portion 36a of the hinge portion 36, and the swing of the cover 33 stops, completing the switching of the cover 33 from the closed state to the open state. In this state, the center of gravity G of the cover 33 is configured to be located forward of the bent portion 36a with which the upper edge of the opening 37 abuts in the front-rear direction of the machine. With this configuration, a swinging force SF acts on the lid 33 in the tangent direction of a circle CL having the abutment point P as its central axis, from an imaginary line L2 connecting the center of gravity G and the abutment point P where the hinge portion 36 and the upper edge portion of the opening 37 abut, toward an imaginary line L1 in the direction of gravity that passes through the abutment point P. The swinging force SF causes the upper end portion of the second surface portion 33b to rotate counterclockwise in FIG. 5 around the abutment point P as an axis, but is prevented from doing so by the rear surface portion 31e. As a result, the lid 33 is maintained in the open state.

[0056] [Another embodiment] The following are examples of other embodiments in which the above-described embodiment has been modified. The following embodiments may be combined with each other and applied to the above-described embodiment, provided that no contradiction occurs. Note that the scope of the present invention is not limited to the contents of each embodiment.

[0057] (1) In the above embodiment, the dustproof section 31 is described as being configured in a shape that bulges downward from the engine room ER. However, the present invention is not limited to the above embodiment. For example, the dustproof section 31 may be configured in a shape that bulges upward from the engine room ER.

[0058] (2) In the above embodiment, the dustproof section 31 does not have side portions facing the left and right body frames 1, and the left and right sides of the dustproof section 31 are blocked by the left and right body frames 1. However, the present invention is not limited to the above embodiment. For example, the dustproof section 31 may be configured to have side portions facing the left and right body frames 1.

[0059] (3) In the above embodiment, a configuration including a first vertical surface portion 31a formed on the front part of the dustproof portion 31 was described as an example. However, the present invention is not limited to the above embodiment. For example, the dustproof portion 31 may be configured not to include a vertical surface portion extending in the up-down direction on the front part of the dustproof portion 31.

[0060] (4) In the above embodiment, a configuration has been described in which the front-lower part of the dustproof part 31 is provided with a recessed portion Q that recesses toward the air intake port 27. However, the present invention is not limited to the above embodiment. For example, the dustproof part 31 may be configured not to have a recessed portion Q that recesses toward the air intake port 27 in the front-lower part.

[0061] (5) In the above embodiment, an example was described in which the bottom of the dustproof section 31 is provided with an inclined portion 31d that slopes downward to the rear. However, the present invention is not limited to the above embodiment. For example, the bottom of the dustproof section 31 may not be provided with an inclined portion 31d that slopes downward to the rear, but may instead be provided with a bottom that extends horizontally.

[0062] (6) In the above embodiment, a configuration in which the lower part of the dustproof part 31 is provided with a downwardly tapered portion C having a downwardly tapered shape is described as an example. However, the present invention is not limited to the above embodiment. For example, the lower part of the dustproof part 31 may be configured not to be provided with a downwardly tapered portion C having a downwardly tapered shape.

[0063] (7) In the above embodiment, the rear surface 31e of the dustproof part 31 is configured to extend downward from a portion of the intake port 27 that corresponds to the lower end of the condenser 9. However, the present invention is not limited to the above embodiment, and for example, the rear surface 31e of the dustproof part 31 may be configured to extend downward from a portion of the intake port 27 that corresponds to the lower end of the radiator 7. In addition, the rear surface 31e may be configured to be inclined downward toward the front.

[0064] (8) In the above embodiment, an opening 32 is formed in the rear portion of the inclined portion 31d of the dustproof portion 31, a lid body 33 is provided that can be switched between a closed state that blocks the opening 32 and an open state that opens the opening 32, and a hinge portion 36 is provided on the rear surface portion 31e. However, the present invention is not limited to the above embodiment, and, for example, a configuration may be used in which an opening 32 is formed in the rear surface portion 31e of the dustproof portion 31 and a hinge portion 36 is provided on the inclined portion 31d of the dustproof portion 31, or a configuration in which the dustproof portion 31 does not include an opening 32 and a lid body 33.

[0065] (9) In the above embodiment, the hinge portion 36 is described based on an example in which it is composed of a rod-shaped member. However, the present invention is not limited to the above embodiment. For example, the hinge portion 36 may be composed of a hinge.

[0066] (10) In the above embodiment, a configuration in which the seat belt is provided at the front part of the floor portion 22 has been described as an example, however, the present invention is not limited to the above embodiment, and may be, for example, a configuration in which the seat belt is provided at the rear part of the floor portion 22. [Industrial Applicability]

[0067] The present invention is applicable to a tractor provided with an engine, an engine bonnet that constitutes an engine compartment that houses the engine, a radiator for cooling the engine, and a cooling fan that cools the radiator. [Explanation of symbols]

[0068] 1: Aircraft frame 6: Engine bonnet 7: Radiator 8: Cooling fan 22: Floor part 27: Air intake 31: Dustproof section 31a: First vertical surface part (vertical wall part) 31d: Inclined part 32: Opening 33: Lid 36: Hinge part E: Engine ER: Engine room C: Lower narrowing Q: Recessed part

Claims

1. The engine, an engine bonnet that constitutes an engine room that houses the engine; a radiator for cooling an engine provided in the engine compartment; a cooling fan provided adjacent to the radiator in the engine compartment and configured to draw in outside air toward the radiator to cool the radiator; an intake port provided in a floor portion of the engine room; a dustproof part that is provided to cover the air intake port and allows outside air to pass through when the cooling fan is driven and prevents dust from passing through; left and right aircraft frames provided below the engine, extending along a front-rear direction of the aircraft, and supporting the engine; The dustproof part is formed in a three-dimensional shape and configured to be able to suck in dust from multiple directions, The tractor, wherein the air intake is provided between the left and right body frames.

2. The tractor according to claim 1 , wherein the dustproof portion is configured to bulge downward from the engine compartment.

3. An engine, an engine bonnet that constitutes an engine room that houses the engine; a radiator for cooling an engine provided in the engine compartment; a cooling fan provided adjacent to the radiator in the engine compartment and configured to draw in outside air toward the radiator to cool the radiator; an intake port provided in a floor portion of the engine room; a dustproof part that is provided to cover the air intake port and allows ventilation of outside air by driving the cooling fan and prevents the passage of dust, The dustproof part is formed in a three-dimensional shape and configured to be able to suck in dust from multiple directions, The dustproof portion is configured to bulge downward from the engine compartment, left and right aircraft frames extending along a front-rear direction of the aircraft and supporting the engine are provided below the engine, the dustproof portion is provided across the left body frame and the right body frame, A tractor in which the left and right sides of the dustproof section are blocked by the left and right body frames.

4. An engine, an engine bonnet that constitutes an engine room that houses the engine; a radiator for cooling an engine provided in the engine compartment; a cooling fan provided adjacent to the radiator in the engine compartment and configured to draw in outside air toward the radiator to cool the radiator; an intake port provided in a floor portion of the engine room; a dustproof part that is provided to cover the air intake port and allows ventilation of outside air by driving the cooling fan and prevents the passage of dust, The dustproof part is formed in a three-dimensional shape and configured to be able to suck in dust from multiple directions, The dustproof portion is configured to bulge downward from the engine compartment, A vertical wall portion extending along the up-down direction is provided at the front portion of the dustproof portion, The vertical wall portion is configured to allow ventilation while preventing the passage of dust.

5. An engine, an engine bonnet that constitutes an engine room that houses the engine; a radiator for cooling an engine provided in the engine compartment; a cooling fan provided adjacent to the radiator in the engine compartment and configured to draw in outside air toward the radiator to cool the radiator; an intake port provided in a floor portion of the engine room; a dustproof part that is provided to cover the air intake port and allows ventilation of outside air by driving the cooling fan and prevents the passage of dust, The dustproof part is formed in a three-dimensional shape and configured to be able to suck in dust from multiple directions, The dustproof portion is configured to bulge downward from the engine compartment, A recessed portion recessed toward the intake port is provided at a front lower portion of the dustproof portion, The recess is configured to allow ventilation while preventing the passage of dust.

6. An engine, an engine bonnet that constitutes an engine room that houses the engine; a radiator for cooling an engine provided in the engine compartment; a cooling fan provided adjacent to the radiator in the engine compartment and configured to draw in outside air toward the radiator to cool the radiator; an intake port provided in a floor portion of the engine room; a dustproof part that is provided to cover the air intake port and allows ventilation of outside air by driving the cooling fan and prevents the passage of dust, The dustproof part is formed in a three-dimensional shape and configured to be able to suck in dust from multiple directions, The dustproof portion is configured to bulge downward from the engine compartment, The bottom of the dustproof part is provided with an inclined part that slopes downward toward the rear, The inclined portion is configured to allow ventilation while preventing the passage of dust.

7. The tractor according to any one of claims 2 to 6, wherein a lower portion of the dustproof part is provided with a downwardly tapered portion having a downwardly tapered shape.

8. An engine, an engine bonnet that constitutes an engine room that houses the engine; a radiator for cooling an engine provided in the engine compartment; a cooling fan provided adjacent to the radiator in the engine compartment and configured to draw in outside air toward the radiator to cool the radiator; an intake port provided in a floor portion of the engine room; a dustproof part that is provided to cover the air intake port and allows ventilation of outside air by driving the cooling fan and prevents the passage of dust, The dustproof part is formed in a three-dimensional shape and configured to be able to suck in dust from multiple directions, The dustproof portion is configured to bulge downward from the engine compartment, The air intake is configured to open to a position in the floor portion corresponding to a lower end of the radiator, The dustproof portion extends downward from a portion of the air intake port that corresponds to the lower end portion.

9. An engine, an engine bonnet that constitutes an engine room that houses the engine; a radiator for cooling an engine provided in the engine compartment; a cooling fan provided adjacent to the radiator in the engine compartment and configured to draw in outside air toward the radiator to cool the radiator; an intake port provided in a floor portion of the engine room; a dustproof part that is provided to cover the air intake port and allows ventilation of outside air by driving the cooling fan and prevents the passage of dust, The dustproof part is formed in a three-dimensional shape and configured to be able to suck in dust from multiple directions, The dustproof portion is configured to bulge downward from the engine compartment, The dustproof section is provided with an opening, and a cover body switchable between a closed state for closing the opening and an open state for opening the opening.

10. The air intake is provided at the front of the floor, The tractor according to claim 9, wherein the cover is configured to be swingable about a hinge portion provided at a rear portion of the cover.

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