Work vehicles

Abstract

To provide work vehicles that can improve convenience. [Solution] The roof unit 30 has an internal space partitioned by an inner roof 31 and an outer roof; an air conditioning unit 140 housed in the internal space and providing air conditioning for the cabin 10; a filter device 111 capable of removing substances to be removed from the introduced outside air; a filter device 161 capable of removing substances to be removed from the introduced outside air and different from the first filter device; and a switching mechanism 170 capable of switching between a first introduction state in which air purified by the filter device 111 is introduced into the air conditioning unit 140; a second introduction state in which air purified by the filter device 161 is introduced into the air conditioning unit 140; and an internal air circulation state in which air from inside the cabin 10 is introduced into the air conditioning unit 140.

Description

Technical Field

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

Background Art

[0002] Conventionally, the technology of work vehicles has been well-known. For example, it is as described in Patent Document 1.

[0003] The tractor described in Patent Document 1 includes a roof, a filter, a fan, etc. The roof is formed in a hollow shape. The filter and the fan are provided on the roof. When the fan is driven, the air outside the tractor is purified by the filter and then sent into the cabin.

[0004] In the tractor described in Patent Document 1, only one path for sending air into the cabin through the filter is described. However, since the dirt condition of the air outside the tractor varies depending on the work content and traveling location of the tractor, etc., there may be cases where it is desired to selectively use a plurality of filters with different purification performances according to the dirt condition of the air. Also, there may be cases where it is desired to circulate the air inside the cabin of the tractor. For this reason, there is a need for a technology that can switch the supply path of the air sent into the cabin to perform the above-described selective use of the filter and the circulation of the air inside the cabin (which can improve convenience).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] One aspect of the present disclosure has been made in view of the above situation, and the problem to be solved is to provide a work vehicle capable of improving convenience.

Means for Solving the Problems

[0007] The problem that one aspect of this disclosure aims to solve is as described above, and the means for solving this problem will now be explained.

[0008] In one embodiment of the present disclosure, the roof unit comprises an interior space partitioned by an inner roof and an outer roof; an air conditioning unit housed in the interior space for air conditioning the cabin; a first filter device capable of removing substances to be removed from the introduced outside air; a second filter device different from the first filter device, capable of removing substances to be removed from the introduced outside air; and a switching mechanism capable of switching between a first introduction state in which air purified by the first filter device is introduced to the air conditioning unit; a second introduction state in which air purified by the second filter device is introduced to the air conditioning unit; and an internal air circulation state in which air from inside the cabin is introduced to the air conditioning unit. According to one aspect of this disclosure, the switching mechanism allows switching between three states (first introduction state, second introduction state, and internal air circulation state), thereby improving convenience.

[0009] In one embodiment of the present disclosure, the present invention further comprises an introduction member having a first opening into which air purified by the first filter device is introduced, a second opening into which air purified by the second filter device is introduced, and a third opening into which air from inside the cabin is introduced, and a duct section that guides the air introduced into the introduction member to the air conditioning unit. According to one aspect of this disclosure, air can be introduced into the air conditioning unit using a common route (introduction member and duct section), thereby simplifying the air circulation path.

[0010] In one embodiment of the present disclosure, the second and third openings are formed downstream of the first opening in the airflow direction of the first filter device, and the switching mechanism comprises: a first switching unit for switching whether or not the air purified by the first filter device can be introduced into the first opening; a second switching unit for switching whether or not the air purified by the second filter device can be introduced into the second opening; a third switching unit for switching whether or not air can flow between the first opening, the second opening, and the third opening in the airflow direction; and a drive unit for driving the first switching unit, the second switching unit, and the third switching unit. According to one aspect of this disclosure, the first introduction state, the second introduction state, and the internal air circulation state can be switched by controlling the drive unit.

[0011] In one embodiment of this disclosure, the first switching unit and the third switching unit are provided on the introduction member. According to one aspect of this disclosure, a first switching section and a third switching section can be provided using a common component (introduction component).

[0012] In one embodiment of this disclosure, the present invention further comprises a detection unit for detecting the switching state of the first switching unit. According to one aspect of this disclosure, it is possible to determine whether or not air can be introduced into the first opening.

[0013] In one embodiment of the present disclosure, the invention further comprises a blower connected to the second filter device and supplying air purified by the second filter device, and a duct connected to the blower and the introduction member and guiding the air supplied from the blower to the introduction member, wherein the second switching unit is configured to open and close the connection portion between the blower and the duct. According to one aspect of this disclosure, it is possible to switch whether or not air can be introduced into the second opening at a location relatively close to the second filter device (the end of the duct on the side of the second filter device).

[0014] In one aspect of the present disclosure, an inner air introduction part is formed in the inner roof to introduce the air in the cabin into the internal space, and the inner air introduction part, the second filter device, and the introduction member are arranged in parallel along the left-right direction in plan view. According to one aspect of the present disclosure, the spaces on the front side and the rear side of the inner air introduction part, the second filter device, etc. can be effectively utilized.

[0015] According to one aspect of the present disclosure, convenience can be improved.

Brief Description of the Drawings

[0016] [Figure 1] Left side view showing the overall configuration of a tractor according to one aspect of the present disclosure. [Figure 2] Front perspective view showing the cabin. [Figure 3] Similarly, front exploded perspective view. [Figure 4] Plan view showing the cabin frame. [Figure 5] Left side view showing the periphery of the left rear pillar. [Figure 6] Cross-sectional view taken along line A1 - A1 in FIG. 5. [Figure 7] Right side view showing the periphery of the right rear pillar. [Figure 8] Front exploded perspective view showing the roof. [Figure 9] Plan view showing the inner roof. [Figure 10] Cross-sectional view of the roof taken along line A2 shown in FIG. 9. [Figure 11] Plan view showing the state where the filter device is detached. [Figure 12] Plan view schematically showing the air flow path in the inner roof. [Figure 13] Plan cross-sectional view schematically showing the case. [Figure 14] Plan cross-sectional view schematically showing the introduction member. [Figure 15] (a) Cross-sectional view taken along line A3 - A3 in FIG. 14. (b) Cross-sectional view taken along line A4 - A4 in FIG. 14. [Figure 16] (a) A schematic diagram showing the airflow path of outside air introduced from the left rear pillar. (b) A schematic diagram showing the airflow path of outside air introduced from the right rear pillar. [Figure 17] A schematic diagram showing the airflow path introduced from inside the cabin. [Figure 18] A plan view showing the first sealing member and the second sealing member. [Figure 19] (a) Plan view showing the mounting structure of the second sealing member. (b) Plan view showing the groove. [Figure 20] A5-A5 cross-section in Figure 19(a). [Figure 21] (a) Plan view showing the fixing structure of the air conditioner. (b) Exploded perspective view of the same. [Figure 22] A6-A6 cross-section in Figure 21(a). [Figure 23] (a) Cross-sectional view of A7-A7 in Figure 21(a). (b) Cross-sectional view of A8-A8 in Figure 23(a). [Figure 24] A plan view showing the heater hose and cooler hose. [Figure 25] (a) Plan view showing the heater hose (b) Plan view showing the cooler hose. [Figure 26] A9-A9 cross-section in Figure 24. [Figure 27] Side view showing the right front pillar and heater hose. [Figure 28] A plan view showing the first sealing member positioned inside the second sealing member. [Modes for carrying out the invention]

[0017] In the following explanation, the directions indicated by arrows U, D, F, B, L, and R in the diagram will be defined as upward, downward, forward, backward, left, and right, respectively.

[0018] First, the overall configuration of a tractor 1, which is a work vehicle according to one aspect of this disclosure, will be described. As shown in Figure 1, the tractor 1 mainly comprises a machine frame 2, engine 3, bonnet 4, transmission case 5, front wheels 6, rear wheels 7, fenders 8, lifting device 9, cabin 10, etc.

[0019] The machine frame 2 is a frame-shaped member formed by appropriately combining multiple plate materials. The machine frame 2 is positioned at the front of the tractor 1 with its longitudinal direction facing the front-to-back direction. The engine 3 is fixed to the rear of the machine frame 2. The engine 3 is covered by a bonnet 4. A transmission case 5 is provided at the rear of the engine 3. The transmission case 5 houses a transmission (not shown) that changes the speed of the power from the engine 3.

[0020] The front of the aircraft frame 2 is supported by a pair of front wheels 6 via a front axle mechanism (not shown). The rear of the transmission case 5 is supported by a pair of rear wheels 7 via a rear axle mechanism (not shown). The pair of rear wheels 7 are covered from above by fenders 8.

[0021] A lifting device 9 is provided at the rear of the transmission case 5. Various work devices (for example, a tiller, etc.) can be attached to the lifting device 9. The lifting device 9 can raise and lower the attached work devices using actuators such as hydraulic cylinders.

[0022] The power from engine 3 is shifted by a transmission (not shown) housed in the transmission case 5, and then transmitted to the front axle mechanism, and subsequently to the front wheels 6 via the front axle mechanism. The power shifted by the transmission is also transmitted to the rear wheels 7 via the rear axle mechanism. In this way, the power from engine 3 rotates the front wheels 6 and the rear wheels 7, allowing the tractor 1 to move. The power from engine 3 can also drive the work equipment mounted on the lifting device 9.

[0023] A cabin 10 is located behind the engine 3. The cabin 10 is mounted on the vehicle body (transmission case 5, etc.). Inside the cabin 10, an interior space is formed where an occupant sits. A seat 11 for the occupant to sit in is arranged in the interior space. A steering wheel 12 for adjusting the steering angle of the front wheels 6 is located at the front of the cabin 10.

[0024] The bonnet 4 is formed in a roughly box shape with openings at the bottom and rear. The engine compartment is formed by the aircraft frame 2 and the bonnet 4, etc. The engine compartment houses a compressor 13 for compressing the refrigerant, a condenser 14 for cooling the refrigerant compressed by the compressor 13, and the engine 3, etc.

[0025] Next, the configuration of the cabin 10 will be described. As shown in Figures 2 and 3, the cabin 10 mainly comprises a cabin frame 20 and a roof unit 30, etc.

[0026] The cabin frame 20 constitutes the framework of the cabin 10. The cabin frame 20 is formed by combining longitudinal frame materials and plate-like members. Specifically, as shown in Figure 3, the cabin frame 20 mainly comprises a left front pillar 21L, a right front pillar 21R, a left rear pillar 22L, a right rear pillar 22R, a front beam 23, a rear beam 24, a left side beam 25L, a right side beam 25R, a rear lower frame 26, a left side lower frame 27L, a right side lower frame 27R, and frame reinforcing members 28, etc.

[0027] The left front pillar 21L, the right front pillar 21R, the left rear pillar 22L, and the right rear pillar 22R are positioned with their longitudinal direction approximately oriented vertically. The left front pillar 21L and the right front pillar 21R are positioned at the front of the cabin 10, spaced apart from each other to the left and right. The left front pillar 21L and the right front pillar 21R support the front side of the roof unit 30, which will be described later. The left rear pillar 22L and the right rear pillar 22R are positioned at the rear of the cabin 10, spaced apart from each other to the left and right. The left rear pillar 22L and the right rear pillar 22R support the rear side of the roof unit 30.

[0028] As described above, the cabin frame 20 of this embodiment is a four-pillar cabin frame 20 without a center pillar between the front pillars 21L and 21R and the rear pillars 22L and 22R. The configuration of the cabin frame 20 is not limited to this embodiment and can be changed as desired. For example, the cabin frame 20 may be a six-pillar cabin frame 20 in which a center pillar is positioned between the front pillars 21L and 21R and the rear pillars 22L and 22R.

[0029] The front beam 23, rear beam 24, left side beam 25L, and right side beam 25R shown in Figures 3 and 4 constitute the upper part of the cabin frame 20. The front beam 23, etc., are arranged with their longitudinal direction oriented approximately horizontally. The front beam 23 is positioned to connect the upper ends of the left front pillar 21L and the right front pillar 21R. The rear beam 24 is positioned to connect the upper ends of the left rear pillar 22L and the right rear pillar 22R. The left side beam 25L is positioned to connect the upper ends of the left front pillar 21L and the left rear pillar 22L. The right side beam 25R is positioned to connect the upper ends of the right front pillar 21R and the right rear pillar 22R. In this way, the front beam 23, rear beam 24, left side beam 25L, and right side beam 25R are formed in a rectangular frame shape in plan view.

[0030] The rear lower frame 26 shown in Figure 3 is positioned to connect the lower ends of the left rear pillar 22L and the right rear pillar 22R. The left side lower frame 27L is positioned to extend forward and downward from the left rear pillar 22L. The right side lower frame 27R is positioned to extend forward and downward from the right rear pillar 22R. The left side lower frame 27L and the right side lower frame 27R are formed in a curved shape in side view that bulges forward and upward, and the fender 8 is fixed to the lower part of the left side lower frame 27L and the right side lower frame 27R, respectively.

[0031] The frame reinforcing members 28 shown in Figures 3 and 4 reinforce the upper rear of the cabin frame 20. The frame reinforcing members 28 are provided in pairs (left and right) at the corners between the rear end of the right side beam 25R and the right end of the rear beam 24, and at the corners between the rear end of the left side beam 25L and the left end of the rear beam 24. The frame reinforcing members 28 are formed in a roughly triangular shape in plan view along the aforementioned corners.

[0032] As shown in Figure 4, a sealing member 33 is positioned on the upper surface of the cabin frame 20. The sealing member 33 seals the space between the cabin frame 20 and the roof unit 30. The sealing member 33 is made of an elastically deformable material (e.g., rubber). The sealing member 33 is placed on the front beam 23, rear beam 24, left side beam 25L, right side beam 25R, and frame reinforcement member 28, and is arranged in an annular shape along the cabin frame 20.

[0033] The roof unit 30 shown in Figure 3 constitutes the ceiling portion of the cabin 10. The roof unit 30 is installed on top of the cabin frame 20 and is positioned to cover the seat 11 from above. The roof unit 30 mainly comprises an inner roof 31 and an outer roof 32.

[0034] The inner roof 31 is fixed to the top of the cabin frame 20 and forms the ceiling of the cabin 10. An air conditioning unit 140, etc., which will be described later, is placed inside the inner roof 31. The outer roof 32 is positioned above the inner roof 31 and is fixed to the top of the inner roof 31. The outer roof 32 is formed to cover the inner roof 31 from above. The outer roof 32 and the inner roof 31 form the roof unit 30 into a hollow, roughly box-like shape.

[0035] In the cabin 10 according to this embodiment, outside air can be introduced into the roof unit 30 via the left rear pillar 22L and the right rear pillar 22R. In this embodiment, air from the interior space of the cabin 10 (inside the cabin 10) can also be introduced into the roof unit 30. The air conditioning unit 140 inside the roof unit 30 conditioned the air introduced into the roof unit 30. The conditioned air from the air conditioning unit 140 is blown into the interior. The structures related to the air circulation described above will be explained in order below.

[0036] First, we will explain the structure of the left rear pillar 22L and its surrounding area (filter housing member 110, etc.) as shown in Figures 5 and 6.

[0037] The left rear pillar 22L is formed in a longitudinal shape that extends vertically. The left rear pillar 22L is also formed in a curved shape that bulges slightly outwards to the left and right. The left rear pillar 22L is formed in a hollow shape with a roughly rectangular cross-section (see Figure 6). On the side of the left rear pillar 22L facing roughly to the left, an opening 22La is formed that connects the inside and outside of the left rear pillar 22L.

[0038] The opening 22La is for drawing in outside air to be introduced into the filter device 111, which will be described later. The opening 22La is formed, for example, in a rectangular shape when viewed from the side, and at least one is formed on the left side of the left rear pillar 22L. The configuration of the opening 22La (number, shape, etc.) is not particularly limited and can be changed as appropriate. Outside air can be introduced into the left rear pillar 22L through the opening 22La. The outside air introduced into the left rear pillar 22L flows upward through the left rear pillar 22L and can flow into the roof unit 30 from the upper end of the left rear pillar 22L.

[0039] A filter housing member 110 and a filter device 111 are provided on the left rear pillar 22L. The filter housing member 110 is for housing the filter device 111. The filter housing member 110 is formed in the shape of a roughly rectangular parallelepiped, which is long vertically and hollow. The filter housing member 110 is formed to follow the left rear pillar 22L (in a curved shape that bulges slightly outward on both sides). The right side of the filter housing member 110 is open. The left side of the filter housing member 110 (inlet surface 110a) is formed in a mesh-like manner with many minute openings 110b. Note that the openings 110b are not shown in Figure 5.

[0040] The filter device 111 removes target particles (dust and dirt) contained in the outside air. The filter device 111 is formed in a roughly rectangular parallelepiped shape that is elongated vertically. The filter device 111 is also formed so that outside air can pass through from left to right. The filter device 111 allows the flow of outside air and is equipped with a filter for collecting target particles. The filter device 111 is housed in a filter housing member 110.

[0041] The filter housing member 110 is fixed to the left rear pillar 22L with the filter device 111 housed within it. At this time, the opening 22La formed on the left side of the left rear pillar 22L is covered by the filter housing member 110. In this way, the filter device 111 is positioned on the left rear side of the cabin 10 (on the left rear pillar 22L side of the roof unit 30 in a plan view) and can remove dust and dirt contained in the outside air introduced into the left rear pillar 22L.

[0042] The following describes how outside air is introduced from the left rear pillar 22L. When air is drawn in by the blower 130 located inside the roof unit 30 (described later), the outside air passes through the introduction surface 110a of the filter housing member 110, is dust-removed by the filter device 111 housed in the filter housing member 110, and is then introduced into the left rear pillar 22L through the opening 22La of the left rear pillar 22L. This outside air circulates upward inside the left rear pillar 22L and is guided to the roof unit 30.

[0043] Next, I will explain the structure of the right rear pillar 22R.

[0044] The right rear pillar 22R shown in Figure 7 is formed symmetrically with the left rear pillar 22L. An opening 22Ra is formed in the right rear pillar 22R. The opening 22Ra is for drawing in outside air to be introduced into the filter device 161, which will be described later.

[0045] Unlike the left rear pillar 22L, the right rear pillar 22R does not have a filter housing member 110 and a filter device 111 (see Figure 6). Dust and other particles contained in the outside air introduced into the right rear pillar 22R are removed inside the roof unit 30 (filter unit 160, described later).

[0046] Next, we will explain the structure of the roof unit 30.

[0047] As described above, the roof unit 30 is formed in a hollow shape by the inner roof 31 and the outer roof 32. As shown in Figure 8, the roof unit 30 (inner roof 31) houses equipment such as the air conditioning unit 140. First, the configuration of the inner roof 31 will be described.

[0048] As shown in Figures 8 and 9, the inner roof 31 is formed in a roughly rectangular shape in plan view, having a size similar to that of the frame formed by the front beam 23, rear beam 24, etc. The cross-section of the inner roof 31 is also formed in a partially hollow shape.

[0049] Multiple recesses are formed on the upper surface of the inner roof 31. The inner roof 31 is covered by the outer roof 32. The interior space of the roof unit 30 is formed by the partitioning between the inner wall of the inner roof 31 and the inner wall of the outer roof 32. Figure 12 is a schematic representation of the shape of the recesses and other features of the inner roof 31 to illustrate the interior space of the roof unit 30. As shown in Figure 12, the interior space of the roof unit 30 includes an introduction section 120, a filter housing section 121, a connection section 122, a first guide section 123, an air conditioner housing section 124, and a second guide section 125.

[0050] The intake section 120 is the part into which outside air purified by the filter device 111 is introduced. The intake section 120 is formed at the rear of the roof unit 30. More specifically, the intake section 120 is formed behind the front-to-rear center of the roof unit 30 in the front-to-rear direction. The intake section 120 is also formed to extend from near the left end of the roof unit 30 to near the left-to-right center. A blower 130, which will be described later, is housed at the right end of the intake section 120. The left end of the intake section 120 overlaps with the left rear pillar 22L (see Figure 3) in a plan view. An outside air inlet 120a is formed at the left end of the intake section 120, penetrating the inner roof 31 vertically. The outside air inlet 120a is connected to the upper end of the left rear pillar 22L. As a result, outside air guided by the left rear pillar 22L is introduced into the intake section 120 via the outside air inlet 120a.

[0051] The filter housing 121 houses the filter device 161, which will be described later, and is also the part into which outside air is introduced to the filter device 161. The filter housing 121 is formed in the right rear part of the roof unit 30. More specifically, the filter housing 121 is formed behind the front-to-rear center of the roof unit 30 in the front-to-rear direction. Also, the filter housing 121 is formed to the right of the left-to-right center of the roof unit 30 in the left-to-right direction. The filter housing 121 overlaps with the right rear pillar 22R (see Figure 3) in a plan view. An outside air inlet 121a is formed in the filter housing 121 so as to penetrate the inner roof 31 vertically. The outside air inlet 121a is connected to the upper end of the right rear pillar 22R. As a result, outside air guided by the right rear pillar 22R is introduced into the filter housing 121 via the outside air inlet 121a.

[0052] The connection section 122 is the part that connects the introduction section 120 and the filter housing section 121 to each other. The connection section 122 is formed at the rear end of the roof unit 30. The connection section 122 is formed to extend to the left and right. The right end of the connection section 122 is connected to the filter housing section 121. The left end of the connection section 122 is connected to the left and right intermediate sections of the introduction section 120.

[0053] The first guide section 123 is formed in a cylindrical shape extending front to back in the approximate left-right center portion of the roof unit 30. The first guide section 123 is formed by the upper surface of the inner roof 31 bulging upward relative to its lower surface (see Figures 8 and 22). The first guide section 123 can guide air in the front-rear direction. The rear end of the first guide section 123 is connected to the right end of the introduction section 120. The front end of the first guide section 123 is connected to the air conditioner housing section 124, which will be described later. The first guide section 123 is formed so that its width gradually widens from rear to front.

[0054] The air conditioner housing 124 is formed at the front of the roof unit 30. More specifically, the air conditioner housing 124 is formed in front of the front-to-rear center of the roof unit 30 in the front-to-rear direction. The air conditioner housing 124 is also formed to extend from near the left end to near the right end of the roof unit 30. The front end of the first guide portion 123 is connected to the left-to-right center of the rear end of the air conditioner housing 124. An air outlet 124a and a hose insertion portion 124b are formed in the air conditioner housing 124 so as to penetrate the inner roof 31 vertically.

[0055] The air outlets 124a are formed at both the left and right ends of the air conditioner housing 124. The air outlets 124a are formed to open to the interior space of the cabin 10. As a result, the conditioned air from the air conditioner unit 140, which will be described later, is blown into the interior of the cabin 10 through the air outlets 124a.

[0056] The hose insertion section 124b is the part through which a hose (such as the heater hose 410 described later) for circulating refrigerant between the air conditioning unit 140 and other equipment is inserted. The hose insertion sections 124b are formed on both the left and right sides of the air conditioning housing section 124. The left hose insertion section 124b is formed near the left front pillar 21L (see Figure 4). For example, the left hose insertion section 124b is formed so that at least a portion of it overlaps with the left front pillar 21L in a plan view. The right hose insertion section 124b is formed near the right front pillar 21R. For example, the right hose insertion section 124b is formed so that at least a portion of it overlaps with the right front pillar 21R in a plan view.

[0057] The second guide section 125 is formed on both the left and right sides of the first guide section 123. The second guide section 125 is connected to both the left and right ends of the air conditioner housing section 124. The second guide section 125 is formed to extend rearward from the air conditioner housing section 124. An air outlet 125a is formed in the second guide section 125 so as to penetrate the inner roof 31 vertically.

[0058] Two air outlets 125a are formed on each of the left and right second guide sections 125. The air outlets 125a are formed to open to the interior space of the cabin 10. As a result, conditioned air from the air conditioning unit 140, which will be described later, is blown into the interior of the cabin 10 through the air outlets 125a.

[0059] Furthermore, the inner roof 31 has an interior air intake section 126 for introducing air from the cabin 10's interior space into the roof unit 30. The interior air intake section 126 is formed to penetrate the inner roof 31 vertically and to open to the cabin 10's interior space. In this embodiment, the interior air intake section 126 is formed in the left-right direction between the intake section 120 and the filter housing section 121. The interior air intake section 126 may be formed in a different position than in this embodiment, as long as it is possible to introduce air from the cabin 10's interior space into the roof unit 30.

[0060] As shown in Figure 3, the inner roof 31 is fixed to the cabin frame 20 from above. More specifically, the inner roof 31 is placed on the front beam 23 and rear beam 24, etc., as shown in Figure 4, and the sealing member 33 is elastically deformed by being sandwiched between the front beam 23, etc. and the inner roof 31. In this state, the inner roof 31 is fixed to the front beam 23, etc. by fasteners 34 such as bolts.

[0061] Thus, in this embodiment, instead of sandwiching the front beam 23 etc. between the inner roof 31 and the outer roof 32 from above and below, the bottom surface of the inner roof 31 (roof unit 30) is configured to rest on the front beam 23 etc. As a result, the front beam 23 etc. is positioned on the outside of the roof unit 30, which increases the available space inside the roof unit 30. Furthermore, by increasing the available space, it is possible to secure space to accommodate equipment such as the air conditioning unit 140 without increasing the size of the roof unit 30.

[0062] Furthermore, fasteners 34 for securing the inner roof 31 are attached to various members that make up the upper part of the cabin frame 20. Specifically, the fasteners 34 are attached to the front beam 23, rear beam 24, left side beam 25L, right side beam 25R, and frame reinforcement member 28, respectively.

[0063] The fasteners 34 are attached to various components of the cabin frame 20, allowing the inner roof 31 to be fixed to the cabin frame 20 in a balanced manner. Furthermore, the fasteners 34 can be easily positioned at equal intervals. This allows the inner roof 31 to be pressed evenly (elastically deformed) around the entire circumference of the sealing member 33, thereby improving the sealing performance.

[0064] Furthermore, a stay 34a is fixed to the frame reinforcing member 28 in this embodiment, and the fastener 34 is attached to the frame reinforcing member 28 via the stay 34a. Figure 4 shows an enlarged view of the cross-section of the stay 34a and the like from the horizontal direction. As shown in Figure 4, the stay 34a is fixed to the upper surface of the frame reinforcing member 28 and is positioned between the inner roof 31 and the frame reinforcing member 28. The stay 34a has an inverted U-shaped cross-section and is formed so that the fastener 34 can be attached to the inside.

[0065] By providing a stay 34a on the frame reinforcing member 28, the fastener 34 can be fixed at a relatively higher position (than the frame reinforcing member 28). Note that the fastener 34 does not necessarily need to be attached to the frame reinforcing member 28 via the stay 34a; it may be attached directly to the frame reinforcing member 28 (without other members).

[0066] Next, the components housed in the roof unit 30 will be described. As shown in Figures 9 and 12, the roof unit 30 houses a blower 130, an air conditioning unit 140, a first guide member 150, a filter unit 160, a switching mechanism 170, and a detection unit 180.

[0067] The blower 130 is a device for supplying air to the air conditioning unit 140. The blower 130 is housed at the right end of the inlet 120 (near the connection point with the first guide 123) and is positioned to the left of the interior air inlet 126. The blower 130 is connected to the rear end of the first guide 123. The blower 130 can supply the air introduced into the inlet 120 toward the first guide 123.

[0068] The air conditioning unit 140 is a device for performing air conditioning. The air conditioning unit 140 is housed in the air conditioning housing section 124 (front side of the roof unit 30). The air intake port (not shown) of the air conditioning unit 140 is connected to the front end of the first guide section 123.

[0069] The first guide member 150 guides the conditioned air (air supplied into the cabin 10) from the air conditioning unit 140. The first guide member 150 is formed in a cylindrical shape that extends front to back. A pair of first guide members 150 are provided on the left and right sides of the air conditioning unit 140. The first guide members 150 are housed in the roof unit 30 so as to extend from both the left and right ends of the air conditioning housing section 124 to the second guide section 125. The first guide members 150 are also positioned offset from the hose insertion section 124b in a plan view.

[0070] The front end of the first guide member 150 is connected to air outlets (not shown) formed on the left and right sides of the air conditioning unit 140. Thus, the first guide member 150 is positioned to extend rearward along the side of the roof unit 30 from the connection point with the air conditioning unit 140. The front part of the first guide member 150 is connected to an air outlet 124a formed in the air conditioning housing 124. The rear part of the first guide member 150 is connected to an air outlet 125a formed in the second guide member 125.

[0071] The filter unit 160 removes the target material contained in the outside air and guides it to the inlet 120. The filter unit 160 comprises a filter device 161, a mounting member 162, a blower 163, a case 164, a flow meter 165, a second guide member 166, and an inlet member 167.

[0072] The filter device 161 shown in Figures 8 and 9 removes substances to be removed from the outside air. The filter device 161 is formed in a substantially cylindrical shape. Inside the filter device 161, a filter is provided (not shown) that allows the flow of outside air and collects substances to be removed. This filter has a higher dust removal performance than the filter device 111 (see Figure 6) provided on the left rear pillar 22L. In this embodiment, the filter of the filter device 161 can remove more types of substances than the filter device 111. For example, in addition to dust and dirt (substances to be removed by the filter device 111), the filter can also remove vapors and aerosols.

[0073] The filter device 161 is housed in the filter housing 121 with its axis oriented in the front-rear direction. The bottom of the filter housing 121 (the right rear part of the inner roof 31) is formed to bulge downward in accordance with the shape of the filter device 161, as shown in Figure 10. More specifically, the bottom of the filter housing 121 is formed in a concave shape capable of accommodating approximately the lower half of the filter device 161. The filter device 161 is positioned in this bulging portion and above the right rear pillar 22R. The filter device 161 communicates with the right rear pillar 22R via the outside air inlet 121a (see Figure 12) of the filter housing 121.

[0074] As shown in Figure 9, the filter device 161 is positioned on the right side of the roof unit 30 (on the right rear pillar 22R side of both the left and right sides), and overlaps with the right rear pillar 22R in a plan view. This allows the distance from the right rear pillar 22R to the filter device 161 to be relatively short, thereby reducing the pressure loss when introducing outside air from the right rear pillar 22R to the filter device 161.

[0075] Furthermore, the front-to-back width of the filter device 161 is smaller than the front-to-back width of the filter housing 121. Therefore, as shown in Figures 9 and 12, a gap 121b is formed in the filter housing 121, allowing the filter device 161 to move along the front-to-back direction when it is housed therein.

[0076] Figure 11 shows the filter device 161 moved forward from the state shown in Figure 9. As shown in Figure 11, the filter device 161 has a projection 161a that protrudes backward. The projection 161a is formed in a cylindrical shape. The filter device 161 can discharge outside air from the tip of the projection 161a, from which dust and other particles have been removed.

[0077] The mounting member 162 shown in Figures 9 and 12 is a member to which the filter device 161 is detachably attached. The mounting member 162 is formed to be engageable with the protrusion 161a of the filter device 161. The mounting member 162 is housed in the filter housing 121.

[0078] Figure 9 shows a filter device 161 in which the protruding portion 161a is engaged with the mounting member 162 (attached to the mounting member 162). When the filter device 161 is moved forward, the engagement with the mounting member 162 is released (see Figure 11).

[0079] As described above, in this embodiment, the filter device 161 is moved in the front-rear direction, thereby attaching and detaching the filter device 161 from the mounting member 162. Furthermore, as described above, the filter housing 121 has a gap 121b that allows the filter device 161 to move along the front-rear direction (allowing movement in the front-rear direction). With this configuration, the filter device 161 can be attached and detached using the gap 121b.

[0080] The blower 163 shown in Figures 9 and 12 is a device for introducing outside air into the filter device 161. The blower 163 is connected to the filter device 161 via a mounting member 162. The blower 163 can send the outside air purified by the filter device 161 toward the left. The blower 163 is housed at the right end of the connection part 122 and is positioned on the right side of the roof unit 30 (on the right rear pillar 22R side of both the left and right sides). The filter device 161 is located in the filter housing part 121 adjacent to the right end of the connection part 122. By arranging the filter device 161 and the blower 163 adjacent to each other around the right rear pillar 22R in this way, the pressure loss when outside air flows from the opening 22Ra of the right rear pillar 22R to the blower 163 can be reduced.

[0081] Case 164 is a component for connecting the blower 163 and the second guide member 166. Case 164 is positioned between the blower 163 and the second guide member 166 in the left-right direction. As shown in Figure 13, case 164 is formed in a hollow shape. Figure 13 is a plan cross-sectional view showing case 164 and its surroundings, and the shapes of the various components are shown schematically for the sake of explanation. A flow path 164a is formed in case 164 that allows outside air to pass from left to right.

[0082] The flow meter 165 shown in Figures 9 and 13 measures the flow rate of outside air that has passed through the filter device 161. The flow meter 165 is designed to allow air to pass through in the left-right direction. The flow meter 165 is housed in the connection part 122 and is positioned on the left side of the case 164 (downstream side in the direction of outside air flow). The flow meter 165 is also connected to the case 164.

[0083] The second guide member 166 guides the outside air that has passed through the flow meter 165. The second guide member 166 is formed in a cylindrical shape with its axis oriented in the left-right direction. The second guide member 166 is housed in the connection part 122 and is positioned to the left of the flow meter 165. The right end of the second guide member 166 is connected to the filter device 161 and the blower 163 via the case 164 and the flow meter 165. The left end of the second guide member 166 is connected to the introduction member 167. The second guide member 166 can guide the outside air sent from the blower 163 to the introduction member 167.

[0084] The introduction member 167 shown in Figures 9 and 14 is a member through which air purified by the filter devices 111 and 161, and air from the interior space of the cabin 10, are introduced. The introduction member 167 is housed in the introduction section 120. The introduction member 167 is formed in a roughly box shape along the introduction section 120. The right end of the introduction member 167 is connected to the blower 130. Figure 14 is a plan cross-sectional view showing the introduction member 167 and its surroundings, and the shapes of the various members are schematically represented for the sake of explanation. The introduction member 167 is equipped with a flow path 167a, a first opening 167b, a second opening 167c, and a third opening 167d.

[0085] The airflow path 167a is the portion through which air can flow (the internal space of the introduction member 167). When the blower 130 is driven, air flows through the airflow path 167a to the right (towards the blower 130).

[0086] The first opening 167b shown in Figures 14 and 15(a) is the part into which the air purified by the filter device 111 is introduced. The first opening 167b is formed to penetrate vertically through the bottom surface of the introduction member 167. The first opening 167b is formed to be adjacent to the outside air inlet 120a on the upper side.

[0087] The second opening 167c shown in Figure 14 is the part into which the air purified by the filter device 161 is introduced. The second opening 167c is formed to penetrate the rear surface of the introduction member 167 from front to back and is connected to the second guide member 166.

[0088] The third opening 167d is the portion through which air is introduced from the internal air intake section 126 (see Figure 12). The third opening 167d is formed to penetrate vertically through the upper and lower surfaces of the intake member 167.

[0089] The second opening 167c and the third opening 167d are formed downstream of the first opening 167b in the direction of air flow from the first opening 167b. In this embodiment, the second opening 167c, etc., are formed on the blower 130 side (right side) of the first opening 167b.

[0090] The switching mechanism 170 switches the airflow path to the air conditioner unit 140. As shown in Figures 13 and 14, the switching mechanism 170 comprises a first switching section 171, a first drive section 172, a second switching section 173, a second drive section 174, a third switching section 175, and a third drive section 176.

[0091] The first switching unit 171 shown in Figures 14 and 15(a) is for switching whether or not the air purified by the filter device 111 can be introduced into the first opening 167b. The first switching unit 171 is provided on the introduction member 167. The first switching unit 171 comprises an opening / closing member 171a and a pivot shaft 171b.

[0092] The opening / closing member 171a shown in Figure 15(a) is a member that opens and closes the first opening 167b. The opening / closing member 171a is positioned inside the introduction member 167. The opening / closing member 171a is formed in a substantially L-shape when viewed from the axial direction of the pivot shaft 171b. Note that the opening / closing member 171a is not shown in Figure 14.

[0093] The pivot shaft 171b shown in Figures 14 and 15 is positioned with its axis oriented horizontally. The pivot shaft 171b is rotatably mounted by bearings (not shown). One end of the opening / closing member 171a (the upper end in Figure 15(a)) is fixed to the pivot shaft 171b. A portion of the pivot shaft 171b (the front portion in Figure 14) is positioned to protrude outside the introduction member 167.

[0094] The first drive unit 172 shown in Figure 15(b) is a drive source that drives the first switching unit 171. The first drive unit 172 comprises a motor 172a and a connecting member 172c.

[0095] Motor 172a is for rotating the pivot shaft 171b. Motor 172a is positioned outside the introduction member 167. Motor 172a has a rotating part 172b that rotates in conjunction with the driving of the motor 172a. The rotating part 172b is formed to extend from its rotation center C in a predetermined direction (down and to the left in Figure 15(b)).

[0096] The connecting member 172c is a member that connects the motor 172a and the pivot shaft 171b. The connecting member 172c is formed in a longitudinal shape. The connecting member 172c is positioned on the outside of the introduction member 167. One end of the connecting member 172c (the lower end in Figure 15(b)) is fixed to the pivot shaft 171b. An elongated hole 172d is formed in the connecting member 172c. A protruding portion that extends from the rotating part 172b (the part extending from the rotation center C) is inserted through the elongated hole 172d.

[0097] The first switching unit 171 shown in Figure 15(a) can open and close the first opening 167b by driving the motor 172a. More specifically, when the motor 172a shown in Figure 15(b) is driven, the rotating part 172b slides inside the elongated hole 172d while rotating around the rotation center C. The connecting member 172c and the pivot shaft 171b rotate in conjunction with the rotation of the rotating part 172b. The opening / closing member 171a rotates in conjunction with the rotation of the pivot shaft 171b, opening and closing the first opening 167b. In this way, the first switching unit 171 can switch between a state in which air can be introduced into the introduction member 167 through the first opening 167b (state of the opening / closing member 171a shown by a dashed line in Figure 15(a)) and a state in which air cannot be introduced (state of the opening / closing member 171a shown by a solid line in Figure 15(a)).

[0098] Furthermore, in this embodiment, the opening and closing operation of the opening / closing member 171a can be performed without rotating the rotating part 172b in both directions, as the rotating part 172b slides through the elongated hole 172d. For example, the opening and closing operation of the opening / closing member 171a can be performed by rotating the rotating part 172b only in the counterclockwise direction as shown in Figure 15(b). This makes it possible to open and close the first opening 167b using a motor 172a with a simple configuration.

[0099] The second switching unit 173 shown in Figure 13 is for switching whether or not the air purified by the filter device 161 can be introduced into the second opening 167c. The second switching unit 173 is provided in the case 164. The second switching unit 173 comprises an opening / closing member 173a and a pivot shaft 173b.

[0100] The opening / closing member 173a is a member that opens and closes the flow path 164a of the case 164 (the connection portion between the blower 163 and the second guide member 166). The opening / closing member 173a is formed in a flat plate shape and is housed in the case 164. The pivot shaft 173b is positioned with its axis oriented in the vertical direction. The pivot shaft 173b rotatably supports the opening / closing member 173a.

[0101] The second drive unit 174 is a drive source that drives the second switching unit 173. The second drive unit 174 is composed of a motor in which an output shaft (not shown) is arranged concentrically with the pivot shaft 173b. The second drive unit 174 is connected to the pivot shaft 173b and can rotate the pivot shaft 173b.

[0102] The second switching unit 173 can rotate the opening / closing member 173a around the axis of the pivot shaft 173b when driven by the second drive unit 174. This allows the second switching unit 173 to switch between a state in which the flow path 164a is open and air can be introduced into the second opening 167c (the state of the opening / closing member 173a shown by a solid line in Figure 13) and a state in which the flow path 164a is closed and air cannot be introduced into the second opening 167c (the state of the opening / closing member 173a shown by a dashed line in Figure 13).

[0103] The third switching unit 175 shown in Figure 14 is for switching whether or not air can flow between the first opening 167b, the second opening 167c and the third opening 167d in the direction of air flow from the first opening 167b. The third switching unit 175 is provided on the introduction member 167. The third switching unit 175 comprises an opening / closing member 175a and a pivot shaft 175b. The third drive unit 176 drives the third switching unit 175 (drive source). Since the third switching unit 175 and the third drive unit 176 are configured in the same way as the second switching unit 173 and the second drive unit 174, a detailed explanation of the third switching unit 175 and the third drive unit 176 is omitted.

[0104] The third switching unit 175 can rotate the opening / closing member 175a around the axis of the pivot shaft 175b when driven by the third drive unit 176. This allows the third switching unit 175 to switch between a state in which the flow path 167a is open and air can flow (the state of the opening / closing member 175a shown by a solid line in Figure 14) and a state in which the flow path 167a is closed and air cannot flow (the state of the opening / closing member 175a shown by a dashed line in Figure 14).

[0105] The configuration of the switching mechanism 170 described above is merely an example and can be modified as appropriate. For example, the first switching unit 171 may rotate the pivot shaft 171b directly by connecting the motor 172a and the pivot shaft 171b without using the connecting member 172c. Alternatively, the first switching unit 171, the second switching unit 173, and the third switching unit 175 can switch the airflow on or off by sliding them vertically or horizontally, rather than rotating the opening / closing member 171a, etc. Furthermore, the first switching unit 171, the second switching unit 173, and the third switching unit 175 may be located in different places than those in this embodiment.

[0106] The detection unit 180 shown in Figure 15(b) detects the switching state of the first switching unit 171. The detection unit 180 is located on one side (the left side in Figure 15(b)) of the connecting member 172c. The detection unit 180 is composed of, for example, a microswitch. The detection unit 180 is pressed by the connecting member 172c when the opening / closing member 171a closes the first opening 167b, and the pressure is released when the first opening 167b is open. This allows the detection unit 180 to detect the opening / closing state of the first opening 167b by the opening / closing member 171a. For example, the detection unit 180 can detect whether or not the first opening 167b is closed.

[0107] The configuration of the detection unit 180 described above is merely an example and can be modified as needed. For example, an additional detection unit 180 can be added to detect when the first opening 167b is fully open, thereby detecting both the open and closed states of the first opening 167b. Furthermore, the detection unit 180 does not necessarily have to be composed of a microswitch; the open / closed state of the first opening 167b can also be detected using other sensors.

[0108] Next, the air circulation paths within the roof unit 30 configured as described above will be explained. In this embodiment, the switching mechanism 170 switches between the air circulation path of air purified by the filter device 111, the air circulation path of air purified by the filter device 161, and the air circulation path of air from the interior space of the cabin 10.

[0109] Below, we will first refer to Figure 16(a) to explain the path through which the air purified by the filter device 111 flows.

[0110] When the air purified by the filter device 111 is to be circulated within the roof unit 30, the second switching unit 173 is switched to a state where air cannot be circulated (see the opening / closing member 173a shown by the dashed line in Figure 13). The first switching unit 171 and the third switching unit 175 are switched to a state where air can be circulated (see the opening / closing member 171a shown by the dashed line in Figure 15(a) and the opening / closing member 175a shown by the solid line in Figure 14).

[0111] In this state, the blower 130 and the air conditioning unit 140 are activated. As a result, outside air passes through the filter device 111 and is introduced into the introduction section 120 via the opening 22La (see Figure 6) in the left rear pillar 22L and the outside air inlet 120a. This outside air flows into the introduction member 167 via the first opening 167b (see Figure 15(a)), flows to the right through the flow path 167a (introduction section 120), and then flows into the first guide section 123.

[0112] The outside air that has flowed through the first guide section 123 is air-conditioned (temperature controlled, etc.) by the air conditioning unit 140. The outside air conditioned by the air conditioning unit 140 (conditioned air) flows through the first guide member 150 to the outlets 124a and 125a and is supplied to the interior of the cabin 10. This allows the interior of the cabin 10 to be air-conditioned using the air introduced into the left rear pillar 22L (air purified by the filter device 111). When the air introduced from the left rear pillar 22L is circulated into the roof unit 30, the blower 163 is stopped.

[0113] Furthermore, the first guide member 150 in this embodiment extends rearward from the air conditioning unit 140 and is connected to the air outlet 125a. The air outlet 125a is positioned closer to the seat 11 (see Figure 1) in the front-to-back direction than the front air outlet 124a. Therefore, by blowing conditioned air from the air outlet 125a, the conditioned air can be directed from a position relatively close to the face and neck of the occupant seated in the seat 11, thereby improving the occupant's comfort. For example, when the air conditioning unit 140 is operating in cooling mode, directing the conditioned air towards the occupant's neck, etc., can effectively make them feel cool.

[0114] Next, referring to Figure 16(b), the path through which the air purified by the filter device 161 flows will be explained.

[0115] When the air purified by the filter device 161 is circulated within the roof unit 30, the second switching unit 173 is switched to a state in which air can circulate (see the opening / closing member 173a shown by a solid line in Figure 13). At least one of the first switching unit 171 and the third switching unit 175 can be switched to a state in which air cannot circulate. For example, both the first switching unit 171 and the third switching unit 175 can be switched to a state in which air cannot circulate (see the opening / closing member 171a shown by a solid line in Figure 15(a) and the opening / closing member 175a shown by a dashed line in Figure 14).

[0116] In this state, the blowers 130 and 163 and the air conditioning unit 140 are activated. As a result, outside air is introduced into the filter device 161 shown in Figure 16(b) via the opening 22Ra (see Figure 7) of the right rear pillar 22R and the outside air inlet 121a of the filter housing 121. After being purified by the filter device 161, the outside air passes through the mounting member 162 and the blower 163, etc., and is introduced into the introduction member 167 (introduction section 120) via the second guide member 166. The flow rate of the outside air is measured by the flow meter 165. By measuring the flow rate of the outside air in this way, various controls can be performed using the measurement results. For example, the pressure (internal pressure) inside the cabin 10 can be controlled.

[0117] The outside air introduced into the introduction member 167 flows through the first guide section 123 and is conditioned by the air conditioning unit 140, similar to the case where purified air from the filter device 111 flows through (Figure 16(a)), and is then blown into the cabin 10 from the outlet 124a, etc. In this way, the cabin 10 can be air-conditioned using the air purified by the filter device 161.

[0118] As described above, the filter device 161 has a higher removal performance than the filter device 111, so by circulating outside air from the outside air inlet 121a of the filter housing 121, cleaner air can be supplied to the cabin 10.

[0119] The filter in filter device 161 is less permeable to outside air than the filter in filter device 111. For example, the filter in filter device 161 has a finer mesh than the filter in filter device 111. For this reason, in this embodiment, in addition to blower 130, blower 163 is also operated to ensure a sufficient supply of outside air to the air conditioning unit 140.

[0120] Next, referring to Figure 17, we will explain the airflow path from the interior space of cabin 10.

[0121] When air is to be circulated from the interior space of the cabin 10 into the roof unit 30, the second switching unit 173 can be switched to a state where air cannot circulate (see the opening / closing member 173a shown by the dashed line in Figure 13). At least one of the first switching unit 171 and the third switching unit 175 can also be switched to a state where air cannot circulate. For example, both the first switching unit 171 and the third switching unit 175 can be switched to a state where air cannot circulate (see the opening / closing member 171a shown by the solid line in Figure 15(a) and the opening / closing member 175a shown by the dashed line in Figure 14).

[0122] In this state, the blower 130 and the air conditioning unit 140 are activated. Air from the interior space of the cabin 10 is introduced into the roof unit 30 via the interior air intake section 126 shown in Figure 17. This air circulates through the gaps within the roof unit 30 and is introduced into the intake member 167 via the third opening 167d (see Figure 14) of the intake member 167.

[0123] The air introduced into the introduction member 167 flows through the first guide section 123 and is conditioned by the air conditioning unit 140, similar to the case where purified air from the filter device 111 flows through (Figure 16(a)), and is then blown into the cabin 10 from the outlet 124a, etc. This allows air to be circulated between the cabin 10 and the roof unit 30, thereby providing air conditioning for the cabin 10.

[0124] As described above, in this embodiment, it is possible to switch between a state in which air purified by filter device 111 is circulated (state shown in Figure 16(a)), a state in which air purified by filter device 161 is circulated (state shown in Figure 16(b)), and a state in which air from the interior space of cabin 10 is circulated (state shown in Figure 17). Furthermore, this state can be switched at will by the operator using an operating device (not shown) provided inside cabin 10.

[0125] For example, if the outside air is considered to be relatively polluted based on the work performed by the tractor 1 or the location where it is driven, the outside air purified by the filter device 161 can be introduced into the roof unit 30 (see Figure 16(b)). Also, if the outside air is considered to be relatively clean, the outside air purified by the filter device 111 can be introduced (see Figure 16(a)). Furthermore, if the temperature difference between the inside and outside of the cabin 10 is relatively large, the air can be circulated between the cabin 10 and the roof unit 30 to make it easier to maintain the cabin 10 at the set temperature.

[0126] Thus, in this embodiment, the airflow path in the roof unit 30 can be switched as needed. This improves convenience.

[0127] Furthermore, as shown in Figures 16 and 17, in this embodiment, the air purified by the filter device 111, the air purified by the filter device 161, and the air from the interior space of the cabin 10 are each introduced into the first guide unit 123 via the introduction member 167. This allows air to be introduced into the air conditioning unit 140 using a common path (introduction member 167 and first guide unit 123), thereby simplifying the air circulation path.

[0128] As shown in Figure 9, in this embodiment, the filter device 161, the internal air intake unit 126, the blower 130, and the intake member 167 are arranged in parallel along the left-right direction in a plan view. This allows for effective use of the space in front of and behind the filter device 161, the internal air intake unit 126, etc. For example, as in this embodiment, the space behind the internal air intake unit 126, etc., can be utilized to form a circulation path for air purified by the filter device 161 (see Figure 16(b)).

[0129] In this embodiment, when air from the filter devices 111 and 161 flows through the roof unit 30 (see Figure 16), air from the interior space of the cabin 10 is introduced into the roof unit 30 via the interior air intake 126. This makes it easier to maintain the cabin 10 at the set temperature by supplying temperature-controlled air from inside the cabin 10 to the air conditioning unit 140, even when outside air is introduced.

[0130] Next, we will explain the configuration of the outer roof 32.

[0131] The outer roof 32 shown in Figures 8 and 10 comprises a main body portion 210 and a cover portion 211. Figure 10 is a cross-sectional view of the roof unit 30 along line A2 shown in Figure 9. The main body portion 210 is formed in a substantially rectangular shape, having a size approximately the same as the inner roof 31 in a plan view, so that it can cover the inner roof 31 from above. The main body portion 210 is fixed to the inner roof 31. In this embodiment, the main body portion 210 is fixed to the inner roof 31 using a tool. An opening 210a is formed in the main body portion 210.

[0132] The opening 210a is formed to communicate with the internal space of the roof unit 30 (more specifically, the filter housing 121). The opening 210a is formed on the right rear side of the main body 210. In plan view, the opening 210a is formed in a rectangular shape that is slightly larger than the filter device 161. Therefore, the filter device 161 can pass through the opening 210a vertically.

[0133] With the configuration of the opening 210a, even if the filter device 111 is enlarged, the filter device 161 can be installed in the roof unit 30 without difficulty. More specifically, as shown in Figure 10, the filter device 161 is made to protrude above the main body 210 through the opening 210a, thereby avoiding interference between the outer roof 32 and the filter device 161. Furthermore, by making the filter device 161 protrude upward, the ceiling height at the rear of the roof unit 30 can be secured.

[0134] The cover portion 211 is the part for opening and closing the opening 210a. The cover portion 211 is formed in a rectangular shape in plan view, slightly larger than the opening 210a. The cover portion 211 is equipped with a protrusion 211a that bulges upward. The protrusion 211a is formed in the middle of the left and right sides of the cover portion 211. The protrusion 211a bulges upward according to the shape of the filter device 161. More specifically, the protrusion 211a bulges upward to the extent that it can cover from above the part of the filter device 161 that protrudes upward from the main body portion 210.

[0135] The cover portion 211 is detachably fixed to the main body portion 210 (around the opening 210a). In this embodiment, the cover portion 211 is configured to be detachable from the main body portion 210 without the use of tools. For example, the cover portion 211 can be attached to the main body portion 210 via a knob bolt by turning the knob bolt by hand. By attaching the cover portion 211 to the main body portion 210 in this way, the opening 210a can be closed and the filter device 161 can be protected.

[0136] Furthermore, by removing the cover portion 211 from the main body portion 210, the opening 210a can be opened. As a result, the filter device 161 is exposed to the outside of the roof unit 30 through the opening 210a, allowing maintenance of the filter device 161 to be performed without removing the main body portion 210 from the inner roof 31, thereby improving work efficiency.

[0137] As shown in Figures 10 and 18, a first sealing member 220 and a second sealing member 230 are provided between the outer roof 32 and the inner roof 31, as configured as described above. Figure 18 is a schematic representation of the shape of the equipment inside the roof unit 30 (such as the air conditioning unit 140) and the shape of the roof unit 30 for illustrative purposes. The first sealing member 220 and the second sealing member 230 will be described below.

[0138] The first sealing member 220 and the second sealing member 230 are for sealing the space between the outer roof 32 and the inner roof 31. The first sealing member 220 and the second sealing member 230 are made of an elastically deformable material (for example, rubber).

[0139] The first sealing member 220 is provided to seal at least the space in which the filter device 161 is located. In this embodiment, the first sealing member 220 is arranged to surround the filter housing 121 in a plan view.

[0140] The second sealing member 230 is provided to seal at least the space (connection portion 122) in which the second guide member 166 is located. In this embodiment, the second sealing member 230 is positioned along the outer edge of the outer roof 32 in a plan view. The second sealing member 230 is positioned to surround the various components (blower 130 and 163, air conditioning unit 140, etc.) housed in the roof unit 30 in a plan view. The filter device 161 and the first sealing member 220 are positioned inside the second sealing member 230 in a plan view.

[0141] The first sealing member 220 and the second sealing member 230, while positioned on the inner roof 31, are elastically deformed by being sandwiched between the inner roof 31 and the outer roof 32 (main body 210). This prevents water from entering the area surrounded by the first sealing member 220 (first sealing area) in a plan view, thereby preventing the filter device 111 from getting wet. It also prevents water from entering the area surrounded by the second sealing member 230 (second sealing area) in a plan view, thereby preventing malfunctions in the air conditioning unit 140 and the blower 130, etc. Thus, in this embodiment, the filter housing 121 where the filter device 161 is located and the connection part 122 where the second guide member 166, etc. are located are individually sealed by the first sealing member 220 and the second sealing member 230.

[0142] Furthermore, since the first sealing member 220 is positioned inside the second sealing member 230 (second sealing region) in a plan view, the multiple sealing members (first sealing member 220 and second sealing member 230) can prevent water from entering the region surrounded by the first sealing member 220 (first sealing region).

[0143] As shown in Figure 18, in this embodiment, the fasteners 34 that secure the inner roof 31 to the cabin frame 20 are positioned inside the second sealing member 230 in a plan view. The fasteners 34 are positioned offset in a plan view from the various components (blowers 130 and 163, air conditioning unit 140, second guide member 166, etc.) housed in the internal space of the roof unit 30. With this configuration, the blowers 130, etc., are less likely to get in the way when securing the inner roof 31 with the fasteners 34 using a tool, making it easier to secure the inner roof 31 to the cabin frame 20.

[0144] Furthermore, as shown in Figures 19(a) and 20, in this embodiment, fasteners 240 (such as bolts) that secure the inner roof 31 and the outer roof 32 are arranged to penetrate the first sealing member 220. This allows the outer roof 32 to be pressed firmly against the first sealing member 220, improving the sealing performance of the filter housing 121. Although not shown in the figures, the inner roof 31 and the outer roof 32 are also fixed to each other by bolts or the like in areas other than around the filter housing 121.

[0145] In this embodiment, a discharge section 250 is provided to discharge water that has entered the upper surface of the inner roof 31 (the contact area with the first seal member 220) from between the fastener 240 and the first seal member 220 to the outside of the roof unit 30. The configuration of the discharge section 250 will be described below with reference to Figures 19 and 20.

[0146] The discharge section 250 is equipped with a groove 251 and a pipe 252. The groove 251 shown in Figures 19(b) and 20 guides water that has entered the upper surface of the inner roof 31 to the filter housing 121 (the first seal area surrounded by the first seal member 220). The groove 251 is formed around the filter housing 121. In Figure 19(b), the portion of the upper surface of the inner roof 31 that comes into contact with the first seal member 220 (the contact portion) is shown with diagonal lines.

[0147] As shown in Figures 19(b) and 20, the groove 251 in this embodiment is formed in a substantially U-shape in plan view, along the periphery of the filter housing 121. The groove 251 is formed by the upper surface of the inner roof 31 being recessed downwards. An extension 251a is also formed in the groove 251, extending toward the filter housing 121. Note that the groove 251 is not shown in Figure 10.

[0148] The first sealing member 220 is placed on the inner roof 31 so as to overlap with the groove 251 in a plan view. Thus, the groove 251 in this embodiment is formed in the part of the inner roof 31 that comes into contact with the first sealing member 220 (contact portion). The configuration (shape, etc.) of the groove 251 described above is just an example and can be changed as appropriate. For example, the groove 251 may be formed in a rectangular ring shape in a plan view so as to surround the filter housing 121. The groove 251 may also be fixed to the upper surface of the inner roof 31 and formed on a different member from the outer roof 32.

[0149] The pipe 252 shown in Figure 19 guides water from the groove 251 to the outside air inlet 121a. One end of the pipe 252 is connected to the extension 251a of the groove 251. The other end of the pipe 252 is positioned at the outside air inlet 121a.

[0150] The discharge section 250 can guide water that has entered the upper surface of the inner roof 31 through the gap between the fastener 240 and the first sealing member 220 shown in Figure 20 to the extension section 251a shown in Figure 19(b) via the groove section 251. The water guided to the extension section 251a is then guided to the outside air inlet 121a via the pipe 252 and discharged to the outside of the roof unit 30 through the outside air inlet 121a. This prevents water from accumulating in the internal space of the roof unit 30. Furthermore, because the discharge section 250 guides water via the pipe 252 within the filter housing section 121, it prevents the filter device 161 from getting wet.

[0151] Furthermore, in this embodiment, the outside air inlet 121a for introducing outside air can be used to discharge water through the discharge section 250. This makes it possible to reduce the number of holes formed in the inner roof 31, for example, while ensuring the strength of the inner roof 31.

[0152] The configuration of the discharge section 250 described above is just one example and can be modified as appropriate. For example, the discharge section 250 can omit the piping 252. The discharge section 250 can also guide water that has entered the upper surface of the inner roof 31 to the outside of the first sealing member 220 and discharge it to the outside of the roof unit 30.

[0153] The following describes the air conditioner fixing structure 300 for securing the air conditioner unit 140, with reference to Figures 21 to 23. Figure 21 is a plan view showing details of the left front part (part P shown in Figure 9) of the roof unit 30. In Figure 21, some components (such as the air conditioner unit 140) are shown with diagonal lines for easier viewing.

[0154] The air conditioner fixing structure 300 is for fixing the left rear and right rear of the air conditioner unit 140. Since the structure for fixing the right rear of the air conditioner unit 140 is the same as the structure for fixing the left rear (symmetrical), the air conditioner fixing structure 300 will be explained below using the structure for fixing the left rear of the air conditioner unit 140 as an example, and the explanation of the structure for fixing the right rear of the air conditioner unit 140 will be omitted. The air conditioner fixing structure 300 comprises a first air conditioner fixing member 310, a reinforcing member 320, and a second air conditioner fixing member 330.

[0155] The first air conditioner fixing member 310 shown in Figures 21 and 22 is for fixing the air conditioner unit 140 to the upper surface of the inner roof 31. In this embodiment, a projection 140a is formed at the left rear end of the air conditioner unit 140, projecting toward the rear, and the first air conditioner fixing member 310 is configured to fix this projection 140a to the upper surface of the inner roof 31. The projection 140a is located to the left of the first guide portion 123 (see Figure 21(a)).

[0156] The first air conditioner fixing member 310 is formed in a shape obtained by appropriately bending a plate-shaped member. The first air conditioner fixing member 310 comprises a first portion 311, a second portion 312, and a third portion 313.

[0157] The first portion 311 shown in Figures 21 and 22 is the portion that overlaps with the upper surface of the inner roof 31 (the left side of the first guide portion 123) in a plan view. The first portion 311 is also the right side of the first air conditioner fixing member 310.

[0158] The second portion 312 is the portion that overlaps with the protruding portion 140a of the air conditioner unit 140 in a plan view. The second portion 312 is formed to the left of the first portion 311. Furthermore, the second portion 312 is formed at a higher position than the first portion 311.

[0159] The third portion 313 is the part that overlaps with the second air conditioner fixing member 330 in a plan view. The third portion 313 is formed on the rear side of the second portion 312. The third portion 313 is also formed at a higher position than the second portion 312. A bolt portion 313a extending upward is formed on the third portion 313.

[0160] As shown in Figure 22, the first portion 311 of the first air conditioner fixing member 310 is fixed to the upper surface of the inner roof 31 by a first fastener 341 such as a bolt. More specifically, the first portion 311 is fixed to the upper surface of the hollow portion (hollow section 31a) of the inner roof 31. In this embodiment, it is fixed to the hollow section 31a formed between the upper and lower surfaces of the inner roof 31 on the left side of the first guide portion 123. The first fastener 341 is attached to a receiving portion 342a (such as a crimp nut) provided on the upper surface of the inner roof 31. The second portion 312 and the protruding portion 140a of the air conditioner unit 140 are fixed to each other by a second fastener 342 such as a bolt.

[0161] In this manner, the air conditioning unit 140 is fixed to the upper surface of the inner roof 31 via the first air conditioning fixing member 310. With this configuration, the air conditioning unit 140 can be fixed using the upper surface of the inner roof 31. Therefore, regardless of the position of the cabin frame 20 (strengthening member), the air conditioning unit 140 can be fixed at any position, improving the design flexibility.

[0162] The reinforcing member 320 shown in Figure 22 is a member that reinforces the inner roof 31. The reinforcing member 320 is made of, for example, rubber. The reinforcing member 320 is positioned in the hollow portion 31a formed between the upper and lower surfaces of the inner roof 31. In this embodiment, the reinforcing member 320 is positioned to the left of the first guide portion 123 and is positioned opposite the first fastener 341. Since the inner roof 31 can be supported by the reinforcing member 320, deformation of the inner roof 31 around the first fastener 341 can be suppressed.

[0163] The configuration (material, arrangement, etc.) of the reinforcing member 320 described above is merely an example and can be modified as appropriate. For example, the reinforcing member 320 may be made of a material other than rubber. For example, the reinforcing member 320 may be made by filling the inner roof 31 with foam material. Although the reinforcing member 320 is positioned opposite the first fastener 341, the arrangement of the reinforcing member 320 is not particularly limited and may be positioned, for example, in a position that does not face the first fastener 341.

[0164] The second air conditioner fixing member 330 shown in Figures 21 and 22 is for fixing the air conditioner unit 140 to the cabin frame 20. The second air conditioner fixing member 330 is formed in a plate-like (strip-like) shape that extends in the left-right direction. A cylindrical portion 331 is formed on the second air conditioner fixing member 330.

[0165] As shown in Figures 21 and 23(a), the cylindrical portion 331 is formed to protrude downward from the right end of the second air conditioner fixing member 330. The cylindrical portion 331 is formed so that a fourth fastener 344, such as a bolt, can be inserted through it vertically. The vertical width of the cylindrical portion 331 is formed to be approximately the same as the width of the first guide member 150. In this embodiment, the cylindrical portion 331 is formed in a cylindrical shape.

[0166] As shown in Figures 21 and 22, the right end of the second air conditioner fixing member 330 rests on the third portion 313 of the first air conditioner fixing member 310. A bolt portion 313a is inserted through the right end of the second air conditioner fixing member 330. The first air conditioner fixing member 310 and the second air conditioner fixing member 330 are fixed to each other by attaching a third fastener 343, such as a nut, to the bolt portion 313a.

[0167] Furthermore, as shown in Figures 21 and 23, the left end of the second air conditioner fixing member 330 is positioned to overlap with the first guide member 150 in a plan view. The cylindrical portion 331 of the second air conditioner fixing member 330 is positioned to penetrate the first guide member 150 vertically.

[0168] As described above, the first guide member 150 is through which the conditioned air supplied from the air conditioning unit 140 into the cabin 10 flows (constitutes a supply path), but the cylindrical portion 331 is positioned to avoid the airflow path 151 of the conditioned air. Below, the configuration of the first guide member 150 so that the cylindrical portion 331 avoids the airflow path 151 will be described. As shown in Figure 23, the first guide member 150 is equipped with an airflow path 151 and a hole-forming portion 152.

[0169] The hole-forming portion 152 is a part that forms a hole separated from the flow path 151. The hole-forming portion 152 is formed in the portion of the first guide member 150 that overlaps with the second air conditioner fixing member 330 in a plan view. The cross-section of the hole-forming portion 152 is formed in a substantially annular shape in a plan view, with an inner diameter larger than the outer diameter of the cylindrical portion 331. The hole-forming portion 152 is also formed to penetrate the first guide member 150 vertically. Furthermore, the hole-forming portion 152 is formed to allow insertion of the cylindrical portion 331 and is separated from the flow path 151.

[0170] The cylindrical portion 331 of the second air conditioner fixing member 330 is inserted through the hole forming portion 152. The lower end of the cylindrical portion 331 abuts against the upper surface of the inner roof 31. In this state, a fourth fastener 344, such as a bolt, is inserted through the cylindrical portion 331.

[0171] The fourth fastener 344 penetrates the first guide member 150 and the inner roof 31 vertically and is attached to the cabin frame 20 (left side beam 25L in Figure 23(a)). This fixes the air conditioning unit 140 to the cabin frame 20 via the first air conditioning fixing member 310 and the second air conditioning fixing member 330.

[0172] Furthermore, the air conditioning unit 140 is fixed to the cabin frame 20 using a space within the first guide member 150 that is partitioned from the flow path 151. This configuration prevents the conditioned air (conditioned air from the air conditioning unit 140) flowing through the flow path 151 from leaking to the outside of the first guide member 150. In addition, by forming the hole-forming portion 152 at any position, the air conditioning unit 140 can be fixed at any position regardless of the arrangement of the first guide member 150, thereby improving the design flexibility.

[0173] As described above, the air conditioning unit 140, which is fixed to the inner roof 31, is connected to a heater hose 410 and a cooler hose 420, as shown in Figure 24. The heater hose 410 and the cooler hose 420 will be described below.

[0174] The heater hose 410 connects the air conditioning unit 140 and the engine 3 so that the refrigerant circulates between the air conditioning unit 140 and the engine 3. One end of the heater hose 410 is connected to the left side of the air conditioning unit 140. More specifically, one end of the heater hose 410 is connected to the left of the left-right center of the air conditioning unit 140 in the left-right direction. In this embodiment, one end of the heater hose 410 is connected to the left side of the air conditioning unit 140. A pair of heater hoses 410 are provided so that the refrigerant circulates between the air conditioning unit 140 and the engine 3.

[0175] As shown in Figure 25(a), the heater hose 410 is bent so as to fold back from the left side to the right side of the air conditioning unit 140. The heater hose 410 extends in the left-right direction in front of the air conditioning unit 140. Hereinafter, this portion of the heater hose 410 (the part that extends left and right in front of the air conditioning unit 140) will be referred to as the "heater extension portion 410a".

[0176] As shown in Figures 25(a) and 26, the heater hose 410 (heater extension portion 410a) is fixed to the front of the air conditioning unit 140 via the first band member 430. The heater extension portions 410a of the pair of heater hoses 410 are arranged in parallel in the vertical direction on the front side of the air conditioning unit 140 (inside the roof unit 30). This allows the heater hoses 410 to be arranged vertically to save space.

[0177] As shown in Figure 25(a), the heater hose 410 is guided to the outside of the roof unit 30 via a hose insertion part 124b formed on the right side of the roof unit 30. As shown in Figure 27, the heater hose 410 guided to the outside of the roof unit 30 passes through the inside of the right front pillar 21R located on the right front side of the cabin 10 and extends downward inside the right front pillar 21R. Note that in Figure 27, only one of the pair of heater hoses 410 is shown, and the other heater hose 410 is omitted.

[0178] The heater hose 410, which extends from the right front pillar 21R, extends forward from the lower end of the right front pillar 21R and connects to the engine 3.

[0179] In this embodiment, the air conditioning unit 140 is positioned on the front side of the roof unit 30 and is located relatively close to the right front pillar 21R in the front-to-rear direction. Therefore, by routing the heater hose 410 through the right front pillar 21R, the length of the heater hose 410 can be made relatively short, thus saving space.

[0180] The cooler hose 420 shown in Figures 24 and 25(b) connects the air conditioning unit 140, the compressor 13, and the condenser 14 so that the refrigerant circulates through the unit. One end of the cooler hose 420 is connected to the right side of the air conditioning unit 140. More specifically, one end of the cooler hose 420 is connected to the right of the right-center of the air conditioning unit 140 in the right-right direction. In this embodiment, one end of the cooler hose 420 is connected to the right rear of the air conditioning unit 140. A pair of cooler hoses 420 are provided so that the refrigerant circulates through the air conditioning unit 140, the compressor 13, and the condenser 14 (see Figure 1).

[0181] One of the pair of cooler hoses 420 connects the condenser 14 and the air conditioning unit 140, guiding the refrigerant cooled in the condenser 14 to the air conditioning unit 140. Hereinafter, this cooler hose 420 will be referred to as the "first cooler hose 421". The refrigerant flows in liquid form through the first cooler hose 421.

[0182] The other end of the pair of cooler hoses 420 connects the compressor 13 to the air conditioning unit 140 so as to guide the refrigerant from the air conditioning unit 140 to the compressor 13. Hereinafter, this cooler hose 420 will be referred to as the "second cooler hose 422". The refrigerant flows through the second cooler hose 422 in a gaseous state. The second cooler hose 422 is formed to have a larger diameter than the first cooler hose 421 (see Figure 26).

[0183] A pair of cooler hoses 420 extend forward from the right rear end of the air conditioning unit 140, and then bend to the left. The cooler hoses 420 extend in the left-right direction in front of the air conditioning unit 140 and the heater hose 410 (heater extension 410a). Hereinafter, the portion of the first cooler hose 421 and the second cooler hose 422 that extends left and right in front of the air conditioning unit 140 will be referred to as the "cooler extension 421a and 422a".

[0184] The cooler extensions 421a and 422a of the first cooler hose 421 and the second cooler hose 422 are provided in parallel in the front-to-back direction on the front side of the air conditioning unit 140 (in the internal space of the roof unit 30).

[0185] In this embodiment, the front part of the upper surface of the outer roof 32 (the part in front of the air conditioning unit 140) is formed to slope downward towards the front. The vertical width of the internal space (front part) of the roof unit 30 partitioned by the outer roof 32 gradually decreases towards the front. Therefore, in this embodiment, a large-diameter cooler extension 422a is placed side by side behind a small-diameter cooler extension 421a. This makes it easier to position the first cooler hose 421 and the second cooler hose 422 on the roof unit 30 (outer roof 32) which slopes downward towards the front.

[0186] Furthermore, the cooler extension portion 422a of the second cooler hose 422 is arranged in parallel with the heater extension portion 410a in the front-rear direction. In this embodiment, a pair of heater extension portions 420a are arranged side by side behind the cooler extension portion 422a. As described above, the pair of heater extension portions 420a are arranged side by side vertically. The vertical width W410 from the upper end of the upper heater extension portion 410a to the lower end of the lower heater extension portion 410a is greater than the outer diameter of the cooler extension portion 422a.

[0187] Therefore, by arranging the heater extension 420a side by side behind the cooler extension 422a, it becomes easier to position the second cooler hose 422 and the pair of heater hoses 410 on the roof unit 30 (outer roof 32) which slopes downwards towards the front.

[0188] As shown in Figure 25(b), the cooler hose 420 is fixed to the front of the inner roof 31 (in front of the heater hose 410) via the second band member 440. In this embodiment, the heater hose 410 and the cooler hose 420 are fixed to different members. This makes it possible to suppress heat exchange between the heater hose 410 and the cooler hose 420.

[0189] The cooler hose 420 is guided to the outside of the roof unit 30 via a hose insertion part 124b formed on the left side of the roof unit 30. The cooler hose 420 guided to the outside of the roof unit 30 passes through the inside of the left front pillar 21L located on the left front side of the cabin 10 and extends downward from the left front pillar 21L (not shown).

[0190] A cooler hose 420 extending from the left front pillar 21L extends forward from the lower end of the left front pillar 21L and is connected to the compressor 13 and condenser 14 (not shown). More specifically, a first cooler hose 421 is connected to the condenser 14, and a second cooler hose 422 is connected to the compressor 13.

[0191] In this embodiment, the air conditioning unit 140 is positioned on the front side of the roof unit 30 and is located relatively close to the left front pillar 21L in the front-to-back direction. Therefore, by routing the cooler hose 420 through the left front pillar 21L, the length of the cooler hose 420 can be made relatively short, thus saving space.

[0192] Furthermore, the second cooler hose 422, which has a larger diameter than the first cooler hose 421, carries a refrigerant at a lower temperature than the first cooler hose 411. Since the second cooler hose 422 is relatively prone to condensation, an insulating material 422b (see Figure 26) may be attached to the second cooler hose 422. This can suppress condensation on the second cooler hose 422.

[0193] In this embodiment, of the heater hose 410 and cooler hose 420, the heater hose 410 is routed through a pillar located on the right side of the cabin 10 (see Figure 27). This improves comfort when getting in and out of the cabin 10.

[0194] More specifically, workers generally get on and off the tractor 1 from the left side, rather than the right side where numerous operating tools are located. In this case, workers do not touch the right-side pillar (right front pillar 21R) when getting on or off. Therefore, in this embodiment, the high-temperature heater hose 410 is placed on the right-side pillar to make it difficult for workers to feel the heat of the heater hose 410 when getting on or off. This improves the comfort of getting on and off.

[0195] Furthermore, a low-temperature cooler hose 420 is positioned on the left pillar (left front pillar 21L), which is easily touched by workers when getting in and out of the vehicle. This helps to suppress the temperature rise of the left pillar (making it less likely to feel hot) even when the air conditioning unit 140 is operating.

[0196] In this embodiment, the heater hose 410 is routed from the left side of the air conditioning unit 140 to the right side (right front pillar 21R), and the cooler hose 420 is routed from the right side of the air conditioning unit 140 to the left side (left front pillar 21L) (see Figure 24). In this embodiment, the heater hose 410 and the cooler hose 420 are arranged to intersect in a plan view, making it easier to route the heater hose 410 and the cooler hose 420 through the left and right pillars.

[0197] As described above, the work vehicle (tractor 1) according to this embodiment comprises an inner roof 31 having a hollow portion 31a formed between an upper surface and a lower surface, an outer roof 32 positioned above the inner roof 31 and forming an internal space between it and the inner roof 31, and an air conditioning unit 140 housed in the internal space and fixed to the upper surface of the inner roof (see Figures 21 and 22).

[0198] By configuring it in this way, the air conditioning unit 140 can be fixed in any position using the upper surface of the inner roof 31, thereby improving the design flexibility of the air conditioning unit 140.

[0199] Furthermore, the work vehicle (tractor 1) is further equipped with a reinforcing member 320 that is positioned in the hollow section 31a and reinforces the inner roof 31 (see Figure 22).

[0200] By configuring it in this way, the deformation of the inner roof 31 can be suppressed by reinforcing the inner roof 31 with the reinforcing member 320.

[0201] Furthermore, the reinforcing member 320 is positioned opposite the first air conditioner fastener (first fastener 341) that secures the air conditioner unit 140 to the upper surface of the inner roof 31 (see Figure 22).

[0202] By configuring it in this way, deformation of the inner roof 31 around the first air conditioner stopper (first fastener 341) can be suppressed.

[0203] Furthermore, the work vehicle (tractor 1) is further equipped with a cabin frame 20 that constitutes the framework of the cabin 10, and the air conditioning unit 140 is fixed to the upper surface of the inner roof 31 and the cabin frame 20 via a common air conditioning fixing member (first air conditioning fixing member 310) (see Figures 21 and 22).

[0204] By configuring it in this way, the air conditioning unit 140 can be fixed to the upper surface of the inner roof 31 and the cabin frame 20 using a common component (first air conditioning fixing member 310).

[0205] Furthermore, the work vehicle (tractor 1) is further equipped with a supply duct (first guide member 150) which constitutes a supply channel through which air supplied from the air conditioning unit 140 into the cabin 10 flows, and the air conditioning unit 140 is fixed to the cabin frame 20 using a second air conditioning fastener (fourth fastener 344) which is positioned to penetrate the supply duct vertically (see Figure 23(a)).

[0206] By configuring it in this way, the supply duct (first guide member 150) can be positioned regardless of the fixing position of the second air conditioner stopper (fourth fastener 344), thereby improving the design flexibility of the supply duct.

[0207] Furthermore, the supply duct (first guide member 150) has a hole-forming portion 152 that penetrates the supply duct vertically so that the second air conditioner stopper (fourth fastener 344) can be inserted through it, and which forms a hole that is partitioned from the supply flow path (see Figure 23).

[0208] By configuring it in this way, it is possible to suppress leakage of air flowing through the supply duct (first guide member 150).

[0209] In this embodiment, the tractor 1 is one form of a work vehicle. Furthermore, the first fastener 341 according to this embodiment is one form of the first air conditioner fastener. Furthermore, the first air conditioner fixing member 310 according to this embodiment is one form of an air conditioner fixing member. Furthermore, the first guide member 150 according to this embodiment is one form of implementation of a supply duct. Furthermore, the fourth fastener 344 according to this embodiment is one form of the second air conditioner fastener.

[0210] Furthermore, as described above, the work vehicle (tractor 1) according to this embodiment comprises a roof unit 30 having an internal space partitioned by an inner roof 31 and an outer roof 32, an air conditioning unit 140 housed in the internal space, a right-side pillar (right front pillar 21R and right rear pillar 22R) located on the right side of the cabin 10, a left-side pillar (left front pillar 21L and left rear pillar 22L) located on the left side of the cabin 10, and a heater hose 410 arranged to pass through the inside of the right-side pillar and connecting the air conditioning unit 140 and the engine 3 so that refrigerant circulates between the air conditioning unit 140 and the engine 3 (see Figure 24).

[0211] This configuration improves comfort when getting in and out of cabin 10. Specifically, the high-temperature heater hose 410 is positioned on the right pillar (right front pillar 21R, etc.), thus suppressing the temperature rise of the left pillar (left front pillar 21L, etc.). Since workers often get in and out of the work vehicle (tractor 1) from the left side, suppressing the temperature rise of the left pillar makes it less likely for workers to feel the heat (temperature rise of the left pillar) when getting in and out of the work vehicle.

[0212] Furthermore, the work vehicle (tractor 1) is equipped with a compressor 13 located in the engine compartment for compressing refrigerant, a condenser 14 located in the engine compartment for cooling the refrigerant compressed by the compressor 13, and a cooler hose 420 located inside the left pillar (left front pillar 21L, etc.) that connects the air conditioning unit 140, the compressor 13, and the condenser 14 so that the refrigerant circulates through the air conditioning unit 140, the compressor 13, and the condenser 14 (see Figure 24).

[0213] By configuring it in this way, the low-temperature cooler hose 420 is placed on the left pillar (left front pillar 21L, etc.), thus suppressing the temperature rise of the left pillar.

[0214] Furthermore, the air conditioning unit 140 is positioned at the front of the interior space, the right pillar is positioned at the front right of the cabin 10 and includes a right front pillar (right front pillar 21R) in which the heater hose 410 is located, and the left pillar is positioned at the front left of the cabin 10 and includes a left front pillar (left front pillar 21L) in which the cooler hose 420 is located (see Figures 24 and 27).

[0215] By configuring it in this way, the heater hose 410 and cooler hose 420 can be positioned using pillars that are relatively close to the front-to-back position of the air conditioning unit 140, thus allowing the length of the heater hose 410 and other components to be relatively short and saving space.

[0216] Furthermore, the heater hose 410 is provided with a heater extension portion 410a that extends left and right in the front of the air conditioning unit 140 within the internal space, and the cooler hose 420 is provided with cooler extension portions 421a and 422a that extend left and right in the front of the air conditioning unit 140 within the internal space (see Figure 24).

[0217] By configuring the unit in this way, the heater hose 410 and cooler hose 420 are positioned in front of the air conditioning unit 140, allowing for effective use of the space behind the air conditioning unit 140.

[0218] Furthermore, the heater hose 410 is connected to the left side of the air conditioning unit 140, and the cooler hose 420 is connected to the right side of the air conditioning unit 140 (see Figure 24).

[0219] By configuring it in this way, the heater hose 410 and the cooler hose 420 can be arranged to cross each other, making it easier to route the heater hose 410 and the cooler hose 420 through the left front pillar and the right front pillar (left front pillar 21L and right front pillar 21R).

[0220] Furthermore, the heater extension 410a and the cooler extensions 421a and 422a are arranged in parallel in the front-to-back direction (see Figure 26).

[0221] By configuring it in this way, the heater hose 410 and the cooler hose 420 can be arranged side by side in the internal space of the roof unit 30.

[0222] Furthermore, the cooler hose 420 includes a first cooler hose 421 that guides the refrigerant cooled by the condenser 14 to the air conditioning unit 140, and a second cooler hose 422 that is formed to be larger in diameter than the first cooler hose 421 and guides the refrigerant from the air conditioning unit 140 to the compressor 13, wherein the cooler extension portion 422a of the second cooler hose 422 is positioned behind the cooler extension portion 421a of the first cooler hose 421 (see Figure 26).

[0223] This configuration makes it easier to position the first cooler hose 421 and the second cooler hose 422 on the roof unit 30, which slopes downwards towards the front.

[0224] Furthermore, the second cooler hose 422 is provided with an insulating material 422b (see Figure 26).

[0225] By configuring it in this way, it is possible to suppress condensation in the second cooler hose 422, which is colder than the first cooler hose 421.

[0226] Furthermore, the middle portion of the heater hose 410 is fixed to either the air conditioning unit 140 or the inner roof 31 (in this embodiment, the air conditioning unit 140), and the middle portion of the cooler hose 420 is fixed to either the air conditioning unit 140 or the inner roof 31 (in this embodiment, the inner roof 31) (see Figure 24).

[0227] By configuring the system in this way, the heater hose 410 and the cooler hose 420 can be fixed to separate components, thereby suppressing heat exchange between the heater hose 410 and the cooler hose 420.

[0228] Furthermore, at least one of the heater hose 410 or the cooler hose 420 (in this embodiment, the heater hose 410) is provided in pairs in parallel in the vertical direction within the internal space (see Figure 26).

[0229] By configuring it in this way, a pair of heater hoses 410 or a pair of cooler hoses 420 can be arranged side by side, saving space.

[0230] In this embodiment, the tractor 1 is one form of a work vehicle. Furthermore, the right front pillar 21R and the right rear pillar 22R according to this embodiment are one form of the right-side pillar. Furthermore, the left front pillar 21L and the left rear pillar 22L according to this embodiment are one form of the left pillar. Furthermore, the right front pillar 21R according to this embodiment is one form of the right front pillar. Furthermore, the left front pillar 21L according to this embodiment is one form of the left front pillar.

[0231] Furthermore, as described above, the work vehicle (tractor 1) according to this embodiment comprises a roof unit 30 having an internal space partitioned by an inner roof 31 and an outer roof 32, a filter device 161 housed in the internal space and capable of removing substances to be removed from the external air introduced, a first sealing member 220 that seals at least the space in which the filter device 161 is located, and a second sealing member 230 that seals at least the space in which a duct (second guide member 166) connected to the filter device 161 is located (see Figure 18).

[0232] By configuring it in this way, the space where the filter device 161 is located and the space where the duct (second guide member 166) is located can be sealed separately.

[0233] Furthermore, the filter device 161 and the first sealing member 220 are positioned inside the second sealing region surrounded by the second sealing member 230 (see Figure 18).

[0234] By configuring it in this way, the intrusion of water into the first sealing area can be suppressed by the multiple sealing members (first sealing member 220 and second sealing member 230).

[0235] Furthermore, the work vehicle (tractor 1) is further equipped with a first fixing member (fastener 240) that is positioned to penetrate the first sealing member 220 and fixes the inner roof 31 and the outer roof 32 (see Figure 19).

[0236] By configuring it in this way, the first fixing member (fastener 240) that penetrates the first sealing member 220 can press the outer roof 32 against the first sealing member 220 with strong force, thereby improving the sealing performance of the first sealing area.

[0237] Furthermore, the inner roof 31 is further equipped with a discharge section 250 that discharges water to the outside of the roof unit 30 from the contact portion that is in contact with the first sealing member 220 (see Figure 19).

[0238] By configuring it in this way, water that has entered the internal space of the roof unit 30 from between the first fixing member (fastener 240) and the first sealing member 220 can be discharged to the outside of the roof unit 30, thereby preventing water from accumulating in the internal space.

[0239] Furthermore, the discharge portion 250 is provided with a groove portion 251 formed at least in part in the contact portion, which guides water from the contact portion to the first seal region surrounded by the first seal member 220 (see Figures 19(b) and 20).

[0240] By configuring it in this way, water can be discharged from the first sealing area using the groove 251.

[0241] Furthermore, the discharge section 250 discharges water to the outside of the roof unit 30 through an inlet (outside air inlet 121a) that introduces outside air from the roof unit 30 into the filter device 161 (see Figure 19).

[0242] By configuring it in this way, water can be discharged from the discharge section 250 using the air intake (outside air intake 121a) that introduces outside air. This makes it possible to reduce the number of holes formed in the inner roof 31, for example, while ensuring the strength of the inner roof 31.

[0243] Furthermore, the work vehicle (tractor 1) is further equipped with a pipe 252 that guides water from the groove 251 to the inlet (outside air inlet 121a) (see Figure 19).

[0244] By configuring it in this way, water can be guided through the piping 252, which prevents the filter device 161 from getting wet.

[0245] Furthermore, the work vehicle (tractor 1) comprises a cabin frame 20 that constitutes the framework of the cabin 10, and a second fixing member (fastener 34) which is positioned inside the second sealing area surrounded by the second sealing member 230 and fixes the inner roof 31 to the cabin frame 20 (see Figure 18).

[0246] By configuring it in this way, the inner roof 31 can be fixed to the cabin frame 20 inside the second seal area.

[0247] Furthermore, the second fixing member (fastener 34) is positioned offset in a plan view from the housing member, which is housed in the internal space and positioned inside the second sealing region (see Figure 18).

[0248] This configuration makes it easier to fix the inner roof 31 to the cabin frame 20 using the second fixing member (fastener 34) while the housing member is housed in the internal space.

[0249] Furthermore, the housing member includes blowers 130 and 163 for introducing outside air from the roof unit 30 into the internal space, a duct (second guide member 166), and an air conditioning unit 140 for supplying the air that has flowed through the duct into the cabin.

[0250] With this configuration, the inner roof 31 can be fixed to the cabin frame 20 by the second fixing member (fastener 34) while the blowers 130 and 163, the duct (second guide member 166), and the air conditioning unit 140 are housed in the internal space.

[0251] Furthermore, the cabin frame 20 comprises an upper frame whose upper part is formed in a frame shape by a pair of left and right beam sections (left side beam 25L and right side beam 25R) extending in the front-rear direction, and a pair of front and rear beam sections (front beam 23 and rear beam 24) extending in the left-right direction, and a pair of frame reinforcing members 28 provided at the corner formed by the rear beam section of the front and rear beam section and the pair of left and right beam sections, reinforcing the rear side of the upper frame, and the second fixing member (fastener 34) is attached to the pair of left and right beam sections, the pair of front and rear beam sections, and the pair of frame reinforcing members 28, respectively (see Figure 4).

[0252] By configuring it in this way, the second fixing member (fastener 34) can be attached to various members (a pair of left and right beam sections, a pair of front and rear beam sections, and a pair of frame reinforcing members 28) to securely fix the inner roof 31 to the cabin frame 20 in a balanced manner.

[0253] In this embodiment, the tractor 1 is one form of a work vehicle. Furthermore, the second guide member 166 in this embodiment is one form of duct implementation. Furthermore, the fastener 240 according to this embodiment is one form of the first fixing member. Furthermore, the outside air inlet 121a according to this embodiment is one form of an inlet. Furthermore, the fastener 34 according to this embodiment is one form of the second fixing member. Furthermore, the left side beam 25L and the right side beam 25R according to this embodiment represent one form of a pair of left and right beam sections. Furthermore, the front beam 23 and rear beam 24 according to this embodiment represent one form of a pair of front and rear beam sections.

[0254] Furthermore, as described above, the work vehicle (tractor 1) according to this embodiment comprises a roof unit 30 having an internal space partitioned by an inner roof 31 and an outer roof 32, an air conditioning unit 140 housed in the internal space and providing air conditioning for the cabin 10, a first filter device (filter device 111) capable of removing substances to be removed from the introduced outside air, a second filter device (filter device 161) capable of removing substances to be removed from the introduced outside air and different from the first filter device, and a switching mechanism 170 capable of switching between a first introduction state in which air purified by the first filter device is introduced into the air conditioning unit 140, a second introduction state in which air purified by the second filter device is introduced into the air conditioning unit 140, and an internal air circulation state in which air from inside the cabin 10 is introduced into the air conditioning unit 140 (see Figures 14 and 15).

[0255] By configuring it in this way, the switching mechanism 170 can switch between the first intake state shown in Figure 16(a), the second intake state shown in Figure 16(b), and the internal air circulation state shown in Figure 17, thereby improving convenience.

[0256] Furthermore, the work vehicle (tractor 1) further comprises an introduction member 167 having a first opening 167b into which air purified by the first filter device (filter device 111) is introduced, a second opening 167c into which air purified by the second filter device (filter device 161) is introduced, and a third opening 167d into which air from inside the cabin 10 is introduced, and a duct section (first guide section 123) that guides the air introduced into the introduction member 167 to the air conditioning unit 140 (see Figures 12 and 14).

[0257] By configuring it in this way, air can be introduced into the air conditioning unit 140 using a common path (introduction member 167 and duct section), thus simplifying the air circulation path.

[0258] Furthermore, the second opening 167c and the third opening 167d are formed downstream of the first opening 167b in the airflow direction of the first filter device (filter device 111), and the switching mechanism 170 comprises a first switching unit 171 that switches whether or not the air purified by the first filter device can be introduced into the first opening 167b, a second switching unit 173 that switches whether or not the air purified by the second filter device (filter device 161) can be introduced into the second opening 167c, a third switching unit 175 that switches whether or not air can flow between the first opening 167b, the second opening 167c and the third opening 167d in the airflow direction, and drive units (first drive unit 172, second drive unit 174 and third drive unit 176) that drive the first switching unit 171, the second switching unit 173 and the third switching unit 175 (see Figures 13 to 15).

[0259] By configuring it in this way, the first intake state, the second intake state, and the internal air circulation state can be switched by controlling the drive unit (first drive unit 172, etc.).

[0260] Furthermore, the first switching section 171 and the third switching section 175 are provided on the introduction member 167 (see Figure 14).

[0261] By configuring in this way, the first switching part 171 and the third switching part 175 can be provided by using a common member (introduction member 167).

[0262] Further, the work vehicle (tractor 1) further includes a detection part 180 that detects the switching state of the first switching part 171 (see FIG. 15(b)).

[0263] By configuring in this way, it is possible to grasp whether air can be introduced into the first opening 167b.

[0264] Further, the work vehicle (tractor 1) is connected to the second filter device (filter device 161), and includes a blower 163 that sends air purified by the second filter device, and a duct (second guiding member 166) that is connected to the blower 163 and the introduction member 167 and guides the air sent from the blower 130 to the introduction member 167. The second switching part 173 is configured to open and close the connection part (case 164) between the blower 163 and the duct (see FIG. 13).

[0265] By configuring in this way, it is possible to switch whether air can be introduced into the second opening 167c at a position relatively close to the second filter device (filter device 161) (the end part on the second filter device side of the duct).

[0266] Further, an inner air introduction part 126 that introduces the air in the cabin 10 into the internal space is formed in the inner roof 31, and the inner air introduction part 126, the second filter device (filter device 161), and the introduction member 167 are arranged in parallel along the left - right direction in plan view (see FIG. 9).

[0267] By configuring in this way, the spaces in front of and behind the inner air introduction part 126 and the second filter device (filter device 161) can be effectively utilized.

[0268] Note that the tractor 1 according to the present embodiment is an embodiment of a work vehicle. Further, the filter device 111 according to the present embodiment is an embodiment of a first filter device. Further, the filter device 161 according to the present embodiment is an embodiment of a second filter device. Further, the first guide part 123 according to the present embodiment is an embodiment of a duct part. Further, the first drive part 172, the second drive part 174, and the third drive part 176 according to the present embodiment are embodiments of drive parts.

[0269] Although the embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0270] For example, in the above embodiment, the tractor 1 is described as an example of a work vehicle, but other agricultural vehicles, construction vehicles, industrial vehicles, etc. may also be used.

[0271] Also, the configurations (shape, size, number, arrangement, etc.) of each member described in the above embodiment are not restrictive, and can be arbitrarily changed. For example, the filter device 161 of the present embodiment is formed in a cylindrical shape (see FIG. 8), but the shape of the filter device 161 is not limited to the present embodiment, and may be formed in a rectangular parallelepiped shape, for example.

[0272] Also, the filter device 111 is provided outside the roof unit 30 (see FIG. 5), but the arrangement of the filter device 111 is not limited to the present embodiment. The filter device 111 may be arranged, for example, in the internal space of the roof unit 30 or the internal space of the left rear pillar 22L.

[0273] Furthermore, while outside air is introduced into the roof unit 30 from the left and right rear pillars 22L and 22R, the area from which outside air is introduced is not limited to the left and right rear pillars 22L and 22R. For example, outside air may also be introduced into the roof unit 30 from the left and right front pillars 21L and 21R.

[0274] Furthermore, although the air conditioning unit 140 in this embodiment is fixed to the upper surface of the inner roof 31 to the side of the first guide portion 123 (see Figure 21), this is just one example, and the air conditioning unit 140 may be fixed to the upper surface of the inner roof 31 at a different location than in this embodiment.

[0275] Furthermore, although the air conditioning unit 140 is shown as being fixed to the upper surface of the inner roof 31 via other components (such as the first air conditioning fixing component 310), this is merely an example, and it may also be fixed directly to the upper surface of the inner roof 31 (without the use of other components).

[0276] Furthermore, although the heater hose 410 is positioned to pass through the inside of the right front pillar 21R (see Figure 27), the heater hose 410 may also be positioned to pass through the inside of another pillar located on the right side of the cabin 10 (right rear pillar 22R).

[0277] Furthermore, although the cooler hose 420 is positioned to pass through the inside of the left front pillar 21L, the cooler hose 420 may also be positioned to pass through the inside of another pillar (left rear pillar 22L) located on the left side of the cabin 10.

[0278] In this embodiment, the heater hose 410 is connected to the left side of the air conditioning unit 140 and the cooler hose 420 is connected to the right side of the air conditioning unit 140 (see Figure 24). However, the connection points of the heater hose 410 and other components to the air conditioning unit 140 are not particularly limited. For example, the heater hose 410 may be connected to the right side of the air conditioning unit 140 and the cooler hose 420 may be connected to the left side of the air conditioning unit 140.

[0279] In this embodiment, the cooler hose 420 is positioned in front of the heater hose 410 in the internal space of the roof unit 30 (see Figure 26), but this is just one example, and the front-to-back positional relationship between the heater hose 410 and the cooler hose 420 is not particularly limited.

[0280] In this embodiment, a pair of heater hoses 410 are arranged in parallel in the vertical direction within the internal space of the roof unit 30 (see Figure 26), but the arrangement of the heater hoses 410 is not limited to this. For example, the pair of heater hoses 410 may be arranged in parallel in the front-rear direction. Similarly, a pair of cooler hoses 420 (first cooler hose 421 and second cooler hose 422) are arranged in parallel in the front-rear direction (see Figure 26), but the arrangement of the cooler hoses 420 is not limited to this. For example, the pair of cooler hoses 420 may be arranged in parallel in the vertical direction.

[0281] In this embodiment, the heater hose 410 is fixed to the air conditioning unit 140 and the cooler hose 420 is fixed to the inner roof 31 (see Figure 24). However, the members to which the heater hose 410 and the cooler hose 420 are fixed are not particularly limited. For example, the heater hose 410 may be fixed to the inner roof 31 and the cooler hose 420 may be fixed to the air conditioning unit 140. Also, at least one of the heater hose 410 and the cooler hose 420 may be fixed to a member other than the air conditioning unit 140 and the inner roof 31.

[0282] Furthermore, although the first sealing member 220 is positioned inside the second sealing member 230 in a plan view (see Figure 18), the positional relationship between the first sealing member 220 and the second sealing member 230 is not limited to this. For example, the first sealing member 220 may be positioned outside the second sealing member 230 in a plan view. Figure 28 shows an example of the first sealing member 220 positioned outside the second sealing member 230.

[0283] The second seal member 230 shown in FIG. 28 is arranged so as to avoid the first seal member 220 and the filter device 161. More specifically, the right rear part of the second seal member 230 is arranged so as to be recessed inwardly to the left and right in plan view, and the first seal member 220 and the like are arranged in this recessed part. By arranging the first seal member 220 outside the second seal member 230, the first seal region sealed by the first seal member 220 and the second seal region sealed by the second seal member 230 can be completely separated.

[0284] As described above, the filter device 161 and the first seal member 220 are arranged outside the second seal region surrounded by the second seal member 230.

[0285] By configuring in this way, the first seal region and the second seal region can be completely separated, and it is possible to make it difficult for dust, moisture, etc. to move from one of the first seal region or the second seal region to the other.

Explanation of Signs

[0286] 1 Tractor 20 Cabin 21L Left front pillar 21R Right front pillar 22L Left rear pillar 22R Right rear pillar 31 Inner roof 31a Hollow part 32 Outer roof 111 Filter device 140 Air conditioner unit 161 Filter device 166 Second guide member 220 First seal member 230 Second seal member

Claims

1. A roof unit having an interior space partitioned by an inner roof and an outer roof, An air conditioning unit housed in the aforementioned internal space and providing air conditioning for the cabin, A first filter device capable of removing the target substances contained in the introduced external air, A second filter device, different from the first filter device, is capable of removing the target to be removed contained in the introduced external air. A switching mechanism that can switch between a first introduction state in which air purified by the first filter device is introduced to the air conditioning unit, a second introduction state in which air purified by the second filter device is introduced to the air conditioning unit, and an internal air circulation state in which air from inside the cabin is introduced to the air conditioning unit, Equipped with, Work vehicle.

2. An introduction member having a first opening into which air purified by the first filter device is introduced, a second opening into which air purified by the second filter device is introduced, and a third opening into which air from inside the cabin is introduced, A duct section that guides the air introduced into the introduction member to the air conditioner unit, It further possesses, The work vehicle according to claim 1.

3. The second opening and the third opening are It is formed downstream of the first opening in the flow direction of the air purified by the first filter device, The aforementioned switching mechanism is A first switching unit that switches whether or not the air purified by the first filter device can be introduced into the first opening, A second switching unit that switches whether or not the air purified by the second filter device can be introduced into the second opening, A third switching unit that switches whether or not air can flow between the first opening, the second opening and the third opening in the aforementioned flow direction, A drive unit that drives the first switching unit, the second switching unit and the third switching unit, Equipped with, The work vehicle according to claim 2.

4. The first switching unit and the third switching unit are The introduction member is provided with, The work vehicle according to claim 3.

5. The system further comprises a detection unit for detecting the switching state of the first switching unit, A work vehicle according to claim 3 or claim 4.

6. A blower connected to the second filter device and supplying air purified by the second filter device, A duct connected to the blower and the introduction member, which guides the air supplied from the blower to the introduction member, Furthermore, it is equipped with, The second switching unit is, The connection between the blower and the duct is configured to open and close. A work vehicle according to claim 3 or claim 4.

7. The aforementioned inner roof includes, An internal air intake section is formed to introduce the air inside the cabin into the internal space. The aforementioned internal air intake unit, the second filter device, and the intake member are, They are arranged in parallel along the left-right direction in a plan view. A work vehicle according to any one of claims 2 to 4.

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