Work vehicle

Abstract

To facilitate access to an engine compartment.SOLUTION: A work vehicle comprises: a cooling fan provided on a vehicle body frame which has a fan rotation shaft extending along a fan rotation axis and a plurality of blades arranged around the fan rotation shaft in a radial direction relative to the fan rotation axis and configured to rotate the plurality of blades around the fan rotation axis and generate cooling air; a first shroud which is connected to the vehicle body frame between the plurality of blades and a support wall, covers a part of the radial outer side of a motion range of the plurality of blades, has a first shape that is approximately arc-shaped when viewed in an axial direction along the fan rotation axis, and extends in the axial direction; a heat exchanger which has a first surface and a second surface opposite to the first surface in a thickness direction, and is supported by the support frame so that the second surface faces the support frame and is exposed; and a second shroud which includes a base end covering an outer periphery of the first surface of the heat exchanger and a terminal end having a second shape that is approximately arc-shaped and extending in the thickness direction.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a work vehicle.

Background Art

[0002] Patent Document 1 discloses a work vehicle including a radiator fan provided in an engine room and a radiator provided in a member that can be opened and closed with respect to the engine room. This work vehicle has a feature that when the member provided with the radiator is opened, access to the engine room becomes easy.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the work vehicle of Patent Document 1, a shroud for guiding the wind generated by the radiator fan is provided on a member that can be opened and closed. When opening and closing, a part of the shroud is cut out so that the shroud does not contact the fan.

[0005] The problem of the technology disclosed in the present application is to prevent the cooling efficiency from being reduced by suppressing the outflow of the wind generated by the fan from the cutout portion of the shroud without impairing the feature that access to the engine room becomes easy when the member provided with the radiator is opened, and to provide a work vehicle capable of improving the cooling efficiency of the heat exchanger.

Means for Solving the Problems

[0006] The work vehicle according to the first aspect of the present disclosure includes a vehicle body frame, a hinge, a support frame, a cooling fan, a first shroud, a heat exchanger, and a second shroud. The vehicle body frame includes a support wall and has an opening with the support wall as a part of the outer periphery. The hinge is provided on the support wall. The support frame is supported by the hinge so as to be rotatable around the hinge rotation axis. The cooling fan is provided on the vehicle body frame. The cooling fan includes a fan rotation shaft and a plurality of blades. The fan rotation shaft extends along a fan rotation axis that passes through the opening and is in a twisted position with respect to the frame rotation axis. The plurality of blades are provided around the fan rotation shaft in the radial direction with respect to the fan rotation axis. The cooling fan is configured to rotate the plurality of blades around the fan rotation axis to generate cooling air. The first shroud is connected to the vehicle body frame between the plurality of blades and the support wall. The first shroud covers a part of the outer side in the radial direction of the movable range of the plurality of blades. The first shroud has a first shape that is substantially circular arc-shaped when viewed in the axial direction along the fan rotation axis. The shroud extends in the axial direction. The heat exchanger has a first surface and a second surface opposite to the first surface in the thickness direction. The heat exchanger is supported by the support frame such that the second surface faces the support frame. The second shroud includes a base end portion and a distal end portion. The base end portion covers the outer periphery of the first surface of the heat exchanger. The distal end portion has a second shape that is substantially arc-shaped and extends in the thickness direction. When the support frame is positioned at a first position where the heat exchanger faces the cooling fan, the first shroud abuts against the distal end portion of the second shroud, and the first shroud and the distal end portion of the second shroud cover the outer periphery in the radial direction of the movable range. When the support frame is positioned at a second position where the heat exchanger exposes the opening to the outside of the vehicle body frame, the fan rotation shaft, the plurality of blades, and the first shroud are exposed.

Advantages of the Invention

[0007] According to the technology disclosed in the present application, for example, when a member provided with a radiator is opened, it is possible to provide a work vehicle that facilitates access to the engine room and improves the cooling efficiency of the heat exchanger.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

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Figure 6

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Figure 8

Figure 9

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Figure 11

Figure 12

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Similar reference numerals indicate corresponding or identical configurations in each figure. <First Embodiment>

[0010] Referring to FIG. 1, the work vehicle 1 includes a vehicle body frame 2, a traveling device 3, a working device 4, and a cabin 5. The vehicle body frame 2 supports the traveling device 3, the working device 4, and the cabin 5. In the illustrated embodiment, the traveling device 3 is a crawler-type traveling device. However, the traveling device 3 is not limited to a crawler-type traveling device. The traveling device 3 may be, for example, a front-wheel and rear-wheel traveling device, or a traveling device having a front wheel and a rear crawler. The working device 4 includes an implement (bucket) 41 at the distal end of the working device 4. The proximal end of the working device 4 is attached to the rear portion of the vehicle body frame 2. The working device 4 includes a pair of arms 42 that rotatably support the implement (bucket) 41 via a bucket rotation shaft 43. Each of the pair of arms 42 includes a lift link 44 and a boom 45. The lift link 44 is rotatable relative to the vehicle body frame 2 about a first pivot pin 46. The boom 45 is rotatable relative to the lift link 44 about a second pivot pin 47. The working device 4 further includes a boom cylinder 48 and at least one implement cylinder 49. Each boom cylinder 48 is rotatably connected to the vehicle body frame 2 and the boom 45, and operates the lift link 44 and the boom 45 to raise and lower the implement (bucket) 41. At least one implement cylinder 49 is configured to tilt the implement (bucket) 41. The cabin 5 is attached to the front portion of the vehicle body frame 2. The work vehicle 1 includes a front door 51 provided at the front of the cabin 5, and a driver's seat 52 and an operating device (not shown) provided inside the cabin 5.

[0011] In the illustrated embodiment, one of the pair of arms 42 is provided on the left side of the cabin 5. The other of the pair of arms 42 is provided on the right side of the cabin 5. Specifically, one of the boom cylinder 48 and the boom 45 is provided on the left side of the cabin 5. The other boom cylinder 48 and the other boom 45 are provided on the right side of the cabin 5. FIG. 1 shows the left side of the work vehicle 1. However, the left and right sides of the work vehicle 1 are substantially symmetrical.

[0012] The work vehicle 1 further includes an engine 6, a heat exchanger 7, a first shroud 10, a second shroud 15, and a cooling fan 20 provided on a vehicle body frame 2. The engine 6 is configured to apply a driving force to a traveling device 3 and a work device 4. The heat exchanger 7 includes a radiator that cools the cooling water of the engine 6. Further, preferably, the heat exchanger 7 includes an oil cooler that cools the hydraulic oil used in the hydraulic system of the work vehicle 1 (for example, a boom cylinder and at least one implement cylinder 49). The cooling fan 20 is configured to generate cooling air for cooling the heat exchanger 7. The first shroud 10 and the second shroud 15 are configured to cover the outer periphery of the cooling fan 20 so as to efficiently send the cooling air to the heat exchanger 7. The engine 6, the heat exchanger 7, the first shroud 10, the second shroud 15, and the cooling fan 20 are provided between a pair of arms 42 in the left-right direction of the work vehicle 1. The engine 6, the heat exchanger 7, the first shroud 10, the second shroud 15, and the cooling fan 20 are provided between boom cylinders 48 in the left-right direction of the work vehicle 1.

[0013] The work vehicle 1 further includes a bonnet cover 9. The bonnet cover 9 is provided at the rear end of the vehicle body frame 2 and covers an opening 82. FIG. 2 is a partial rear view of the periphery of the bonnet cover 9 of the work vehicle 1. Referring to FIG. 2, the bonnet cover 9 is swingable about a cover rotation axis line Axc. In FIG. 2, since a hinge 91 for rotating the bonnet cover 9 exists on the back side of the bonnet cover 9, the hinge 91 is illustrated by a dotted line. The vehicle body frame 2 includes an upper cover 8 above and in front of the bonnet cover 9. The upper cover 8 is openable and closable.

[0014] FIG. 3 is a partial rear view of the work vehicle 1 when the bonnet cover 9 is removed. Referring to FIGS. 1 and 3, the vehicle body frame 2 includes a support wall 81 and has an opening 82 with the support wall 81 as a part of its outer periphery. The vehicle body frame 2 forming the opening 82 covers the front and peripheral portions of the engine 6 and the cooling fan 20. FIG. 4 is a view of the engine 6, the cooling fan 20, the first shroud 10, the second shroud 15, and the heat exchanger 7. FIG. 5 is a perspective view showing the cooling fan 20, the first shroud 10, the second shroud 15, and the heat exchanger 7. FIG. 6 is an enlarged view showing the cooling fan 20, the first shroud 10, the second shroud 15, and the heat exchanger 7. In FIGS. 3 to 4, illustration of the pair of arms 42 is omitted. Referring to FIGS. 3 to 5, the heat exchanger 7 has a first surface 71 and a second surface 72 opposite to the first surface 71 in the thickness direction Dt. Referring to FIGS. 4 and 5, the second shroud 15 includes a base end portion 16 covering the outer periphery of the first surface 71 of the heat exchanger 7 and a distal end portion 17 having a second shape that is substantially arc-shaped when viewed from the thickness direction Dt. Note that the second shape is the shape of the inner peripheral surface of the distal end portion 17 when viewed in the thickness direction Dt. The second shroud 15 has a cylindrical shape extending in the thickness direction Dt from the base end portion 16 to the distal end portion 17.

[0015] Referring to FIG. 3, the work vehicle 1 further includes a support frame 30 and a hinge 93. The support frame 30 supports the heat exchanger 7 and the first shroud 10 so as to expose the end portion 17 and the second surface 72. As shown in FIGS. 3, 5, and 6, the support frame 30 is a frame-shaped member that surrounds the outer peripheral surface connecting the first surface 71 and the second surface 72 of the heat exchanger 7. Referring to FIG. 3, the hinge 93 is provided on the support wall 81. The hinge 93 is connected to the support frame 30. The support frame 30 is supported by the hinge 93 so as to be rotatable about a hinge rotation axis Axh that is substantially parallel to the wall surface of the support wall 81. More specifically, the hinge 93 has a hinge rotation axis Axh, includes a hinge rotation shaft 94 that extends along the hinge rotation axis Axh and is swingable integrally with the support frame 30, and a shaft support plate 95 that is fixed to the support wall 81 and has a through hole through which the hinge rotation shaft 94 passes. Thereby, the support frame 30 can be opened and closed so that the heat exchanger 7 can be rotated rearward, and maintenance workers can perform maintenance work on the heat exchanger 7 and the engine 6.

[0016] Referring to FIGS. 3 to 6, the cooling fan 20 includes a fan rotation shaft 21 and a plurality of blades 22. The fan rotation shaft 21 extends along a fan rotation axis Axf passing through the opening 82. As shown in FIG. 3 and the like, the fan rotation axis Axf and the hinge rotation axis Axh are skew lines. In the present embodiment, the hinge rotation axis Axh, the fan rotation axis Axf, and the width direction Dw are substantially perpendicular to each other. Preferably, when the fan rotation axis Axf is projected onto the plane including the hinge rotation axis Axh, the projected line is perpendicular to the hinge rotation axis Axh. However, when the fan rotation axis Axf is projected onto the plane including the hinge rotation axis Axh, the projected line is perpendicular to the hinge rotation axis Axh. The plurality of blades 22 are provided around the fan rotation shaft 21 in the radial direction with respect to the fan rotation axis Axf. The cooling fan 20 is configured to rotate the plurality of blades 22 around the fan rotation axis Axf to generate cooling air.

[0017] 4, the first shroud 10 is connected to the vehicle body frame 2 between the plurality of blades 22 and the support wall 81, and covers a part of the radially outer side of the movable range 24 of the plurality of blades 22. Referring to FIG. 5, the first shroud 10 is arranged in the axial direction D along the fan rotation axis Axf. AX The first shape is substantially arc-shaped when viewed from the outside, and AX The first shape is such that the inner circumferential surface of the first shroud 10 extends in the axial direction D AX 6, the first shroud 10 is supported on the body frame 2 via stays 14. When the support frame 30 is located at a first position P1 where the heat exchanger 7 faces the cooling fan 20, the end portions 17 of the first shroud 10 and the second shroud 15 cover the outer periphery of the movable range 24 in the radial direction.

[0018] 6, the radius R2 of the second shape is substantially equal to the radius R1 of the first shape. When the support frame 30 is located at the first position P1, the center C1 of the first shape and the center C2 of the second shape substantially coincide with each other. The centers C1 and C2 are located on the fan rotation axis Axf. The central angle θ2 of the second shape is 180 degrees or more, and the central angle θ1 of the first shape is 180 degrees or less. The distance L2 between the two end points E3 and E4 of the approximately arc shape of the second shape is 180 degrees or less in the axial direction D. AX Diameter L of the range of motion 24 24 The distance L1 between the two end points E1 and E2 of the substantially arcuate shape of the first shape is greater than the diameter L of the movable range 24. 24 A gap 18 is provided between the two end points E1 and E3 to prevent collision between the first shroud 10 and the second shroud 15 due to rattle of the hinge 93. A gap 19 is provided between the two end points E2 and E4 to prevent collision between the first shroud 10 and the second shroud 15 due to rattle of the hinge 93.

[0019] FIG. 7 is a cross-sectional view taken along the cutting plane line VII-VII' of FIG. 6. Referring to FIG. 7, when the support frame 30 is located at the first position P1 where the heat exchanger 7 faces the cooling fan 20, the first shroud 10 abuts against the base end portion 16 of the second shroud 15. More specifically, referring to the enlarged view of region A in FIG. 7, the first shroud 10 includes a first shroud main body 11 and an elastic body 12. The first shroud 10 is provided with an elastic body 12 at a portion (the radially outer and rear end portion of the first shroud main body 11) that abuts against the base end portion 16 of the second shroud 15 when the support frame 30 is located at the first position P1. Referring to FIGS. 5 and 7, when the support frame 30 is located at the first position P1 where the heat exchanger 7 faces the cooling fan 20, the first shroud 10 and the second shroud 15 cover the periphery of the cooling fan 20 in the radial direction so that the cooling air passes through the first surface 71 and the second surface 72.

[0020] FIG. 8 is a view seen from the rear when the heat exchanger 7, the support frame 30, and the second shroud 15 are arranged at the second position P2. Referring to FIG. 8, when the support frame 30 is located at the second position P2 where the heat exchanger 7 exposes the opening 82 to the outside of the vehicle body frame 2, the fan rotation shaft 21, the plurality of blades 22, and the first shroud 10 are uncovered. Therefore, it is possible to access the internal space on the side opposite to the opening 82 with respect to the cooling fan 20 through the gap between the opening 82 and the plurality of blades 22.

[0021] FIG. 7 shows the region R24 that can be occupied by the movable range 24 of the cooling fan 20 when the support frame 30 is rotated around the hinge rotation axis Axh. As can be seen from the fact that in FIG. 7 the region R24 does not contact the left base end portion 16 and the right end portion 17 of the second shroud 15, and in FIG. 6 the region R24 does not contact the end portion 17 of the second shroud 15, when the support frame 30 rotates from the second position P2 to the first position P1, the second shape is defined so that the end portion 17 of the second shroud 15 does not enter the movable range 24.

[0022] Figure 9 is a top view of the rear part of the work vehicle 1 when the upper cover 8 is removed. In Figure 9, the illustration of the engine 6 is omitted. As shown in Figure 9, the hinge rotation axis line Axh is provided on the side opposite to the cover rotation axis line Axc with respect to the opening 82. That is, the bonnet cover 9 and the support frame 30 are configured to open to opposite sides respectively. For this reason, a double-leaf door is formed by the bonnet cover 9 and the support frame 30, and the second surface 72 can be covered by the bonnet cover 9. Referring to Figures 2, 3, and 8, when the bonnet cover 9 is rotated to the position covering the second surface 72, it has a plurality of air holes 92 in the portion facing the second surface 72. The outside air sucked in from the air holes 89 etc. of the upper cover 8 is discharged from the plurality of air holes 92 of the bonnet cover 9 after cooling the engine 6 and the heat exchanger 7.

[0023] Furthermore, as shown in Figures 5, 6, 8, and 9, the support frame 30 has rollers 32 at its lower end, and when a maintenance operator moves the support frame 30, the rollers 32 roll on the bottom wall 83 of the vehicle body frame 2, so that the maintenance operator can easily move the support frame 30. Also, during the operation of the work vehicle 1, since the support frame 30 is supported by the bottom wall 83 via the rollers 32, a large load is prevented from being applied to the hinge 93 for a long time.

[0024] Also, as shown in FIG. 9, the hinge rotation axis line Axh is located behind the rear end 81RE of the support wall 81. As a result, the heat exchanger 7, the support frame 30, and the second shroud 15 can be rotated by 90 degrees or more around the hinge rotation axis line Axh. That is, the posture of the support frame 30 when located at the second position P2 is a posture obtained by rotating by 90 degrees or more around the hinge rotation axis line Axh from the posture of the support frame 30 when located at the first position P1. In FIG. 9, the heat exchanger 7, the support frame 30, and the second shroud 15 at the first position P1 are shown by solid lines, the support frame 30 and the second shroud 15 at the second position P2 are shown by two-dot chain lines, and the heat exchanger 7 at the second position P2 is shown by a one-dot chain line. The illustrated second position P2 indicates a position obtained by rotating 105 degrees from the first position P1. <Effects of the First Embodiment>

[0025] In the work vehicle 1 according to the first embodiment, when the support frame 30 is located at the second position P2 where the heat exchanger 7 exposes the opening 82 to the outside of the vehicle body frame 2, the fan rotation shaft 21 and the plurality of blades 22 are exposed. For this reason, when the member provided with the heat exchanger 7 is opened, access to the engine room becomes easy by using the gap between the opening 82 and the plurality of blades 22. Further, by providing the first shroud 10 in a region where the end portion 17 of the second shroud 15 is notched so that the second shroud 15 does not contact the plurality of blades 22, the amount of cooling air passing through the heat exchanger 7 can be increased, and the cooling efficiency can be improved. <Second Embodiment>

[0026] In the first embodiment, gaps 18 and 19 are provided between the first shroud 10 and the second shroud 15. However, the gaps 18 and 19 may not be provided by changing the shapes of the first shroud 10 and the second shroud 15. The first shroud and the second shroud having such a configuration are referred to as the first shroud 10a and the second shroud 15a, respectively, and a work vehicle including the first shroud 10a and the second shroud 15a is referred to as a work vehicle 1a. FIG. 10 is a front view showing the cooling fan 20, the first shroud 10a, the second shroud 15a, and the heat exchanger 7 according to the present embodiment. FIG. 11 is a front view showing the cooling fan 20, the first shroud 10a, the second shroud 15a, and the heat exchanger 7. FIG. 11 is a top view showing the cooling fan 20, the first shroud 10a, the second shroud 15a, and the heat exchanger 7. FIG. 12 is a left side view showing the cooling fan 20, the first shroud 10a, the second shroud 15a, and the heat exchanger 7. In FIGS. 10 to 12, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the second embodiment, only the structures of the first shroud 10a and the second shroud 15a are different. Note that the structures of the first shroud 10a and the second shroud 15a other than those shown below are the same as the structures of the first shroud 10 and the second shroud 15 in the first embodiment.

[0027] As shown in FIGS. 11 and 12, the first shroud body 11a of the first shroud 10a and the end portion 17a of the second shroud 15a have a structure in which they are in oblique contact. At the two end portions E5 and E6 of the first shroud body 11a, the thickness in the thickness direction Dt of the end portion 17a of the second shroud 15a is substantially equal to the thickness in the thickness direction Dt of the end portion 17 of the second shroud 15 in the first embodiment. The thickness in the thickness direction Dt of the end portion 17a of the second shroud 15a becomes zero near the end points E1 and E2 in the first embodiment. Therefore, it is desirable that the central angle θ1 of the first shape in the present embodiment is 180 degrees or more. It is desirable that the inclination is gentle so that the elastic body 12 can absorb the displacement due to the play of the hinge 93. In the first embodiment, the thickness in the thickness direction Dt of the first shroud body 11 is substantially equal to the thickness in the thickness direction Dt of the end portion 17 of the second shroud 15. However, in the second embodiment, the maximum thickness in the thickness direction Dt of the first shroud body 11a is larger than the maximum thickness in the thickness direction Dt of the end portion 17a of the second shroud 15a. <Effect of the Second Embodiment>

[0028] In the work vehicle 1a according to the second embodiment, since the first shroud body 11a of the first shroud 10a and the end portion 17a of the second shroud 15a have a structure in which they are in oblique contact, it is not necessary to provide gaps 18 and 19 such as those between the first shroud 10 and the second shroud 15. Therefore, in addition to the effects of the work vehicle 1 according to the first embodiment, the work vehicle 1a according to the second embodiment can further increase the air volume of the cooling air passing through the heat exchanger 7 and can further improve the cooling efficiency.

[0029] In the present application, "comprise" and its derivatives are non-limiting terms for explaining the existence of components and do not exclude the existence of other components not described. This also applies to "have", "include" and their derivatives.

[0030] The terms "~member", "~part", "~element", "~body", and "~structure" can have multiple meanings, such as a single part or a plurality of parts.

[0031] Ordinal numbers such as "first" and "second" are merely terms for identifying the configuration and do not have other meanings (such as a specific order, etc.). For example, the existence of a "second element" is not implicitly meant just because there is a "first element", nor is the existence of a "first element" implicitly meant just because there is a "second element".

[0032] Words such as "substantially", "about", and "approximately" indicating a degree may, unless otherwise specifically described in the embodiments, mean a reasonable amount of deviation such that the final result does not change significantly. All numerical values described in this application may be interpreted as including words such as "substantially", "about", and "approximately".

[0033] In this application, the phrase "at least one of A and B" should be interpreted to include only A, only B, and both A and B.

[0034] Considering the above disclosure, it is obvious that various changes and modifications to the present invention are possible. Therefore, the present invention may be implemented in a manner different from the specific disclosure of this application without departing from the gist of the present invention.

Claims

1. A vehicle frame having a support wall and an opening with the support wall as a part of the outer periphery, A hinge provided on the support wall, A support frame supported by the hinge so as to be rotatable about a hinge axis of rotation, A fan rotating shaft extending along a fan axis of rotation that passes through the opening and is in a twisted position with respect to the frame axis of rotation, and a plurality of blades provided around the fan rotating shaft in a radial direction with respect to the fan axis of rotation, the plurality of blades being configured to rotate around the fan axis of rotation to generate cooling air, a cooling fan provided on the vehicle frame, A first shroud connected to the vehicle frame between the plurality of blades and the support wall, covering a part of the outer side in the radial direction of the movable range of the plurality of blades, and having a first shape that is substantially circular arc-shaped when viewed in the axial direction along the fan axis of rotation, the first shroud extending in the axial direction, A heat exchanger having a first surface and a second surface opposite to the first surface in the thickness direction, the heat exchanger being supported by the support frame so that the second surface is exposed from the support frame, A second shroud including a base end portion covering the outer periphery of the first surface of the heat exchanger and a tip end portion having a second shape that is substantially circular arc-shaped and extending in the thickness direction, Comprising, When the support frame is in a first position where the heat exchanger faces the cooling fan, the first shroud abuts against the base end portion of the second shroud, and the tip end portions of the first shroud and the second shroud cover the outer periphery in the radial direction of the movable range, When the support frame is in a second position where the heat exchanger exposes the opening to the outside of the vehicle frame, the fan rotating shaft, the plurality of blades, and the first shroud are exposed, A work vehicle.

2. The second shape is defined so that the tip end portion of the second shroud does not enter the movable range when the support frame rotates from the second position to the first position, The work vehicle according to Claim 1.

3. The radius of the second shape is substantially equal to the radius of the first shape, When the support frame is in the first position, the center of the first shape and the center of the second shape substantially coincide, The work vehicle according to Claim 1.

4. The radius of the second shape is substantially equal to the radius of the first shape, When the support frame is located at the first position, the center of the first shape and the center of the second shape substantially coincide. The work vehicle according to claim 2.

5. The work vehicle according to claim 4, wherein the central angle of the second shape is 180 degrees or more, and the central angle of the first shape is 180 degrees or less.

6. The work vehicle according to claim 5, wherein the distance between the two end points of the substantially arc-shaped second shape is larger than the diameter of the movable range as viewed in the axial direction.

7. The work vehicle according to claim 6, wherein the distance between the two end points of the substantially arc-shaped first shape is smaller than the diameter of the movable range.

8. The first shroud is provided with an elastic body at a portion that abuts against the base end portion of the second shroud when the support frame is located at the first position. The work vehicle according to any one of claims 1 to 7.

9. The work vehicle according to any one of claims 1 to 7, further comprising a cover that can cover the second surface and is swingable around a cover rotation axis.

10. The work vehicle according to claim 9, wherein the cover rotation axis is provided on the side opposite to the hinge rotation axis with respect to the opening.

11. The cover has a plurality of air holes at a portion facing the second surface when rotated to a position covering the second surface. The work vehicle according to claim 9.

12. The cover is a bonnet cover. The work vehicle according to claim 9.

13. When the support frame is located at the second position, it is possible to access the internal space on the side opposite to the opening with respect to the cooling fan through the gap between two adjacent blades among the plurality of blades. The work vehicle according to any one of claims 1 to 7.

14. The work vehicle according to any one of claims 1 to 7, wherein the posture of the support frame when located at the second position is a posture obtained by rotating 90 degrees or more around the hinge rotation axis from the posture of the support frame when located at the first position.

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