Support Structure for Heat Exchanger for Work Vehicle and Work Vehicle

Abstract

To facilitate access to an engine room.SOLUTION: A shroud of a support structure of a heat exchanger includes a base end covering an outer periphery of a first surface of the heat exchanger and a terminal having a substantially circular shape when viewed from a thickness direction. A support frame supports the heat exchanger and the shroud to expose the terminal and a second surface of the heat exchanger. A vehicle body frame has an opening having a support wall as a part of an outer circumference. A cooling fan includes a fan rotating shaft extending along a fan rotation axis passing through the opening and a plurality of blades provided around the fan rotating shaft, and is configured to generate cooling air. When the heat exchanger is in a first position facing the cooling fan, the terminal of the shroud radially surrounds the cooling fan such that the cooling air passes through the first and second surfaces. When the support frame is positioned at a second position where the heat exchanger exposes the opening to an outside of the vehicle body frame, the fan rotating shaft and the plurality of blades are exposed.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a support structure for a heat exchanger for a work vehicle and 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.

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 fixed around the radiator fan. Therefore, even when the member provided with the radiator is opened, it is necessary to remove the shroud for maintenance of the engine room.

[0005] The problem of the technology disclosed in the present application is to provide a support structure for a heat exchanger for a work vehicle and a work vehicle, which facilitates access to the engine room when a member provided with a radiator is opened.

Means for Solving the Problems

[0006] A support structure for a heat exchanger for a work vehicle according to a first aspect of the present disclosure comprises a heat exchanger, a shroud, a support frame, and a cooling fan. The heat exchanger has a first surface and a second surface opposite to the first surface in the thickness direction. The shroud includes a base portion that covers the outer circumference of the first surface of the heat exchanger and an end portion that has a substantially circular shape when viewed in the thickness direction, and has a cylindrical shape extending in the thickness direction from the base portion to the end portion. The support frame supports the heat exchanger and the shroud such that the end portion and the second surface are exposed. The vehicle frame comprises a support wall and has an opening that makes the support wall part of its outer circumference. A hinge is connected to the support wall and the support frame and is configured to swing the support frame about a hinge rotation axis substantially parallel to the wall surface of the support wall. The cooling fan comprises a fan rotating shaft extending along the fan rotation axis passing through the opening, and a plurality of blades arranged around the fan rotating shaft radially with respect to the fan rotation axis, and is configured to generate cooling air by rotating the plurality of blades around the fan rotation axis. When the heat exchanger is in a first position facing the cooling fan, the end of the shroud covers the cooling fan radially so that the cooling air passes through the first and second surfaces. When the support frame is in a second position where the opening of the heat exchanger is exposed to the outside of the vehicle frame, the fan rotating shaft and the plurality of blades are exposed. The hinge rotation axis and the fan rotation axis are skew lines. The hinge is configured such that, when the support frame is in the second position, the hinge rotation axis does not overlap with the support wall when viewed from the width direction perpendicular to the hinge rotation axis and the fan rotation axis. The work vehicle according to the second aspect of this disclosure is equipped with the support structure according to the first aspect. [Effects of the Invention]

[0007] The technology disclosed herein provides, for example, a support structure for a heat exchanger for a work vehicle and a work vehicle, in which, when a member on which a radiator is provided is opened, access to the engine compartment is facilitated. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is an overall side view of the work vehicle. [Figure 2] Figure 2 is a partial rear view of the work vehicle. [Figure 3] Figure 3 is a partial rear view of the work vehicle with the hood cover removed. [Figure 4] Figure 4 shows the engine as viewed from the cooling fan, shroud, and heat exchanger. [Figure 5] Figure 5 is a perspective view showing the support structure of the heat exchanger according to the first embodiment. [Figure 6] Figure 6 is a top view of the rear of the work vehicle with the top cover removed. [Figure 7] Figure 7 is a rearward perspective view of the heat exchanger, support frame, and shroud when they are positioned in the second location. [Figure 8] Figure 8 is a cross-sectional view near the notch, drawn by a plane parallel to the width direction and passing through the fan's rotation axis. [Figure 9] Figure 9 is an enlarged perspective view of the area around the shroud when the support frame is in the second position. [Figure 10] Figure 10 shows the support structure of the heat exchanger according to the second embodiment. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the attached drawings. Similar reference numerals indicate corresponding or identical components in each figure. <First Embodiment>

[0010] Referring to Figure 1, the work vehicle 1, for example, a small track loader, is equipped with a heat exchanger support structure 100 according to the first embodiment. The work vehicle 1 comprises a main frame 2, a running gear 3, a work device 4, and a cabin 5. The main frame 2 supports the running gear 3, the work device 4, and the cabin 5. In the illustrated embodiment, the running gear 3 is a crawler-type running gear. However, the running gear 3 is not limited to a crawler-type running gear. The running gear 3 may be, for example, a front-wheel / rear-wheel running gear, or a running gear having front wheels and rear crawlers. The work device 4 is equipped with an implement (bucket) 41 at the distal end of the work device 4. The proximal end of the work device 4 is attached to the rear of the main frame 2. The work device 4 comprises 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 main 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 main frame 2 and the boom 45, and acts to raise and lower the implement (bucket) 41 by operating the lift link 44 and the boom 45. At least one implement cylinder 49 is configured to tilt the implement (bucket) 41. The cabin 5 is mounted to the front of the main frame 2. The working vehicle 1 includes a front door 51 located at the front of the cabin 5, and a driver's seat 52 and operating devices (not shown) located inside the cabin 5.

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

[0012] The work vehicle 1 further comprises an engine 6, a heat exchanger 7, a shroud 10, and a cooling fan 20 located at the rear of the main frame 2. The engine 6 is configured to provide driving force to the traveler 3 and the work equipment 4. The heat exchanger 7 includes a radiator for cooling the coolant of the engine 6. Preferably, the heat exchanger 7 also includes an oil cooler for cooling the hydraulic fluid used in the hydraulic system of the work vehicle 1 (e.g., the 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 shroud 10 is configured to cover the outer circumference of the cooling fan 20 to efficiently deliver the cooling air to the heat exchanger 7. The engine 6, heat exchanger 7, shroud 10, and cooling fan 20 are located between a pair of arms 42 in the left-right direction of the work vehicle 1. The engine 6, heat exchanger 7, shroud 10, and cooling fan 20 are located between the boom cylinders 48 in the left-right direction of the work vehicle 1.

[0013] The work vehicle 1 further comprises a body frame 8 and a bonnet cover 9. The body frame 8 includes a room cover that covers the front and surrounding parts of the engine 6 and cooling fan 20. The bonnet cover 9 is located at the rear end of the main frame 2 and covers the opening 82. Figure 2 is a partial rear view of the area around the bonnet cover 9 of the work vehicle 1. Referring to Figure 2, the bonnet cover 9 is pivotable around the cover rotation axis Axc. In Figure 2, the hinge 91 for rotating the bonnet cover 9 is located on the underside of the bonnet cover 9 and is therefore shown as a dotted line. The body frame 8 includes an upper cover 89 above and in front of the bonnet cover. The upper cover 89 is openable and closable.

[0014] Figure 3 is a partial rear view of the work vehicle 1 with the bonnet cover 9 removed. Referring to Figures 1 and 3, the vehicle frame 8 has a support wall 81 and an opening 82 that makes the support wall 81 part of the outer circumference. Figure 4 is a view of the engine 6, the cooling fan 20, the shroud 10, and the heat exchanger 7. Figure 5 is a perspective view showing the support structure 100 of the heat exchanger 7 according to the first embodiment. In Figures 3 and 4, the pair of arms 42 are not shown. Referring to Figures 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 Figures 4 and 5, the shroud 10 includes a base end 11 that covers the outer circumference of the first surface 71 of the heat exchanger 7 and an end 12 that has a substantially circular shape when viewed in the thickness direction Dt. The shroud 10 has a cylindrical shape that extends in the thickness direction Dt from the base end 11 to the end 12.

[0015] 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 shroud 10 so as to expose the end portion 12 and the second surface 72. As shown in FIGS. 3 and 5, 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 connected to the support wall 81 and the support frame 30. The hinge 93 is configured to swing the support frame 30 around 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] FIG. 6 is a top view of the rear part of the work vehicle 1 when the upper cover 89 is removed. In FIG. 6, the illustration of the engine 6 is omitted. As shown in FIG. 6, the hinge rotation axis Axh is provided on the opposite side of the cover rotation axis Axc with respect to the opening 82. That is, the bonnet cover 9 and the support frame 30 are configured to open on opposite sides. Therefore, an ogival 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 FIGS. 2 and 3, when the bonnet cover 9 is rotated to a position covering the second surface 72, the bonnet cover 9 has a plurality of air holes 92 in a portion facing the second surface 72. The outside air sucked in from air holes (not shown) of the upper cover 89 and the like is discharged from the air holes 92 of the upper cover 89 after cooling the heat exchanger 7 and the engine 6.

[0017] Furthermore, as shown in FIGS. 5 and 6, the support frame 30 has rollers 32 at its lower end, and when the maintenance worker moves the support frame 30, the rollers 32 roll on the bottom wall 83 of the vehicle body frame 8, so that the maintenance worker can easily move the support frame 30. Also, during the operation of the work vehicle 1, the support frame 30 will be supported by the bottom wall 83 via the rollers 32, so that a large load will not be applied to the hinge 93 for a long time.

[0018] Referring to FIGS. 3 to 5, the cooling fan 20 includes a fan rotation shaft 21 and a plurality of blades 22. The fan rotation shaft 21 extends along the 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. 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.

[0019] Furthermore, referring to Figure 6, when the support frame 30 is positioned at a first position P1 where the heat exchanger 7 faces the cooling fan 20, the end portion 12 of the shroud 10 radially covers the periphery of the cooling fan 20 so that the cooling air passes through the first surface 71 and the second surface 72. As shown in Figure 6 and Figure 7 described later, when the support frame 30 is positioned at a second position P2 where the opening 82 of the heat exchanger 7 is exposed to the outside of the vehicle frame 8, the fan rotating shaft 21 and the multiple blades 22 are exposed (uncovered). As shown in the enlarged view of area A in Figure 6, the support frame 30 includes a connecting member 31 that is connected to the hinge rotating shaft 94. This connecting member 31 has a notch 31C to prevent contact with the hinge 93 and the support wall 81 when rotating. Furthermore, the hinge 93 is configured such that the hinge rotation axis Axh does not overlap with the support wall 81 when viewed from the width direction Dw, which is perpendicular to the hinge rotation axis Axh and the fan rotation axis Axf. Specifically, as shown in the enlarged view of area A in Figure 6, the hinge rotation axis Axh is located behind the rear end 81RE of the support wall 81. In this embodiment, the hinge rotation axis Axh, the fan rotation axis Axf, and the width direction Dw are generally perpendicular to each other.

[0020] This allows the heat exchanger 7, support frame 30, and shroud 10 to be rotated by more than 90 degrees around the hinge rotation axis Axh. In other words, the orientation of the support frame 30 when it is in the second position P2 is the orientation obtained by rotating it by more than 90 degrees around the hinge rotation axis Axh from the orientation of the support frame 30 when it is in the first position P1. In Figure 6, the heat exchanger 7, support frame 30, and shroud 10 in the first position P1 are shown with solid lines, the support frame 30 and shroud 10 in the second position P2 are shown with dashed lines, and the support frame 30 in the second position P2 is shown with a single dashed line. The second position P2 shown represents the position obtained by rotating 90 degrees from the first position P1. Therefore, the heat exchanger 7, support frame 30, and shroud 10 can be rotated further around the hinge rotation axis Axh than the second position P2 shown.

[0021] Figure 7 is a rear perspective view of the heat exchanger 7, support frame 30, and shroud 10 when they are positioned in the second position P2. In Figure 7, the upper cover 89 is open forward. As shown in Figure 7, when the support frame 30 is in the second position P2, the fan rotating shaft 21 and the multiple blades 22 are exposed. Therefore, the cooling fan 20 can access the internal space on the opposite side of the opening 82 through the gap between the opening 82 and the multiple blades 22.

[0022] Referring to Figures 6 and 7, when the support frame 30 is located at the first position P1, a portion of the shroud 10 (base end 11) that is closer to the support wall 81 than the fan rotation shaft 21 in the width direction Dw has a notch 13 that is recessed toward the first surface 71. Figure 8 is a cross-sectional view of the vicinity of the notch 13 by a plane parallel to the width direction Dw and passing through the fan rotation axis Axf. In Figure 8, region 22R schematically shows the region that the multiple blades 22 pass through when they rotate. The shroud 10 includes an extension region 14 on the side opposite to the portion with the notch 13 relative to the fan rotation axis Axf, and covers the radially outer side of the cooling fan 20 relative to the fan rotation axis Axf. Because the shroud 10 includes the extension region 14, the tip of the shroud 10 passes through the path R0 in the figure and comes into contact with the multiple blades 22. In this embodiment, the notch 13 is configured such that the extension region 14 is removed, so that when the support frame 30 rotates, the tip of the notch 13 passes through the path R1, and the shroud 10 does not come into contact with the multiple vanes 22.

[0023] Figure 9 is an enlarged perspective view of the area around the shroud 10 when the support frame 30 is positioned at the second position P2. Referring to Figures 5 and 9, the heat exchanger 7 further includes a first connection port PT1 for connecting to a pipe TU1 for carrying a liquid, which is a refrigerant or hydraulic oil. The heat exchanger 7 further includes a second connection port PT2 for connecting to a pipe TU2 for carrying a liquid, which is a refrigerant or hydraulic oil. The heat exchanger 7 includes a first swivel joint SJ1 located closer to the hinge rotation axis Axh than the first connection port PT1, and a second swivel joint SJ2 located closer to the hinge rotation axis Axh than the second connection port PT2. The heat exchanger 7 includes a pipe TU1 for flowing the liquid, connecting a first connection port PT1 and a first swivel joint SJ1; a pipe TU2 for flowing the liquid, connecting a second connection port PT2 and a second swivel joint SJ2; a pipe TU3 connecting the first swivel joint SJ1 to a third connection port CT1, which is the source or destination of the liquid; and a pipe TU4 connecting the second swivel joint SJ2 to a fourth connection port CT2, which is the source or destination of the liquid. The third connection port CT1 is, for example, a connection port to a hydraulic oil tank. The fourth connection port CT2 is, for example, a connection port to an engine 6 configured to rotate a cooling fan 20. Note that pipes TU1 and TU2 may be referred to as the first pipe. Pipes TU3 and TU4 may be referred to as the second pipe.

[0024] Figure 5 shows the support structure 100 of the heat exchanger 7 when the support frame 30 is positioned at the first position P1 of the heat exchanger 7. Referring to Figure 5, the distance DJ1 between the first swivel joint SJ1 and the hinge rotation axis Axh in an additional radial direction Dr perpendicular to the hinge rotation axis Axh (in Figure 5, the additional radial direction Dr is the same as the width direction Dw) is shorter than the distance DT1 between the first connection port PT1 and the hinge rotation axis Axh in the additional radial direction Dr. The distance DJ2 between the second swivel joint SJ2 and the hinge rotation axis Axh in the additional radial direction Dr is shorter than the distance DT2 between the second connection port PT2 and the hinge rotation axis Axh in the additional radial direction Dr. If the first connection port PT1 and the third connection port CT1 are connected by a single pipe without providing the first swivel joint SJ1, the pipe needs to be bent by about 90 degrees to prevent it from interfering with the cooling fan 20. If the second connection port PT2 and the fourth connection port CT2 are connected by a single pipe without the second swivel joint SJ2, the pipe needs to be bent by more than 90 degrees to prevent it from interfering with the cooling fan 20. By using the first swivel joint SJ1 and the second swivel joint SJ2, the flexibility of pipe routing can be improved. In particular, the need to bend the pipe significantly for routing is suppressed. <Effects of the First Embodiment>

[0025] In the heat exchanger support structure 100 according to the first embodiment, when the support frame 30 is positioned at a second position P2 in which the heat exchanger 7 has an opening 82 exposed to the outside of the vehicle body frame 8, the fan rotating shaft 21 and the multiple blades 22 are exposed. Therefore, when the member on which the heat exchanger 7 is installed is opened, access to the engine compartment is made easier by utilizing the gap between the opening 82 and the multiple blades 22. In addition, the notch 13 is configured such that the extension region 14 is removed so that the shroud 10 does not come into contact with the multiple blades 22 when the support frame 30 rotates. <Second Embodiment>

[0026] Figure 10 shows the support structure 110 of the heat exchanger according to the second embodiment. In Figure 10, the same reference numerals are used for components identical to those in the first embodiment, and detailed explanations are omitted. In the support structure 110 of the heat exchanger according to the second embodiment, the hinge rotation axis Axh, determined by the hinge rotation shaft 94, is configured to slide to Axh_out shown in Figure 8. As a result, even if the shroud 10a according to this embodiment includes an extended region 14 (even without the notch 13), the tip of the notch 13 passes through the path R2 when the support frame 30 rotates, and the shroud 10a is configured not to come into contact with the multiple blades 22.

[0027] Therefore, Figure 10 shows that the support structure 110 has a hinge 93a which includes a shaft support plate 95a having a slot 96 through which the hinge rotation shaft 94 passes. The slot 96 extends in a guide direction Dg which intersects the hinge rotation axis Axh. More specifically, the guide direction Dg is perpendicular to the hinge rotation axis Axh. The shaft support plate 95a has a support surface 97 which extends in the guide direction Dg. The support frame 30a further has a connecting member 31a which connects the hinge rotation shaft 94 and the support frame 30a. The connecting member 31a has a contact surface 33 which slidably contacts the support surface 97.

[0028] As shown in Figure 8, when the hinge rotation shaft 94 is located at one end of the slot 96 (Axh in the figure), the support frame 30a can come into contact with the multiple blades 22 when the support frame 30a is swung around the hinge rotation axis Axh. When the hinge rotation shaft 94 is located at the opposite end of the slot 96 (Axh_out in the figure), the support frame 30a cannot come into contact with the multiple blades 22 when the support frame 30a is swung around the hinge rotation axis (Axh_out in the figure). Therefore, when the support frame 30a is moved to the second position P2, the hinge rotation axis Axh is located at the position of Axh_out in the figure. Therefore, the hinge 93a is configured such that, when the support frame 30a is in the second position P2, the hinge rotation axis (Axh_out in the figure) does not overlap with the support wall 81 when viewed from the width direction Dw. Furthermore, when the support frame 30a is in the first position P1, the hinge rotation shaft 94 of the hinge 93a is positioned such that the hinge rotation axis Axh overlaps with Axh in Figure 8. <Effects of the second embodiment>

[0029] The heat exchanger support structure 110 according to the second embodiment has a hinge 93a equipped with a shaft support plate 95a having a slot 96 through which a hinge rotation shaft 94 passes. The slot 96 extends in a guide direction Dg intersecting the hinge rotation axis Axh. When the hinge rotation shaft 94 is positioned at one end of the slot 96 (Axh in the figure), the support frame 30a can come into contact with the multiple blades 22 when the support frame 30a is swung around the hinge rotation axis Axh. When the hinge rotation shaft 94 is positioned at the other end opposite to one end of the slot 96 (Axh_out in the figure), the support frame 30a cannot come into contact with the multiple blades 22 when the support frame 30a is swung around the hinge rotation axis (Axh_out in the figure). For this reason, the shroud 10a does not need to have a notch 13. As a result, when the support frame 30a is in the first position P1, the shroud 10a can completely cover the area around the multiple blades 22, thereby improving the cooling efficiency of the heat exchanger 7. In addition, the hinge rotation shaft 94 can be slid to the Axh_out position, allowing the support frame 30a to rotate significantly, which facilitates access to the engine compartment through the gap between the opening 82 and the multiple blades 22.

[0030] In this application, “equipped with” and its derivatives are non-restrictive terms that describe the existence of a component and do not exclude the existence of other components not described. This also applies to “having,” “including,” and their derivatives.

[0031] The terms "~member," "~part," "~element," "~body," and "~structure" can have multiple meanings, such as a single part or multiple parts.

[0032] Ordinal numbers such as "1st" and "2nd" are simply terms used to identify components and do not carry any other meaning (such as a specific order). For example, the existence of a "1st element" does not implicitly mean the existence of a "2nd element," nor does the existence of a "2nd element" implicitly mean the existence of a "1st element."

[0033] Unless otherwise specifically stated in the embodiments, terms such as "substantially," "about," and "approximately" can mean a reasonable deviation that does not significantly alter the final result. All numerical values ​​described in this application may be interpreted as including terms such as "substantially," "about," and "approximately."

[0034] In this application, the phrase "at least one of A and B" should be interpreted to include A only, B only, and both A and B.

[0035] Based on the above disclosure, it is clear 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 disclosures of this application, without departing from the spirit of the invention.

Claims

1. a heat exchanger having a first surface and a second surface opposite the first surface in a thickness direction; a shroud having a cylindrical shape extending in the thickness direction from the base end to the end end, the shroud including a base end covering an outer periphery of the first surface of the heat exchanger and a terminal end having a substantially circular shape when viewed in the thickness direction; a support frame supporting the heat exchanger and the shroud so as to expose the end portion and the second surface; a vehicle body frame including a support wall and an opening having the support wall as a part of its outer periphery; a hinge connected to the support wall and the support frame and configured to swing the support frame about a hinge rotation axis that is substantially parallel to a wall surface of the support wall; a cooling fan including a fan rotation shaft extending along a fan rotation axis passing through the opening, and a plurality of blades provided around the fan rotation shaft in a radial direction relative to the fan rotation axis, the cooling fan being configured to rotate the plurality of blades around the fan rotation axis to generate cooling air; Equipped with when the support frame is located at a first position where the heat exchanger faces the cooling fan, the end portion of the shroud covers the periphery of the cooling fan in the radial direction so that the cooling air passes through the first surface and the second surface; When the support frame is located at a second position where the heat exchanger exposes the opening to the outside of the vehicle body frame, the fan rotation shaft and the plurality of blades are exposed, The hinge rotation axis and the fan rotation axis are lines in a twisted position, the hinge is configured to dispose the hinge rotation axis so as not to overlap the support wall when viewed from a width direction perpendicular to the hinge rotation axis and the fan rotation axis when the support frame is located at the second position. A support structure for a heat exchanger for a work vehicle.

2. the heat exchanger further includes a connection port for connecting to a pipe for flowing a liquid such as a refrigerant or a hydraulic oil; a swivel joint provided at a position closer to the hinge rotation axis than the connection port; a first pipe for allowing the liquid to flow, the first pipe connecting the connection port and the swivel joint; a second pipe connecting the swivel joint to a connection destination that is a supply source or a supply destination of the liquid; Further provided with The support structure of claim 1 .

3. a distance between the swivel joint and the hinge rotation axis in an additional radial direction perpendicular to the hinge rotation axis is shorter than a distance between the connection port and the hinge rotation axis in the additional radial direction; The support structure of claim 2 .

4. The support structure according to claim 1 , further comprising a cover that can cover the second surface and can swing around a cover rotation axis.

5. The support structure according to claim 4 , wherein the cover rotation axis is located on the opposite side of the opening from the hinge rotation axis.

6. the cover has a plurality of air holes in a portion that faces the second surface when the cover is rotated to a position that covers the second surface; A support structure according to claim 4 or 5.

7. The cover is a bonnet cover. A support structure according to any one of claims 4 to 6.

8. 8. The support structure according to claim 1, wherein a portion of the shroud that is closer to the support wall in the width direction than the fan rotating shaft when the support frame is located at the first position has a notch that is recessed toward the first surface.

9. The hinge is a hinge rotation shaft having the hinge rotation axis, extending along the hinge rotation axis, and swingable integrally with the support frame; a shaft support plate fixed to the support wall and having a slot through which the hinge rotation shaft passes; Equipped with The slot extends in a guide direction that intersects with the hinge rotation axis. A support structure according to any one of claims 1 to 7.

10. The guide direction is a direction perpendicular to the hinge rotation axis. The support structure of claim 9.

11. the shaft support plate has a support surface extending in the guide direction; the support frame further includes a connecting member that connects the hinge rotation shaft and the support frame; The connecting member has an abutment surface that slidably abuts against the support surface. A support structure according to claim 9 or 10.

12. when the hinge rotation shaft is positioned at one end of the slot, the support frame can come into contact with the plurality of blades when the support frame is swung around the hinge rotation axis; When the hinge rotation shaft is positioned at the other end opposite to the one end of the slot, the support frame does not come into contact with the plurality of blades when the support frame is swung around the hinge rotation axis. A support structure according to any one of claims 9 to 11.

13. When the support frame is located at the second position, the cooling fan has access to an internal space on the opposite side of the opening through a gap between two adjacent blades among the plurality of blades. A support structure according to any one of claims 1 to 12.

14. 14. The support structure according to claim 1, wherein the posture of the support frame when positioned at the second position is a posture obtained by rotating the support frame by 90 degrees or more around the hinge rotation axis from the posture of the support frame when positioned at the first position.

15. A work vehicle comprising a support structure according to any one of claims 1 to 14.

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