JP2007308030A - Air conditioning structure for work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve visibility performance to a range forward and upward of a car body without deteriorating stability of the car body by devising layout of an air conditioning unit. <P>SOLUTION: In the air conditioning structure for a work vehicle, the air conditioning unit 36 is disposed on a roof part 32 of a cabin 11. The air conditioning unit 36 is disposed at a rear part of the roof part 32, and a drain hose 79 connected to a drain port 76 of the air conditioning unit is extended from the rear part of the roof part 32 to be disposed between a rear window 23 and a side window 22 jointed with a rear pillar 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioning structure of a work vehicle in which an air conditioning unit is provided in a roof portion of a cabin.

As an air conditioning structure for a work vehicle as described above, there is one in which an air conditioning unit is provided in the front half of a roof portion (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-1537 (paragraph number 0016, FIGS. 1 to 3 and FIG. 6)

  In the above configuration, the field of view of the front upper side is limited by the air conditioning unit, which makes it difficult to visually recognize the raised bucket position when, for example, a loader work connected to the front loader, and the workability is improved. descend.

  It is conceivable to increase the overall height of the cabin in order to widen the field of view of the front upper part, but in this case, the height position of the air conditioning unit is also increased and the center of gravity position of the vehicle body is increased. Will be reduced.

  An object of the present invention is to improve visibility of the front and upper sides without degrading the stability of the vehicle body by devising the arrangement of the air conditioning units.

  In order to achieve the above object, according to a first aspect of the present invention, in the air conditioning structure of a work vehicle in which an air conditioning unit is provided in a roof portion of a cabin, the air conditioning unit is disposed at a rear portion of the roof portion. And a drain hose connected to a drain outlet of the air conditioning unit is pulled out from the rear portion of the roof portion to the outside of the vehicle and passed between a rear window and a side window joined to the rear pillar.

  According to this configuration, although the air conditioning unit is disposed in the roof portion of the cabin, it is possible to avoid the view of the front and upper sides being restricted by the air conditioning unit without increasing the overall height of the cabin.

  As a result, for example, at the time of loader work connected to the front loader, it is easy to visually recognize the raised bucket position.

  The drainage of the air conditioning unit is guided to the outer surface of the rear pillar via the drain hose drawn out from the rear portion of the roof portion, and is quickly discharged out of the vehicle along the outer surface of the rear pillar.

  Then, the drain hose can be made inconspicuous by passing between the side window and the rear window, and deterioration in appearance due to the adoption of the external piping structure can be suppressed.

  Therefore, it is possible to improve the visibility of the front upper direction without deteriorating the stability of the vehicle body, so that it is possible to improve the workability in loader work and the like, and the air conditioning unit arranged at the rear without impairing the appearance The external piping structure suitable for the can be adopted, and efficient drainage can be performed.

  In the invention according to claim 2 of the present invention, in the invention according to claim 1, a drain hose provided with the drainage port on each of the front, rear, left and right sides of the air conditioning unit and connected to the drainage port on the rear side is provided. A drain hose that passes between the rear window and the side window and is connected to a front drain port passes through the inside of the rear pillar.

  According to this configuration, the drainage in the air conditioning unit can be guided from the drainage port corresponding to the inclination of the vehicle body to the inside or outside surface of the rear pillar via the corresponding drain hose, and along the inside or outside surface of the rear pillar. It can be quickly discharged out of the vehicle.

  Therefore, efficient drainage corresponding to the inclination of the vehicle body can be performed.

  FIG. 1 shows the entire side surface of a tractor, which is an example of a work vehicle. This tractor has a power transmission from an engine 2 mounted on a front frame 1 in an anti-vibration manner and is installed in a transmission case 3 that also serves as a frame. It is configured as a four-wheel drive type that transmits to a pair of left and right front wheels 4 and rear wheels 5 through a traveling transmission system including a transmission (not shown).

  As shown in FIGS. 1 and 2, a pair of left and right lift arms 6, which are driven to swing up and down by the operation of a hydraulic lifting cylinder (not shown) housed in the upper portion, are disposed at the rear of the transmission case 3. And a power take-out shaft 7 that allows the engine power to be taken out to the outside.

  The power take-off shaft 7 is a work in which the power from the engine 2 is composed of a work transmission (not shown), a work clutch (not shown), etc., which are housed in a transmission case 3 separate from the traveling transmission system. It is transmitted through the transmission system.

  Although not shown, the left and right lift arms 6 are connected to a link mechanism that is connected to the rear portion of the transmission case 3 so as to be movable up and down, and the power take-out shaft 7 is connected to a rotary mechanism connected to the link mechanism. An input shaft provided in a working device such as a tillage device is connected via a transmission shaft or the like.

  As shown in FIGS. 1 and 2, a boarding operation unit 10 including a steering wheel 8 and a driver seat 9 is formed in the rear half of the tractor, and a cabin 11 covering the boarding operation unit 10 is provided. .

  As shown in FIG. 3, an operation box 12 is provided on the right side of the driver's seat 9 in the boarding operation unit 10. The operation box 12 includes a position lever 13, a power take-out selection switch 14, an auto switch 15, and Operation tools A such as a working depth setting dial 16 are centrally arranged.

  The position lever 13 is for performing position control for swinging the left and right lift arms 6 up and down to a height position corresponding to the operation position.

  The power take-out selection switch 14 is for switching the drive state of the power take-out shaft 7 between a state in which the power take-out shaft 7 is driven at a speed synchronized with the travel speed and a state in which the drive is independently driven regardless of the travel speed.

  The auto switch 15 is a rolling control for maintaining a working device such as a rotary tiller connected to the rear part of the vehicle body via a link mechanism at a predetermined rolling angle, and a working device such as a rotary tiller in conjunction with the appearance of the reverse drive state. On / off control such as backup control that automatically raises to a predetermined upper limit position, and auto up control that automatically raises work equipment such as a rotary tiller to a predetermined upper limit position in conjunction with steering operation beyond the set angle. Is to do with.

  The plowing depth setting dial 16 is used to set the plowing depth position of the working device in automatic plowing depth control for maintaining a working device such as a rotary plowing device at a predetermined plowing depth position. The control box 17 is provided.

  The control box 17 includes a swinging open / close cover 18. A part covered with the cover 18 has a rolling angle setting dial (not shown) for setting the rolling angle of the working device in the rolling control, and the lift arm 6. A work operating tool A such as an upper limit setting dial (not shown) for setting the upper limit position is provided.

  As shown in FIGS. 1 to 10, the cabin 11 includes a cabin frame 19, a windshield 20 made of transparent curved glass, a pair of left and right door panels 21 made of transparent flat glass, and a transparent curved glass. And a pair of left and right side windows 22 of an outward opening type, and an outward opening type rear window 23 of a transparent curved glass.

  The cabin frame 19 includes a pair of left and right front pillars 24 made of deformed pipes, a pair of left and right quarter pillars 25, a pair of left and right rear pillars 26 made of square pipes, a front cross member 27 having a U-shaped cross section, and a U-shaped cross section. A pair of left and right side members 28 and a rear cross member 29 having a U-shaped cross section are welded to each other, and the front cross member 27, the left and right side members 28, and the rear cross member 29 are The roof portion 32 is formed by attaching the inner roof 30 and the outer roof 31.

  The left and right door panels 21 are connected to corresponding quarter pillars 25 via a pair of upper and lower hinges 33 so as to be openable and swayable.

  The left and right side windows 22 are connected to corresponding rear pillars 26 via a pair of upper and lower hinges 34 so as to be openable and swingable.

  The rear window 23 is connected to the rear cross member 29 through a pair of left and right hinges 35 so as to be capable of opening and closing.

The left and right rear pillars 26 are set so that the distance between them is narrower than the distance between the left and right front pillars 24 and the distance between the left and right quarter pillars 25.

  The rear cross member 29 is arranged and set at a height position lowered by a predetermined distance from the upper ends of the left and right rear pillars 26 in order to secure an arrangement space for the air conditioning unit 36 between the rear roof member 31 and an air conditioner at the upper part thereof. Three support stays 37 for supporting the unit 36 are provided.

  The inner roof 30 is joined to the lower surface of the front cross member 27, the left and right side members 28, and the rear cross member 29 at the periphery thereof, and a space for arranging an air conditioning duct between the periphery of the inner roof 30 and the outer roof 31. In order to make the living space as wide as possible while securing the center, the central portion is formed in a shape that bulges toward the outer roof 31.

  The outer roof 31 is supported by the upper surfaces of the front cross member 27 and the left and right side members 28 at the periphery thereof, and has an outside air introduction path 38 at the front and rear intermediate portions thereof, and the rear end portion thereof is more than the rear window 23. It extends rearward and functions as an upper cover that covers the upper part of the air conditioning unit 36.

  A lower cover 39 that covers the rear lower portion of the air conditioning unit 36 is connected to the outer roof 31 and the support stay 37, and the storage space 40 of the air conditioning unit 36 is formed by the rear end portion of the inner roof 30, the rear portion of the outer roof 31, and the lower cover 39. Is formed.

  As shown in FIGS. 1, 2, and 4 to 6, a pair of left and right inside air supply ports 41 that allow supply of cabin inside air to the air conditioning unit 36 are formed in the center of the rear portion of the inner roof 30.

  In the center of the rear part of the outer roof 31, a pair of left and right outside air supply ports 42 that allow the supply of outside air to the air conditioning unit 36 are formed facing the inside air supply port 41 of the inner roof 30.

  A pair of left and right ridges 43 that prevent rainwater from entering the cabin when the left and right side windows 22 are opened are formed at the rear of the outer roof 31.

  The left and right saddles 43 are formed in a hollow shape communicating with the outside air introduction path 38, and the outside air introduction port 44 is formed only on the bottom wall of the left side saddle 43, and an air filter 45 is provided.

  In this way, the outside air inlet 44 is formed only in the left ridge 43 and the air filter 45 is provided, so that when the air filter 45 is cleaned or replaced in the field, the left side of the vehicle body is adjacent to the ridge. If the vehicle body is stopped in such a state, the air filter 45 can be cleaned or replaced on the eaves that can easily reach the eaves 43 immediately after getting off the eaves from the left entrance and exit.

  As shown in FIGS. 6, 10, and 11, the outside air supply port 42 is opened between the inside air supply port 41 and the outside air supply port 42 to allow the supply of the outside air to the air conditioning unit 36, and the inside air supply The outside air mixing state in which the opening area of the opening 41 is reduced to suppress the supply of the cabin inside air from the inside air supply port 41, and the outside air supply port 42 is closed to prevent the outside air from being supplied to the air conditioning unit 36 and the inside air supply port A vertically swinging shutter 46 configured to be switched to an inside air circulation state in which 41 is largely opened is provided.

  The shutter 46 is an electric type that swings up and down about a left and right support shaft 48 by the operation of an electric motor 47, and a linkage shaft 49 provided at the free end thereof has a front and rear support pin 50 as a support point. It is operatively linked to the operating arm 53 of the electric motor 47 via the swinging crank arm 51 and the linking wire 52, and is urged to return to the inside air circulation state by a spring (not shown).

  As shown in FIGS. 4 to 6, 8, and 9, the air conditioning unit 36 includes a casing 56 in which an intake portion 54 is opened at an upper right portion and a pair of left and right pipe-shaped blowout portions 55 are formed at a front portion. The sirocco fan 57, the evaporator 58, the heater 59, and the like are arranged in the interior, and are supported by the respective support stays 37 so that the rear end portion thereof is located larger than the rear window 23 of the cabin 11, The entirety is located behind the driver seat 9.

  Thus, by arranging the air conditioning unit 36, it is possible to secure a large living space while reducing the overall height of the cabin 11 as much as possible compared to the case where the air conditioning unit 36 is arranged at the front end portion of the roof portion 32. In addition, since it is possible to equip a large air-conditioning unit 36 having a high capacity and the field of view to the front and upper side is widened, for example, it is raised during loader work connected to a front loader (not shown). This makes it easier to visually recognize the bucket position and improves workability.

  The sirocco fan 57 is arranged on the right side of the evaporator 58, and the unadjusted air taken in from the intake portion 54 is passed through an air supply path 61 formed between the evaporator 58 and the rear wall 60 of the casing 56 facing the evaporator 58. To the evaporator 58 and the heater 59.

  The rear wall 60 of the casing 56 has a multistage shape in which the left end side away from the sirocco fan 57 is closer to the evaporator 58 so as to function as a guide wall that guides unadjusted air from the sirocco fan 57 substantially uniformly throughout the evaporator 58. Is formed.

  Thus, by forming the rear wall 60 of the casing 56 in a multistage shape, a relatively large space 62 is formed between the outer surface of the left end portion of the rear wall 60 and the rear wall surface of the roof portion 32. It will be.

  Therefore, by effectively utilizing this space, the rear wall 60 of the casing 56 is equipped with an electric motor 47 for operating the shutter, thereby forming a dedicated space for housing the electric motor 47. It is possible to avoid complication of the part shape and enlargement of the roof part 32.

  Further, since the sirocco fan 57 is disposed on the right side of the evaporator 58, the sirocco fan 57 is positioned at the right end opposite to the outside air introduction port 44 formed at the left end of the outer roof 31, thereby In the mixed state, the outside air introduced from the outside air introduction port 44 is supplied to the evaporator 58 and the heater 59 through the outside air introduction path 38 and the air supply path 61 while being preheated at the internal temperature of the cabin 11. Therefore, compared with the case where the sirocco fan 57 is disposed in the vicinity of the outside air introduction port 44, the air conditioning efficiency can be improved.

  As shown in FIGS. 4 to 8, 12, and 13, a pair of left and right air conditioning ducts that guide the adjusted air from the corresponding blowing portion 55 toward the front end portion of the cabin 11 are provided in each blowing portion 55 of the casing 56. 63 is externally fitted.

  The left and right air-conditioning ducts 63 are made of a resin molded product formed in a substantially L shape so that their front end portions are in positions close to the front cross member 27 and are substantially along the front cross member 27.

  A first air outlet 64 and a second air outlet 65 are formed in the middle part of the left and right air-conditioning ducts 63 to blow the guided regulated air toward the operator from the front side of the operator.

  At the front ends of the left and right air-conditioning ducts 63, a third air outlet 66 for blowing the guided regulated air downward from the lateral end of the upper front end of the cabin 11, and the left and right middle portions of the upper end of the cabin 11. The 4th blower outlet 67 which blows off toward the downward direction is formed.

  Each of the air outlets 64 to 67 is equipped with an air outlet grill 68 to 71 that is also used as a positioning member for the left and right air conditioning ducts 63 with respect to the inner roof 30.

  The blow-off grills 68 and 69 provided in the first blow-out port 64 and the second blow-out port 65 are adapted to supply the adjusted air from the first blow-out port 64 or the second blow-out port 65 from the front side and the upper side of the driver. The direction can be changed to a state where the air is blown out toward the side or a state where the air is blown out toward the lower body.

  The blow-out grill 70 equipped in the third blow-out port 66 blows the regulated air from the third blow-out port 66 toward the side mirrors 72 equipped in the left and right front pillars 24 or from the front upper side of the operator. It is configured so that the direction can be changed in such a manner that it is blown out toward the feet of the pilot.

  The blowout grill 71 mounted on the fourth blowout port 67 is suitable for a state in which the regulated air from the fourth blowout port 67 is blown out from the front view position or the front side of the pilot toward the driver's feet. It is configured to be changeable.

  In the left and right air-conditioning ducts 63, the first air outlet 64 is blown out from the first air outlet 64 by reducing the flow rate of the regulated air forward from the first air outlet 64 between the first air outlet 64 and the third air outlet 66. The first restricting portion 73 that secures the flow rate of the adjusted air is formed, and the flow rate of the adjusted air forward from the second air outlet 65 is reduced between the second air outlet 65 and the third air outlet 66. By doing so, the second throttle portion 74 is formed to ensure the flow rate of the regulated air blown from the second blower outlet 65.

  With this configuration, the air conditioning unit 36 is arranged at the rear part of the roof portion 32 to improve the comfortability, but the adjusted air is supplied to the driver, the viewing area of the side mirror 72 in the left and right door panels 21, or the window. It becomes possible to preferentially supply to the front view area of the shield 20 and the like, thereby improving the comfort inside the cabin 11, and the front view area of the windshield 20 and the left and right The side mirror viewing area on the door panel 21 can be cleared, and the front confirmation and the rear confirmation by the side mirror 72 can be easily performed. Therefore, the maneuverability and workability can be improved.

  In particular, the first throttle part 73 is located in front of the first outlet 64 and the second throttle part 74 is located in front of the second outlet 65, so that the first outlet 64 and the second outlet 65 are separated. The control air can be blown out rearward toward the pilot.

  As shown in FIGS. 2, 8 and 9, the evaporator 58 is formed with drainage outlets 75, 76 for discharging condensed water at the left and right ends of the front and rear of the bottom part, and among these drainage openings 75, 76, A first drain hose 77 inserted into the corresponding rear pillar 26 is connected to each front drain port 75, and each drain port 76 is connected to an outlet 78 formed on the left and right sides of the lower cover 39. A second drain hose 79 drawn out of the vehicle is connected.

  The left and right second drain hoses 79 are drawn out from the corresponding outlets 78 and then extended between the side windows 22 and the rear windows 23 joined to the corresponding rear pillars 26 to the lower side of the vehicle body.

  That is, by providing drainage ports 75 and 76 at the front left and right ends of the bottom portion of the evaporator 58, the first drain hose from the drainage ports 75 and 76 corresponding to the inclination of the vehicle body 77 or the second drain hose 79 can be guided to the inside or the outer surface of the left and right rear pillars 26, and can be quickly discharged from the lower ends of the left and right rear pillars 26 along the inner surfaces of the left and right rear fenders 80 to the outside of the vehicle. Can do.

  Further, the left and right second drain hoses 79 can be made inconspicuous by passing between the side window 22 and the rear window 23, and deterioration of appearance due to the adoption of the external piping structure can be suppressed.

  As shown in FIG. 8, the left and right outlets 78 are formed in a forward and downward direction so that the drawn second drain hose 79 faces the front cabin 11. The risk of entering the interior from the outlet 78 is avoided.

  A sealing material 81 is interposed between the outer roof 31 and the lower cover 39. Further, the rear cross member 29 is then formed with a step at the upper edge, and a sealing material 82 is interposed between the rear cross member 29 and the lower cover 39 using this step.

  By interposing the sealing materials 81 and 82 in this way, airtightness and waterproofness of the air conditioning unit storage space 40 formed by the rear end portion of the inner roof 30, the rear portion of the outer roof 31, and the lower cover 39 are ensured. Can do.

  As shown in FIGS. 1, 2, and 5, the outer roof 31 is formed such that the lateral width of the rear end portion is wider than that of the lower cover 39, so that the lower cover 39 at the rear end portion of the outer roof 31 is formed. Spaces are formed on both the left and right sides.

  Therefore, this tractor is equipped with a pair of left and right winkers 83 for rearward use and a pair of left and right work lamps 84 for rearward illumination, making effective use of the space.

  The left and right winkers 83 are attached to the lower surface of the extending portion extending from the lower cover 39 to the left and right at the rear end portion of the outer roof 31, and the left and right work lights 84 are positioned directly below the corresponding winker 83. These are attached to the support stays 37 for the air conditioning units located on the left and right.

  That is, the winker 83 and the work light 84 are respectively provided at the left and right sides of the lower cover 39 at the rear end portion of the outer roof 31, so that they are more rearward than the case where they are attached to the left and right rear pillars 26. This can improve the visibility from the rear of the left and right winkers 83, and can increase the rear illumination range by the left and right work lights 84, so that it can be used during night work. It is possible to improve the workability.

  Incidentally, as shown in FIG. 1, the pair of front left and right winkers 85 are attached to the lower side of the corresponding left and right front pillars 24, and the pair of left and right work lamps 86 for front irradiation are attached to the front cross member 27. It has been.

  As shown in FIG. 3, the right quarter pillar 25 is provided with a first switch 87 for turning on and off the left and right work lamps 86 for front irradiation at a position on the front side of the vehicle body at the lower part thereof. A second switch 88 for turning on and off the left and right work lamps 84 for rear irradiation is disposed at a position on the rear side of the vehicle body in the lower part.

  Further, an air conditioner unit on / off switch 89, a temperature setting unit 90, an air volume setting unit 91, and an air supply state for switching between an outside air mixed state and an inside air circulation state are provided at a position in front of the quarter pillar 25 in the operation box 12. An air conditioning operation panel 93 provided with a changeover switch 92 as an air conditioning operation tool B is provided.

  That is, in the right side portion of the driver's seat 9, the operation tool A such as the position lever 13, the operation lamp switches 87 and 88, and the air conditioning unit on / off switch 89 and the like are operated for air conditioning. Since the tools B are centrally deployed, they can be easily operated and confirmed as compared to the case where they are diffusely deployed, and as a result, workability can be improved.

  Further, compared to the case where the operation panel 93 provided with each air-conditioning operation tool B is provided on the roof portion 32 together with the air-conditioning unit 36, a large living space can be secured, so that the comfortability can be improved. And compared with the case where it arrange | positions to the front-end part of the roof part 32, the improvement of the visibility with respect to the front upper direction can be aimed at.

  Furthermore, compared with the case where the operation panel 93 for air conditioning is provided at the rear portion of the quarter pillar 25 in the operation box 12, the visibility from the rear side of the side window 22 can be improved, and the rear portion of the vehicle body can be improved. Since it becomes easy to visually recognize the working state by a coupled rotary tiller or the like, it is possible to improve workability during a tilling work or the like.

  The operation box 12 is disposed on the upper portion of the right rear fender 80 and is formed in an upward bulging shape having an inwardly upward inclined surface 12A, and on the inclined surface 12A, a power take-out selection switch 14, an auto switch 15, Along with the working depth setting dial 16 and rolling angle setting dial provided in the control box 17, an on / off switch 89, a temperature setting device 90, an air flow setting device 91, and an air supply state provided in the operation panel 93 for air conditioning. The change-over switch 92 is provided so as not to overlap each other in the left-right direction view by effectively using the height difference in the operation box 12.

  In this manner, the operation tool B for air conditioning such as the on / off switch 89, as well as the operation tool A for operation such as the power take-off selection switch 14, are provided on the inclined surface 12A facing inward and upward in the operation box 12 having the upward bulge shape. , The operation tool A and B can be operated without increasing the length of the operation box 12 in the left-right direction, in other words, the space on the right side of the driver's seat 9 in the cabin. It can arrange | position in the position which does not interfere in visual recognition mutually.

  Further, since the inclined surface 12A faces inward and upward toward the head of the operator sitting on the driver's seat 9, the operation state of the operation tools A and B provided on the inclined surface 12A is further visually confirmed. It becomes easy.

  In other words, the air-conditioning operation tool B can be rationally disposed along with the work operation tool A at the right side portion of the driver's seat 9, so that the cabin 11 is not increased in size and can be comfortably accommodated. While securing the space, it is possible to effectively improve the operability of the air-conditioning operation tool A and the work operation tool B, and simplify the operation confirmation thereof.

  As shown in FIGS. 4 to 6 and FIG. 8, the left and right air conditioning ducts 63 are externally fitted from the front side to the corresponding blowing portions 55 of the casing 56, and are integrally formed at the front end portion thereof. Can be fixedly held in a predetermined position at a predetermined position by bolt connection to a single connector 95 provided on each of the left and right side members 28.

[Another embodiment]
The work vehicle may be a combine, a backhoe, a transport vehicle, or the like.

Overall side view of tractor Overall rear view of tractor The perspective view which shows arrangement | positioning of the operation tool in a driver seat right side location Partial cutaway plan view of cabin showing air conditioning structure Cross-sectional plan view of cabin showing air conditioning structure Cross-sectional plan view of the second half of the cabin showing the air-conditioning structure Longitudinal side view of cabin upper half showing air conditioning structure Longitudinal side view of upper half of cabin showing air conditioning structure Cross-sectional bottom view of the second half of the cabin showing the air conditioning structure Longitudinal side view of essential parts showing shutter configuration Rear view of the main part showing the configuration of the shutter Air perspective duct perspective view Longitudinal cross-sectional view of the main part showing the configuration of the regulated air outlet

Explanation of symbols

11 Cabin 22 Side window 23 Rear window 26 Rear pillar 32 Roof part 36 Air conditioning unit 75 Drain port (front side)
76 Drainage port (rear side)
77 Drain hose 79 Drain hose

Claims (2)

An air conditioning structure of a work vehicle in which an air conditioning unit is arranged on the roof of the cabin,
The air conditioning unit is arranged at the rear part of the roof part,
An air conditioning structure for a work vehicle in which a drain hose connected to a drain outlet of the air conditioning unit is pulled out from the rear of the roof portion and passed between a rear window and a side window joined to a rear pillar.   A drain hose connected to the front drain outlet is provided between the rear window and the side window, with a drain hose provided on the front and rear, left and right of the air conditioning unit, respectively. The air conditioning structure for a work vehicle according to claim 1, wherein the air conditioning structure passes through the interior of the rear pillar.

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