Work vehicles

Abstract

The present invention provides a work vehicle capable of saving space for an air filter device and an exhaust pipe. The work vehicle comprises: an air filter device (60) located in front of a radiator (50) and having a bottom surface (61b) inclined rearward and upward toward the radiator (50) side, for purifying air delivered to an engine (10); and an exhaust pipe (70) extending from the bottom surface of the air filter device (60) to the lower part of the radiator (50) and discharging dust separated by the air filter device (60).

Description

Technical Field

[0001] The present invention relates to the technology of work vehicles. Background Art

[0002] Conventionally, there is known a technology for a work vehicle such as a tractor that includes an air cleaner device for purifying air fed to an engine. For example, Patent Document 1 discloses such a device.

[0003] Patent Document 1 describes a tractor in which an air cleaner is provided in the internal space of an engine hood for removing dust from sucked-in external air and then supplying the air to the engine.

[0004] The air cleaner as described above may be provided with an exhaust pipe for exhausting dust separated from the air by the dust removal process to the outside.

[0005] Yet, when the air cleaner is provided with the above-mentioned discharge pipe, it is necessary to accommodate the air cleaner and the discharge pipe in the limited space in the engine hood. Therefore, it is desirable to save the space of the air cleaner and the discharge pipe.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: (Japanese) Patent Publication No. 2019-217811 Summary of the Invention

[0009] Technical problem to be solved by the invention

[0010] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a work vehicle capable of saving space for an air cleaner device and an exhaust pipe.

[0011] Technical solutions to technical problems

[0012] The problems to be solved by the present invention are as described above. Next, a technical solution for solving the technical problem will be described.

[0013] That is, the work vehicle of the present invention comprises: an air filter device, which is located in front of the radiator and has a bottom surface inclined rearward and upward toward the radiator side, and purifies the air supplied to the engine; and an exhaust pipe, which extends from the bottom surface of the air filter device to the lower part of the radiator and discharges dust separated by the air filter device.

[0014] The air cleaner device includes a first air cleaner portion that separates dust contained in the inhaled air and discharges the dust through the discharge pipe, and a second air cleaner portion that purifies the air from which the dust has been separated by the first air cleaner portion.

[0015] In addition, the exhaust pipe includes a first pipe connected to the air filter device and having flexibility, and a second pipe connected to the first pipe and having an exhaust port for exhausting the dust.

[0016] In addition, the second pipe is formed of a metal material.

[0017] Furthermore, the first pipe has a reduced diameter portion that reduces in diameter from the air cleaner device side toward the second pipe side.

[0018] The radiator further includes a fan for delivering air to the engine and a shroud for covering the fan from the radially outer side and guiding air to the fan. A recessed portion recessed radially outward is formed at a lower portion of the shroud for receiving the second tube.

[0019] Furthermore, an end portion of the second duct including the discharge port is arranged to extend parallel to the rotation axis of the fan.

[0020] Effects of the Invention

[0021] A work vehicle according to an embodiment of the present invention can save space for an air cleaner device and an exhaust pipe.

[0022] A work vehicle according to one embodiment of the present invention can perform efficient air purification.

[0023] A work vehicle according to an embodiment of the present invention can improve the maintainability of a discharge pipe.

[0024] The work vehicle according to one embodiment of the present invention can easily fix the second pipe.

[0025] A work vehicle according to an embodiment of the present invention can easily draw air from an air cleaner device while saving space.

[0026] The work vehicle according to one embodiment of the present invention can easily discharge dust separated by the first air cleaner portion.

[0027] The work vehicle according to one embodiment of the present invention easily sucks dust in the exhaust duct using suction force generated by a fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a side view showing the overall structure of a tractor according to the first embodiment of the present invention.

[0029] Figure 2 It is a perspective view showing various components inside the hood of a tractor.

[0030] Figure 3It is a side view showing various components inside the hood of the tractor.

[0031] Figure 4 This is a perspective view showing the various components inside the hood of the tractor as viewed from the rear.

[0032] Figure 5 It is a rear view showing the radiator.

[0033] Figure 6 It is a perspective view showing the shield.

[0034] Figure 7 It is a side sectional view showing the radiator and the exhaust pipe.

[0035] Figure 8 It is a side sectional view showing a radiator and an exhaust pipe according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0036] In the following, the directions indicated by arrows U, D, F, B, L, and R in the drawings are defined as upward, downward, forward, backward, left, and right, respectively, for explanation.

[0037] Next, use Figure 1 Next, the overall structure of the tractor 1 according to the first embodiment of the present invention will be described.

[0038] The tractor 1 mainly includes a front frame 2 , a transmission 3 , front wheels 4 , rear wheels 5 , an engine hood 6 , a steering wheel 7 , a seat 8 , and an engine 10 .

[0039] The front frame 2 is a frame-shaped member formed by appropriately combining multiple plate members. The front frame 2 is positioned at the front lower portion of the tractor 1, with its longitudinal direction oriented in the front-to-back direction. The engine 10 is secured to the rear of the front frame 2. The transmission 3 is secured to the rear of the engine 10.

[0040] The front portion of the front frame 2 is supported by a pair of left and right front wheels 4 via a front axle mechanism (not shown). The transmission 3 is supported by a pair of left and right rear wheels 5 via a rear axle mechanism (not shown).

[0041] The engine 10 is covered by an engine hood 6. Behind the engine hood 6, a steering wheel 7, a seat 8, various operating elements, pedals, and the like are arranged.

[0042] The power of the engine 10 is shifted by a transmission device (not shown) housed in the transmission 3 and then transmitted to the front wheels 4 through the front axle mechanism and to the rear wheels 5 through the rear axle mechanism. In this way, the front wheels 4 and the rear wheels 5 are driven to rotate by the power of the engine 10, and the tractor 1 can travel.

[0043] Next, refer to Figures 1 to 4 Next, the arrangement of the components inside the engine hood 6 (engine compartment) will be described.

[0044] An engine 10 , a bottom portion 20 , a support portion 30 , a battery 40 , a radiator 50 , an air cleaner device 60 , an exhaust pipe 70 , and a supply pipe 80 are arranged inside the engine cover 6 .

[0045] like Figure 1 As shown, the engine 10 is arranged at the rear of the engine hood 6. The engine 10 is supported by the front frame 2.

[0046] Figure 2 、 Figure 3 and Figure 7 The bottom portion 20 shown forms the front bottom portion of the engine compartment. The bottom portion 20 is formed into a generally plate-like shape with its thickness oriented vertically. The bottom portion 20 is positioned in front of the engine 10. The bottom portion 20 is fixed to the front frame 2. The bottom portion 20 has a raised portion 21.

[0047] The rising portion 21 is a portion rising upward from the rear end portion of the bottom portion 20. The rising portion 21 is formed into a substantially plate shape with its thickness oriented in the front-rear direction. Figure 7 As shown, the rising portion 21 covers the vertical gap between the upper surface of the bottom 20 (the upper surface of the portion other than the rising portion 21) and the lower end of the core 51 of the heat sink 50 described later. The rising portion 21 has a hole 21a.

[0048] Figure 2 and Figure 7 The hole 21a shown penetrates the upright portion 21 in the front-back direction. The hole 21a is formed in a substantially circular shape when viewed in the front-back direction. The second portion 72b of the second pipe 72 described later is inserted through the upright portion 21.

[0049] Figure 2 and Figure 3 The support portion 30 shown supports the radiator 50 and air filter assembly 60, described later. Viewed from the front-to-back direction, the support portion 30 is formed into a generally rectangular frame shape. The support portion 30 is formed by appropriately combining plate-like or rod-like longitudinal members (frames). The support portion 30 is fixed to the upper surface of the rear portion of the base 20.

[0050] Figure 2 and Figure 3 The battery 40 shown can charge and discharge the electric power used by the tractor 1 for starting the engine 10 and the like. The battery 40 is arranged in front of the support portion 30. The battery 40 is fixed to the upper surface of the base portion 20.

[0051] Figures 2 to 5The radiator 50 shown is used to cool the cooling water of the engine 10. The radiator 50 is arranged in front of the engine 10. The radiator 50 is fixed to the support portion 30 via appropriate components. The radiator 50 includes a core 51, a fan 52, and a shroud 53.

[0052] Figure 2 and Figure 3 The core 51 shown is used to perform heat exchange between the cooling water of the engine 10 and the air flowing through the engine cover 6. The core 51 is arranged in front of the engine 10. In addition, the core 51 is arranged behind the bottom 20. Figure 7 As shown, the lower end of the core 51 is located below the upper end of the rising portion 21 of the bottom 20. The core 51 is connected to the water jacket (not shown) of the engine 10 via an appropriate hose or the like.

[0053] Figure 4 and Figure 5 The fan 52 shown delivers (draws) air rearward. The fan 52 is positioned behind the core 51, facing the rear surface of the core 51. The fan 52 is rotatable about an axis extending in the front-to-rear direction. The fan 52 is driven by power transmitted from the engine 10 via a shaft (not shown) of the engine 10.

[0054] Figures 3 to 6 The shroud 53 shown is used to guide air to the fan 52. The shroud 53 is formed in a substantially box shape with an opening in the front-rear direction. The shroud 53 is arranged to cover the core 51 and the fan 52 from the radial outside. The shroud 53 has an opening 53a and a recess 53b.

[0055] The opening 53a is a portion that penetrates the rear surface of the shield 53 and opens to the rear. The opening 53a is formed in a substantially circular shape in a rear view. The opening 53a is formed at a position lower than the center portion of the shield 53 in the vertical direction. Figure 4 and Figure 5 As shown, the fan 52 is arranged inside the opening 53a. Thus, the fan 52 is covered from the radially outer side by the opening 53a of the shroud 53. The inner diameter of the opening 53a is formed to be slightly larger than the outer diameter of the fan 52. Figure 5 and Figure 7 As shown, the inner surface of the opening 53 a is close to the outer peripheral portion of the fan 52 .

[0056] Figure 6 and Figure 7 The recess 53b shown is recessed radially outward (downward) at the lower end of the opening 53a. The recess 53b houses the second tube 72 of the discharge tube 70 described later. The recess 53b is formed into a roughly box-like shape that opens upward and forward. Figure 7As shown, the bottom surface of the recess 53b is formed into a shape extending in the front-rear direction. In addition, the rear surface of the recess 53b is formed into a shape inclined rearward and upward. The interior of the recess 53b is applied with an attraction force generated by the driving of the fan 52.

[0057] The radiator 50 constructed as described above utilizes the drive of the engine 10 to drive the fan 52. As a result, the fan 52 draws air in front of the core 51 (the air circulating in the engine hood 6) and passes it through the core 51, transporting the passed air to the rear. The core 51 performs heat exchange between the air drawn in by the fan 52 and the cooling water, thereby cooling the cooling water. Thus, in this embodiment, the front surface of the radiator 50 (core 51) is formed as an air inlet surface. It should be noted that the radiator 50 of this embodiment is also constructed to draw air in the exhaust pipe 70 of the air filter device 60 described later.

[0058] Figures 2 to 4 The air cleaner device 60 shown draws in and purifies air supplied to the engine 10. The air cleaner device 60 is located in front of the radiator 50. The air cleaner device 60 is formed into a substantially rectangular parallelepiped shape that is longitudinally elongated in one direction (in this embodiment, the oblique front-to-back direction).

[0059] The air filter device 60 draws in air from its front surface (the surface on which the air intake portion 61a, described later, is formed) facing forward and downward. It then discharges purified air from its rear surface (the surface on which the supply pipe connection portion 62a, described later, is formed) facing rearward and upward. The air filter device 60 also has a bottom surface (bottom surface 61b and bottom surface 62b, described later) located between the front and rear surfaces and forming the bottom of the air filter device 60. This bottom surface has a larger area than the front and rear surfaces.

[0060] The air cleaner device 60 is positioned with its bottom surface (bottom surface 61b and bottom surface 62b) tilted upward and rearward, with its bottom surface facing the radiator 50 (diagonally rearward and downward). In other words, the air cleaner device 60 is positioned with its longitudinal direction oriented diagonally in the front-rear direction. The air cleaner device 60 includes a pre-cleaner unit 61 and a main air cleaner unit 62.

[0061] The pre-cleaner 61 removes dust from the inhaled air. It forms the front portion of the air filter unit 60. The pre-cleaner 61 separates dust from the inhaled air and discharges it. The air separated from dust by the pre-cleaner 61 is then supplied to the rear (towards the main air filter 62, described later).

[0062] The pre-cleaner 61 is a cyclone type, and by forming a swirling airflow into the pre-cleaner 61, centrifugal force is applied to separate dust contained in the air. The pre-cleaner 61 includes an air inlet 61a and a bottom surface 61b.

[0063] Figure 2 and Figure 3 The air intake portion 61a shown is the portion that takes in air. The air intake portion 61a is provided on the front surface (the surface facing obliquely front and lower) of the pre-cleaner portion 61. The air intake portion 61a is formed on the front surface of the pre-cleaner portion 61 so as to communicate with the interior of the pre-cleaner portion 61.

[0064] Figure 3 The bottom surface 61b shown is a surface of the pre-cleaner portion 61 that is inclined rearward and upward toward the radiator 50 side (diagonally rearward and downward). The bottom surface 61b has a discharge pipe connecting portion 61c.

[0065] The exhaust pipe connection portion 61c is connected to the exhaust pipe 70 described later. The exhaust pipe connection portion 61c is formed by penetrating the bottom surface 61b and opens toward the radiator 50 (diagonally toward the lower rear side). Dust separated from the air within the pre-cleaner portion 61 is discharged through the exhaust pipe connection portion 61c.

[0066] Figures 2 to 4 The main air cleaner section 62 shown purifies the air by further removing dust from the air separated (dust-removed) by the pre-cleaner section 61. The main air cleaner section 62 constitutes the portion of the air cleaner device 60 located further rearward of the pre-cleaner section 61. The front end of the main air cleaner section 62 is connected to the rear end of the pre-cleaner section 61. The air purified by the main air cleaner section 62 is supplied to the engine 10 via the supply pipe 80 described below.

[0067] The main air cleaner unit 62 purifies the air by passing the air supplied from the pre-cleaner unit 61 through a built-in filter (not shown). The main air cleaner unit 62 includes a supply pipe connecting portion 62a and a bottom surface 62b.

[0068] Figure 2 and Figure 3 The supply pipe connection portion 62a shown is the portion to which the supply pipe 80, described later, is connected. The supply pipe connection portion 62a is formed by penetrating the rear surface (the surface facing obliquely upward and rearward) of the main air cleaner unit 62 and opens toward the obliquely upward and rearward side. Air purified within the main air cleaner unit 62 is discharged through the supply pipe connection portion 62a.

[0069] Figure 3 The bottom surface 62b shown is a surface of the main air cleaner portion 62 that is inclined rearward and upward toward the radiator 50 side (diagonally rearward and downward). The bottom surface 62b has a fixed portion 62c.

[0070] The fixed portion 62c is a portion fixed to the support portion 30. The fixed portion 62c is fixed to the support portion 30 via appropriate stoppers such as bolts.

[0071] Figure 2 、 Figure 3 and Figure 7 The exhaust pipe 70 shown in the figure discharges the dust separated by the pre-cleaner part 61. The exhaust pipe 70 extends obliquely downward and rearward from the bottom surface 61b of the pre-cleaner part 61 to the lower part (recess 53b) of the radiator 50. Figure 2 and Figure 3 As shown, the exhaust pipe 70 is disposed in the space formed between the bottom surface (bottom surface 61b and bottom surface 62b) of the inclined air cleaner device 60 and the front surface of the radiator 50 (the space between the radiator 50 and the battery 40). The exhaust pipe 70 connects the exhaust pipe connection portion 61c of the pre-cleaner unit 61 to the recessed portion 53b of the radiator 50. The exhaust pipe 70 includes a first pipe 71 and a second pipe 72.

[0072] Figure 3 The first tube 71 shown is connected to the discharge pipe connection portion 61c of the pre-cleaner portion 61. The first tube 71 is formed into a generally cylindrical shape. The first tube 71 is flexible. For example, a flexible material such as resin (rubber) can be used to form the first tube 71. The upper end of the first tube 71 is connected to the discharge pipe connection portion 61c, and the lower end is connected to the second tube 72 described later. The first tube 71 has a reduced diameter portion 71a.

[0073] The reduced diameter portion 71a is the portion of the first tube 71 where the diameter decreases from the upstream side (discharge tube connection portion 61c side) to the downstream side (second tube 72 side). The reduced diameter portion 71a is formed so that the flow path area gradually decreases from the upstream side to the downstream side. The illustration shows an example where the reduced diameter portion 71a is located at the upper portion of the first tube 71 (near the discharge tube connection portion 61c).

[0074] like Figure 3 As shown, the first pipe 71 is bent so that its upper portion (reduced diameter portion 71a) extends obliquely rearward and downward from the pre-cleaner portion 61, its middle portion in the vertical direction extends downward (vertically), and its lower portion extends obliquely rearward and downward toward the second pipe 72.

[0075] Figure 2 and Figure 7The second tube 72 shown is a portion that is detachably connected to the first tube 71. The second tube 72 has a generally cylindrical shape, extending in the front-to-back direction and curving diagonally upward at the front. The second tube 72 is formed of a metal material. The second tube 72 connects the first tube 71 to the recessed portion 53b of the radiator 50. Furthermore, the second tube 72 is secured to the upper surface of the base 20 via appropriate components. The second tube 72 includes a first portion 72a, a second portion 72b, and a securing portion 72d.

[0076] The first portion 72a is a portion connected to the lower end portion of the first tube 71. The first portion 72a constitutes the front portion of the first tube 71. The first portion 72a is formed in a shape extending obliquely forward and upward.

[0077] The second portion 72b is a portion connected to the recessed portion 53b of the radiator 50. The second portion 72b constitutes the rear portion of the second tube 72. The second portion 72b is formed into a shape extending in the front-to-back direction. That is, the second portion 72b extends parallel to the rotation axis of the fan 52. Figure 2 and Figure 7 As shown, the second portion 72b is inserted through the hole 21a of the rising portion 21. The rear end of the second portion 72b is received in the interior of the recess 53b. The second portion 72b has a discharge port 72c.

[0078] The discharge port 72c is a portion opened at the rear end portion of the second portion 72b. The second tube 72 communicates with the recessed portion 53b via the discharge port 72c.

[0079] Figure 2 The fixing portion 72d shown is a portion fixed to the bottom 20. The fixing portion 72d is formed by bending a plate-shaped component into a roughly L-shaped shape. A pair of fixing portions 72d are provided on both sides of the second portion 72b in the left and right directions. In this embodiment, one of the roughly L-shaped pieces of the fixing portion 72d is fixed to the second portion 72b by welding, and the other piece is fixed relative to the bottom 20 by fastening with a stopper such as a bolt. It should be noted that the fixing method using the fixing portion 72d is not limited to the above-mentioned example. For example, the fixing portion 72d can be fixed to the second portion 72b by fastening, or it can be fixed to the bottom 20 by welding.

[0080] Figure 2 and Figure 3 The supply pipe 80 shown supplies air cleaned by the main air cleaner unit 62 to the engine 10. The supply pipe 80 is formed into a generally cylindrical shape, extending generally in the front-to-back direction. The front end of the supply pipe 80 is connected to the supply pipe connection portion 62a, and the rear end is connected to the engine 10. In the illustrated example, the supply pipe 80 is provided so as to penetrate the upper portion of the shroud 53 in the front-to-back direction.

[0081] Next, a description will be given of a case where air is supplied to the engine 10 and dust is discharged to the outside in the tractor 1 configured as described above.

[0082] when Figure 1 When the engine 10 shown is driven, the engine 10 attempts to draw air through the air cleaner device 60 and the supply pipe 80. At this time, the air flowing through the engine cover 6 is introduced into the Figure 2 and Figure 3 The air intake portion 61a of the pre-cleaner portion 61 is shown. The air is separated from dust inside the pre-cleaner portion 61.

[0083] The air separated from the dust is supplied to the main air cleaner section 62, where it undergoes further dust removal and purification. This purified air then flows through the supply pipe 80 and is delivered to the engine 10. Thus, air purified by the pre-cleaner section 61 and the main air cleaner section 62 is supplied to the engine 10. In this way, after dust is separated in the pre-cleaner section 61, the air is purified in the main air cleaner section 62, enabling efficient air purification.

[0084] In addition, the dust separated from the air in the pre-cleaner section 61 flows through the exhaust pipe 70 and moves downward. Figure 7 As shown, the second pipe 72 of the discharge pipe 70 is connected to the recessed portion 53b of the shroud 53 of the radiator 50. With this structure, the suction force generated by the fan 52 of the radiator 50 draws dust from the pre-cleaner 61 and the discharge pipe 70. This allows the dust to be easily discharged.

[0085] In addition, if Figure 7 As shown, the recess 53b is provided at the lower end of the opening 53a (near the outer periphery of the fan 52). Here, the outer periphery of the fan 52 has a stronger suction force than the inner periphery. Thus, by providing the recess 53b near the outer periphery of the fan 52, where the suction force is relatively strong, dust in the exhaust pipe 70 can be more effectively sucked out. In addition, in this embodiment, the second portion 72b of the second pipe 72 is arranged to extend parallel to the rotation axis of the fan 52. Thus, because the air in the second pipe 72 is easily sucked in by the suction force generated by the fan 52, dust in the second pipe 72 can be more easily discharged.

[0086] like Figure 7 As shown, the dust discharged through the discharge port 72 c of the second duct 72 passes through the recess 53 b and is transported rearward by the fan 52 , and is discharged to the outside of the tractor 1 through a gap in the engine hood 6 or the like.

[0087] As described above, the tractor 1 (work vehicle) of this embodiment includes: an air filter device 60, which is located in front of the radiator 50 and has a bottom surface 61b that is inclined rearward and upward toward the radiator 50, and purifies the air supplied to the engine 10; and an exhaust pipe 70, which is arranged to extend from the bottom surface of the air filter device 60 to the lower part of the radiator 50 and discharge the dust separated by the air filter device 60.

[0088] This configuration saves space for the air filter device 60 and the exhaust pipe 70. Specifically, the exhaust pipe 70 can be positioned in the space between the inclined bottom surface 61b of the air filter device 60 and the front surface of the radiator 50. This saves space for the air filter device 60 and the exhaust pipe 70, effectively utilizing the space inside the engine hood 6. Furthermore, by extending the exhaust pipe 70 to the bottom of the radiator 50, the dust discharge path faces downward. This makes it less likely for dust to clog the exhaust pipe 70.

[0089] In addition, the air filter device 60 includes: a pre-cleaner section 61 (first air filter section), which separates dust contained in the inhaled air and discharges the dust through the exhaust pipe 70; and a main air filter section 62 (second air filter section), which purifies the air separated from the dust by the pre-cleaner section 61 (first air filter section).

[0090] By configuring in this manner, effective air purification can be performed. That is, after the dust is separated by the pre-cleaner unit 61 (first air cleaner unit), the air is purified by the main air cleaner unit 62 (second air cleaner unit), thereby enabling effective air purification.

[0091] The exhaust pipe 70 includes a first pipe 71 connected to the air filter device 60 and having flexibility, and a second pipe 72 connected to the first pipe 71 and having an exhaust port 72 c for exhausting the dust.

[0092] By configuring in this manner, it is possible to improve the maintainability of the discharge pipe 70. That is, the first pipe 71 can be deformed to perform attachment and detachment and cleaning of each part.

[0093] In addition, the second pipe 72 is formed of a metal material.

[0094] This configuration facilitates securing the second tube 72. Specifically, if the second tube 72 is formed from a relatively low-strength material such as resin, securing the second tube 72 requires not only bolts and other fasteners but also washers, rubber, and other components. This can increase the number of components, complicate assembly and disassembly, and reduce maintainability. On the other hand, by forming the second tube 72 from a relatively high-strength metal material, it can be secured using relatively convenient methods such as fastening or welding. This improves maintainability.

[0095] Furthermore, the first pipe 71 includes a reduced diameter portion 71 a that reduces in diameter from the air cleaner device 60 side toward the second pipe 72 side.

[0096] This configuration facilitates air suction from the air cleaner device 60 and saves space. Specifically, the flow path area on the air cleaner device 60 side of the first pipe 71 (on the exhaust pipe connecting portion 61c side) is relatively large, making air suction easier. Furthermore, the diameter of the second pipe 72 side is reduced, saving space.

[0097] In addition, the radiator 50 has: a fan 52 that supplies air to the engine 10 side, and a shroud 53 that covers the fan 52 from the radial outside and guides air to the fan 52. A recess 53b that is recessed toward the radial outside is formed at the lower part of the shroud 53 to accommodate the second pipe 72.

[0098] By configuring in this manner, the dust separated by the pre-cleaner unit 61 (first air cleaner unit) can be easily discharged. In other words, the dust in the discharge duct 70 can be easily sucked in by the suction force generated by the fan 52 and discharged.

[0099] Furthermore, an end portion of the second duct 72 including the discharge port 72 c is arranged to extend parallel to the rotation axis of the fan 52 .

[0100] With this configuration, the dust in the exhaust duct 70 can be easily sucked out by the suction force generated by the fan 52 .

[0101] It should be noted that the tractor 1 of the present embodiment is one embodiment of the work vehicle of the present invention.

[0102] The pre-cleaner portion 61 of the present embodiment is one embodiment of the first air cleaner portion of the present invention.

[0103] The main air cleaner portion 62 of the present embodiment is one embodiment of the second air cleaner portion of the present invention.

[0104] As mentioned above, the first embodiment of the present invention has been described. However, the present invention is not limited to the above structure, and various modifications can be made within the scope of the invention described in the scope of the patent claims.

[0105] For example, the discharge pipe 70 is not limited to the above-described structure, and may be a discharge pipe 70A of the second embodiment described below.

[0106] Figure 8 The structures of the first tube 71A and the second tube 72A of the discharge tube 70A shown are different from the first tube 71 and the second tube 72 of the discharge tube 70 of the first embodiment.

[0107] like Figure 8 As shown, the first pipe 71A extends obliquely downward and rearward from the pre-cleaner portion 61 at its upper portion (reduced diameter portion 71a), and then bends so that its lower portion (a portion below the reduced diameter portion 71a) extends downward (vertically).

[0108] The second tube 72A is formed so that the first portion 72a extends upward. Specifically, the second tube 72A is formed by bending the first portion 72a at a substantially right angle relative to the second portion 72b extending in the front-to-back direction. As described above, the first portion 72a is connected to the lower end of the vertically extending first tube 71A.

[0109] As described above, the discharge pipe 70 extends the lower portion of the first pipe 71A in the vertical direction (in a straight line), allowing the lower portion to bend forward and backward. This allows the second pipe 72A to easily enter and exit the shield 53 (recessed portion 53b) when the first pipe 71A and second pipe 72A are connected. Furthermore, the first pipe 71A and second pipe 72A can be easily attached and detached.

[0110] While the embodiments of the present invention have been described above, the present invention is not limited to the above configurations, and various modifications can be made within the scope of the invention described in the claims.

[0111] For example, in the above embodiment, the pre-cleaner unit 61 is described as a cyclone type, but the present invention is not limited to the above embodiment. The pre-cleaner unit 61 can adopt various structures that can separate dust contained in the air.

[0112] In the above embodiment, the main air cleaner unit 62 is shown as an example of a structure that purifies air by passing air through a built-in filter, but the present invention is not limited to the above embodiment. Various structures that can purify air can be adopted as the main air cleaner unit 62.

[0113] In the above embodiment, the second tube 72 is fixed to the bottom portion 20 by welding or fastening, but the present invention is not limited to the above method. As a method for fixing the second tube 72, various other methods can be adopted.

[0114] In addition, in the above embodiment, the second tube 72 is fixed to the bottom 20, but the present invention is not limited to the above embodiment. As the fixing location of the second tube 72, various other positions can be adopted.

[0115] In the above embodiment, the tractor 1 is exemplified as the work vehicle, but the present invention is not limited to the above embodiment. For example, the work vehicle may be another agricultural vehicle, a construction vehicle, an industrial vehicle, or the like.

[0116] Industrial Applicability

[0117] The present invention can be applied to a work vehicle.

[0118] Description of Reference Numerals

[0119] 1 Tractor; 50 Radiator; 52 Fan; 53 Shroud; 53b Recess; 60 Air Cleaner Assembly; 61 Pre-Cleanser; 62 Main Air Cleaner; 70, 70A Exhaust Pipe; 71, 71A First Pipe; 72, 72A Second Pipe; 72c Exhaust Port

Claims

1. A working vehicle, characterized in that: have: An air filter device is located in front of the radiator and has a bottom surface that is inclined rearward and upward toward the radiator, and purifies air supplied to the engine; An exhaust pipe is arranged to extend from the bottom surface of the air filter device to the lower part of the radiator, and discharges the dust separated by the air filter device. The discharge pipe has: a first pipe connected to the air filter device and having flexibility; a second pipe connected to the first pipe and having an outlet for discharging the dust, The work vehicle also has: The bottom of the front portion of the engine compartment is arranged in front of the engine and fixed to the front frame, The bottom portion includes a rising portion rising upward at the rear end portion of the bottom portion, The rising portion covers the upper and lower gaps between the upper surface of the bottom and the lower end of the radiator. The second tube is inserted into the rising portion.

2. The work vehicle according to claim 1, wherein: The second tube comprises: a first portion connected to the lower portion of the first tube; a second portion connected to the recessed portion of the heat sink and extending parallel to a rotation axis of a fan of the heat sink; The second tube is fixed to the fixing portion of the bottom.

3. The work vehicle according to claim 1, wherein: The air filter device comprises: a first air filter unit for separating dust contained in the inhaled air and discharging the dust through the discharge pipe; The second air cleaner unit purifies the air from which dust has been separated by the first air cleaner unit.

4. The work vehicle according to claim 3, wherein: The second tube is formed of a metal material.

5. The work vehicle according to claim 3 or 4, characterized in that: The first pipe has a reduced diameter portion that reduces in diameter from the air cleaner device side toward the second pipe side.

6. The work vehicle according to claim 1, wherein: The radiator has: a fan that delivers air to the engine side; a shroud arranged to cover the fan from the radially outer side and guide air toward the fan; A recessed portion recessed toward the radially outer side is formed at a lower portion of the shield to receive the second pipe.

7. The work vehicle according to claim 6, wherein: An end portion of the second duct including the discharge port is arranged to extend parallel to the rotation axis of the fan.

8. The work vehicle according to claim 7, wherein: The second tube is connected to the recess of the shield, The recessed portion is provided at a lower end portion of an opening portion that passes through a rear surface of the shield and opens rearward.

9. A working vehicle, characterized in that: have: An air filter device is located in front of the radiator and has a bottom surface that is inclined rearward and upward toward the radiator, and purifies air supplied to the engine; An exhaust pipe is arranged to extend from the bottom surface of the air filter device to the lower part of the radiator, and discharges the dust separated by the air filter device. The discharge pipe has: a first pipe connected to the air filter device and having flexibility; a second pipe connected to the first pipe and having an outlet for discharging the dust, The exhaust pipe extends obliquely downward and rearward from the bottom surface of the air filter device to the lower portion of the radiator.

10. A working vehicle, characterized in that: have: An air filter device is located in front of the radiator and has a bottom surface that is inclined rearward and upward toward the radiator, and purifies air supplied to the engine; An exhaust pipe is arranged to extend from the bottom surface of the air filter device to the lower part of the radiator, and discharges the dust separated by the air filter device. The discharge pipe has: a first pipe connected to the air filter device and having flexibility; a second pipe connected to the first pipe and having an outlet for discharging the dust, The first tube comprises: an upper portion extending obliquely rearward and downward from the air filter device; The mid-section extending downward in a vertical direction; The lower portion extends obliquely downward and rearward toward the second tube.

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