Work vehicle

Abstract

To provide a working vehicle capable of reducing the overhang of a roof in the lateral direction.SOLUTION: The roof 30 constituting a ceiling portion of the cabin 10 and having an internal space in which devices can be accommodated, and the filter unit 160 disposed in the internal space so as to be located behind the roof 30 and including the filter device 161 capable of removing a removal target contained in introduced outside air, the blower 130 that introduces the outside air into the filter device 161, the second guide member 166 (first duct) through which the outside air that has passed through the filter device 161 flows, and the air conditioner unit 140 that is disposed in the internal space so as to be located on the front side of the roof 30 and supplies the outside air that has flowed through the second guide member 166 into the cabin 10 are provided, and the blower 130 and the second guide member 166 are disposed between the air conditioner unit 140 and the filter unit 160 in the front-rear direction in the internal space.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to work vehicle technology. [Background technology]

[0002] Conventionally, technology for a work vehicle equipped with a roof has been publicly known, as described in Patent Document 1, for example.

[0003] The work vehicle described in Patent Document 1 includes support columns, an upper frame, a roof, and an outside air filter. The upper frame connects the upper ends of the support columns. The roof is hollow and attached to the upper frame. Outside air inlets are formed on the left and right outer ends of the roof. The outside air filter is attached to the outside air inlets. Outside air is introduced into the interior space of the roof through the outside air inlets and purified by the outside air filter.

[0004] The roof of Patent Document 1 has to secure space at the left and right outer edges for installing an outside air filter and an outside air intake, so it ends up overhanging the upper frame relatively far to the left and right. As a result, when the work vehicle is traveling through a narrow work space, such as between trees, there is a risk that the overhanging parts of the roof on the left and right may come into contact with surrounding obstacles (trees, etc.), leaving room for improvement. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-43997 Summary of the Invention [Problem to be solved by the invention]

[0006] One aspect of the present disclosure has been made in consideration of the above-described situation, and the problem it aims to solve is to provide a work vehicle that can reduce roof overhang in the left-right direction. [Means for solving the problem]

[0007] The problem to be solved by one embodiment of the present disclosure has been described above, and next, the means for solving this problem will be described.

[0008] In one aspect of the present disclosure, the vehicle comprises a roof that forms the ceiling portion of the cabin and has an internal space capable of accommodating equipment therein, and a filter unit that is disposed in the internal space so as to be positioned behind the roof and that has a first filter device that can remove substances to be removed that are contained in the introduced outside air. According to one aspect of the present disclosure, it is possible to reduce the overhang of the roof in the left-right direction.

[0009] In one aspect of the present disclosure, the vehicle comprises a first blower that introduces outside air into the first filter device, a first duct through which the outside air that has passed through the first filter device circulates, and an air conditioning unit that is arranged in the interior space so as to be positioned in front of the roof and supplies the outside air that has circulated through the first duct into the cabin, and the first blower and the first duct are arranged in the interior space between the air conditioning unit and the filter unit in the fore-and-aft direction. According to one aspect of the present disclosure, the air conditioning unit, the filter unit, the first blower, and the first duct can be arranged in a front-to-back arrangement, thereby reducing the thickness of the roof.

[0010] In one aspect of the present disclosure, a second duct is provided through which outside air supplied from the air conditioning unit to the cabin circulates, and the second duct is positioned to extend rearward from the air conditioning unit along the side of the roof. According to one aspect of the present disclosure, the air conditioner outlet can be positioned in a position close to the face of the passenger inside the cabin.

[0011] In one aspect of the present disclosure, the roof is equipped with a second filter device that is different from the first filter device and is capable of removing targets contained in the introduced outside air, and the filter unit is equipped with a switching unit that can switch between a first state in which outside air is introduced into the first filter device and a second state in which outside air is introduced into the second filter device, and the first filter device, the second filter device and the switching unit are arranged in parallel in the left-right direction in a plan view on the rear side of the roof. According to one aspect of the present disclosure, the thickness of the roof can be reduced by arranging the first filter device, the second filter device, and the switching portion in parallel along the left-right direction in a plan view.

[0012] In one aspect of the present disclosure, the cabin includes left and right pillars that support the rear side of the roof, and a first pillar, one of the left and right pillars, is provided with a first air intake port for drawing in outside air to be introduced into the first filter device, and a second pillar, the other of the left and right pillars, is provided with a second air intake port for drawing in outside air to be introduced into the second filter device. According to one aspect of the present disclosure, by arranging the air intakes on the left and right pillars rather than on the sides of the roof, it is possible to reduce the protrusion of the roof in the left and right directions.

[0013] In one aspect of the present disclosure, at least one of the first filter device and the second filter device is disposed above the pillar so as to overlap with the pillar in a plan view. According to one aspect of the present disclosure, by positioning at least one of the first filter device and the second filter device relatively close to the pillar air intake, pressure loss can be reduced when introducing outside air into the filter device.

[0014] In one aspect of the present disclosure, the filter unit includes a second blower disposed adjacent to the first filter device and configured to introduce outside air into the first filter device. According to one aspect of the present disclosure, it is possible to reduce pressure loss when outside air flows between the first filter device and the second blower.

[0015] In one aspect of the present disclosure, the filter unit includes a flow meter capable of measuring the flow rate of the outside air that has passed through the first filter device. According to one aspect of the present disclosure, the flow rate of outside air supplied from the first filter device into the cabin can be measured. [Effects of the Invention]

[0016] According to one aspect of the present disclosure, it is possible to reduce the overhang of the roof in the left-right direction. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a left side view showing the overall configuration of a tractor according to one embodiment of the present disclosure; [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 1 is a plan view showing the cabin frame. [Figure 5] FIG. [Figure 6] A cross-sectional view taken along the line A1-A1 in FIG. 5. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] 10 is a cross-sectional view of the roof taken along line A2 shown in FIG. 9. [Figure 11] A cross-sectional view taken along line A3-A3 in FIG. 9. [Figure 12] 12 is a cross-sectional view of the first guide member taken along line A4 shown in FIG. 11. FIG. [Figure 13] FIG. 10 is a plan view showing a state in which the filter device is attached or detached. [Figure 14]FIG. 4 is a plan view schematically showing the circulation path of outside air in the inner roof. [Figure 15] FIG. 4 is a plan cross-sectional view schematically showing a first switching portion. [Figure 16] FIG. 4 is a plan cross-sectional view schematically showing a second switching portion. [Figure 17] 1A and 1B are schematic diagrams showing how outside air introduced from the left and right rear pillars circulate; [Figure 18] FIG. 4 is a plan view showing the first seal member and the second seal member. DETAILED DESCRIPTION OF THE INVENTION

[0018] In the following description, the directions indicated by arrows U, D, F, B, L, and R in the figures are defined as upward, downward, forward, backward, leftward, and rightward, respectively.

[0019] First, the overall configuration of a tractor 1, which is a work vehicle according to one embodiment of the present disclosure, will be described. As shown in Fig. 1, the tractor 1 mainly includes a body frame 2, an engine 3, a hood 4, a transmission case 5, front wheels 6, rear wheels 7, fenders 8, a lifting device 9, a cabin 10, etc.

[0020] The machine body frame 2 is a frame-shaped member formed by appropriately combining a plurality of plate materials. The machine body frame 2 is disposed at the front of the tractor 1 with its longitudinal direction facing the front-to-rear direction. An engine 3 is fixed to the rear of the machine body frame 2. The engine 3 is covered by a hood 4. A transmission case 5 is provided at the rear of the engine 3. A transmission (not shown) that changes the speed of the power from the engine 3 is housed in the transmission case 5.

[0021] The front of the vehicle frame 2 is supported by a pair of left and right front wheels 6 via a front axle mechanism (not shown). The rear of the transmission case 5 is supported by a pair of left and right rear wheels 7 via a rear axle mechanism (not shown). The pair of left and right rear wheels 7 are generally covered from above by fenders 8.

[0022] A lifting device 9 is provided at the rear of the transmission case 5. Various types of working equipment (for example, a cultivator) can be attached to the lifting device 9. The lifting device 9 can raise and lower the attached working equipment by using an actuator such as a hydraulic cylinder.

[0023] The power of the engine 3 is changed in speed by a transmission (not shown) housed in a transmission case 5, and then transmitted to the front axle mechanism, and can be transmitted to the front wheels 6 via the front axle mechanism. Furthermore, the power changed in speed by the transmission can be transmitted to the rear wheels 7 via the rear axle mechanism. In this way, the front wheels 6 and rear wheels 7 are driven to rotate by the power of the engine 3, and the tractor 1 can travel. Furthermore, the power of the engine 3 can drive a working device attached to the lifting device 9.

[0024] A cabin 10 is provided behind the engine 3. The cabin 10 is mounted on the vehicle body (transmission case 5, etc.). An interior space for a passenger to sit in is formed inside the cabin 10. A seat 11 for the passenger to sit in is disposed in the interior space. A steering wheel 12 for adjusting the turning angle of the front wheels 6 is also disposed in front of the cabin 10.

[0025] Next, a description will be given of the configuration of the cabin 10. As shown in Figures 2 and 3, the cabin 10 mainly includes a cabin frame 20, a roof 30, and the like.

[0026] The cabin frame 20 constitutes the framework of the cabin 10. The cabin frame 20 is formed by combining longitudinal frame materials, plate-like members, etc. Specifically, as shown in Fig. 3 , the cabin frame 20 mainly includes 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, and a right side lower frame 27R.

[0027] The left front pillar 21L, the right front pillar 21R, the left rear pillar 22L, and the right rear pillar 22R are arranged with their longitudinal directions facing substantially vertically. The left front pillar 21L and the right front pillar 21R are arranged at a distance from each other on the left and right in the front part of the cabin 10. The left front pillar 21L and the right front pillar 21R support the front side of a roof 30, which will be described later. The left rear pillar 22L and the right rear pillar 22R are arranged at a distance from each other on the left and right in the rear part of the cabin 10. The left rear pillar 22L and the right rear pillar 22R support the rear side of the roof 30.

[0028] As described above, the cabin frame 20 of this embodiment is a four-pillar cabin frame 20 with no 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 modified as desired. For example, the cabin frame 20 may be a six-pillar cabin frame 20 with a center pillar disposed 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 FIGS. 3 and 4 constitute the upper part of the cabin frame 20. The front beam 23 and other components are arranged with their longitudinal directions oriented substantially horizontally. The front beam 23 is arranged to connect the upper ends of the left front pillar 21L and the right front pillar 21R. The rear beam 24 is arranged to connect the upper ends of the left rear pillar 22L and the right rear pillar 22R. The left side beam 25L is arranged to connect the upper ends of the left front pillar 21L and the left rear pillar 22L. The right side beam 25R is arranged 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 into a rectangular frame shape in a plan view.

[0030] In this embodiment, the left side beam 25L and the right side beam 25R are connected to each other by a reinforcing member 310. This improves the rigidity of the upper part of the cabin frame 20. The reinforcing member 310 will be described later.

[0031] The rear lower frame 26 shown in Fig. 3 is arranged to connect the lower ends of the left rear pillar 22L and the right rear pillar 22R. The left side lower frame 27L is arranged to extend downward and forward from the left rear pillar 22L. The right side lower frame 27R is arranged to extend downward and forward 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 a side view that bulges upward and forward, and fenders 8 are fixed to the lower parts of the left side lower frame 27L and the right side lower frame 27R, respectively.

[0032] The roof 30 forms the ceiling portion of the cabin 10. The roof 30 is provided on the upper part of the cabin frame 20 and is arranged so as to cover the seat 11 from above. The roof 30 mainly comprises an inner roof 31 and an outer roof 32.

[0033] The inner roof 31 is fixed to the upper part of the cabin frame 20 and forms the ceiling of the interior of the cabin 10. An air conditioning unit 140 (described later) and the like are arranged inside the inner roof 31. The outer roof 32 is arranged above the inner roof 31 and fixed to the upper part of the inner roof 31. The outer roof 32 is formed so as to cover the inner roof 31 from above. The outer roof 32 and the inner roof 31 form the roof 30 into a hollow, approximately box-like shape.

[0034] In the cabin 10 according to this embodiment, outside air can be introduced into the interior of the roof 30 through the left rear pillar 22L and the right rear pillar 22R. An air conditioning unit 140 inside the roof 30 conditions the air inside the roof 30. The air conditioned by the air conditioning unit 140 is blown out into the cabin. Below, the structures related to the air flow as described above will be described in order.

[0035] First, the structure of the left rear pillar 22L and its surroundings (filter housing member 110, etc.) shown in FIGS. 5 and 6 will be described.

[0036] The left rear pillar 22L is formed in a longitudinal shape extending vertically. The left rear pillar 22L is also formed in a curved shape that bulges slightly outward on the left and right sides. The left rear pillar 22L is formed in a hollow shape with a substantially rectangular cross section (see FIG. 6). An opening 22La that connects the interior and exterior of the left rear pillar 22L is formed in the side surface of the left rear pillar 22L facing substantially leftward.

[0037] The opening 22La is for taking 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 opening 22La is formed on the left side surface of the left rear pillar 22L. The configuration of the openings 22La (number, shape, etc.) is not particularly limited and can be changed as appropriate. The left rear pillar 22L can introduce outside air 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 30 from the upper end of the left rear pillar 22L.

[0038] 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 hollow, generally rectangular parallelepiped that is long in the vertical direction. The filter housing member 110 is formed so as to fit along the left rear pillar 22L (in a curved shape that bulges slightly outward to the left and right). The right side of the filter housing member 110 is open. The left side (inlet surface 110a) of the filter housing member 110 is formed in a mesh shape with many small openings 110b formed therein. Note that the openings 110b are not shown in FIG. 5.

[0039] The filter device 111 removes the target particles (dust and dirt) contained in the outside air. The filter device 111 is formed in a generally rectangular parallelepiped shape that is long in the vertical direction. The filter device 111 is also formed to allow the outside air to pass through from the left to the right. The filter device 111 allows the outside air to flow through and is equipped with a filter that captures the target particles. The filter device 111 is housed in the filter housing member 110.

[0040] The filter housing member 110 is fixed to the left rear pillar 22L with the filter device 111 housed therein. At this time, the filter housing member 110 is positioned so that an opening 22La formed on the left side surface 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 30 in a plan view), and can remove dust and dirt contained in the outside air introduced into the left rear pillar 22L.

[0041] The following describes how outside air is introduced through the left rear pillar 22L. When air is sucked in by a blower 130 arranged inside the roof 30 (described later), the outside air passes through the inlet surface 110a of the filter housing member 110, is filtered by a 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. The outside air flows upward inside the left rear pillar 22L and is guided to the roof 30.

[0042] Next, the structure of the right rear pillar 22R will be described.

[0043] 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 used to take in outside air to be introduced into a filter device 161, which will be described later.

[0044] 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), and dust and other particles contained in the outside air introduced into the right rear pillar 22R are removed within the roof 30 (by the filter unit 160 described later).

[0045] Next, the structure of the roof 30 will be described.

[0046] As described above, the roof 30 is formed hollow by the inner roof 31 and the outer roof 32. As shown in Fig. 8, the roof 30 (inner roof 31) houses devices such as the air conditioning unit 140. First, the configuration of the inner roof 31 will be described.

[0047] As shown in Figures 8 and 9, the inner roof 31 is formed in a generally rectangular shape in a plan view, with a size similar to that of the frame formed by the front beams 23, rear beams 24, etc. A plurality of 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 30 is formed by being partitioned by the inner walls of the inner roof 31 and the outer roof 32. Figure 14 shows a schematic diagram of the shapes of the recesses and other parts of the inner roof 31 to explain the interior space of the roof 30. As shown in Figure 14, the interior space of the roof 30 is formed with an introduction section 120, a filter accommodating section 121, a connection section 122, a first guide section 123, an air conditioner accommodating section 124, and a second guide section 125.

[0048] The introduction section 120 is a section into which outside air purified by the filter device 111 is introduced. The introduction section 120 is formed in the rear of the roof 30. More specifically, the introduction section 120 is formed rearward of the front-rear center of the roof 30 in the front-rear direction. The introduction section 120 is formed to extend laterally from near the left end of the roof 30 to near the left-right center. A blower 130, which will be described later, is accommodated in the right end of the introduction section 120. The left end of the introduction section 120 overlaps with the left rear pillar 22L (see FIG. 3) in a plan view. An outside air introduction port 120a is formed in the left end of the introduction section 120 so as to vertically penetrate the inner roof 31. The outside air introduction port 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 introduction section 120 via the outside air introduction port 120a.

[0049] The filter accommodating portion 121 accommodates a filter device 161 (described later) and is a portion through which outside air is introduced into the filter device 161. The filter accommodating portion 121 is formed in the right rear portion of the roof 30. More specifically, the filter accommodating portion 121 is formed rearward of the center between the front and rear of the roof 30 in the front-rear direction. The filter accommodating portion 121 is also formed to the right of the center between the left and right of the roof 30 in the left-right direction. The filter accommodating portion 121 overlaps with the right rear pillar 22R (see FIG. 3) in a plan view. An outside air inlet 121a is formed in the filter accommodating portion 121 so as to penetrate the inner roof 31 in the vertical direction. 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 accommodating portion 121 through the outside air inlet 121a.

[0050] The connecting portion 122 is a portion that connects the introduction portion 120 and the filter accommodating portion 121 to each other. The connecting portion 122 is formed at the rear end of the roof 30. The connecting portion 122 is formed so as to extend to the left and right. The right end of the connecting portion 122 is connected to the filter accommodating portion 121. The left end of the connecting portion 122 is connected to the left and right midpoints of the introduction portion 120.

[0051] The first guide portion 123 is formed to extend in the front-to-rear direction in approximately the left-to-right center of the roof 30. The upper side of the first guide portion 123 is covered with a cover. This allows the first guide portion 123 to guide outside air in the front-to-rear direction. The rear end of the first guide portion 123 is connected to the right end of the introduction portion 120. The front end of the first guide portion 123 is connected to the air conditioner housing portion 124, which will be described later. The first guide portion 123 is formed so that its left-to-right width gradually increases from the rear to the front.

[0052] The air conditioner housing portion 124 is formed in the front part of the roof 30. More specifically, the air conditioner housing portion 124 is formed forward of the front-to-rear center of the roof 30 in the front-to-rear direction. The air conditioner housing portion 124 is also formed to extend from near the left end to near the right end of the roof 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 portion 124. An air outlet 124a is formed in the air conditioner housing portion 124 so as to vertically penetrate the inner roof 31.

[0053] The air outlets 124a are formed at both left and right ends of the air conditioner housing portion 124. The air outlets 124a are formed so as to open to the interior space of the cabin 10. As a result, conditioned air from the air conditioning unit 140 (described later) is blown out into the interior of the cabin 10 through the air outlets 124a.

[0054] The second guide portions 125 are formed on both the left and right sides of the first guide portion 123. The second guide portions 125 are connected to both the left and right ends of the air conditioner housing portion 124. The second guide portions 125 are formed to extend rearward from the air conditioner housing portion 124. An air outlet 125a is formed in the second guide portion 125 so as to vertically penetrate the inner roof 31.

[0055] Two air outlets 125a are formed in each of the left and right second guide portions 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.

[0056] 3, the inner roof 31 is fixed from above to the cabin frame 20. More specifically, the inner roof 31 is placed on the front beam 23, the rear beam 24, the left side beam 25L, and the right side beam 25R, and is fixed to the front beam 23 and the like with fasteners such as bolts.

[0057] As described above, in this embodiment, the front beam 23 and the like are not sandwiched between the inner roof 31 and the outer roof 32 from above and below, but rather the bottom surface of the inner roof 31 (roof 30) is placed on the front beam 23 and the like. This allows the front beam 23 and the like to be disposed on the outside of the roof 30, thereby increasing the free space within the roof 30. Furthermore, the increased free space makes it possible to secure space to accommodate devices such as the air conditioning unit 140 without having to increase the size of the roof 30.

[0058] Next, a description will be given of the members housed in the roof 30. As shown in Figures 9 and 14, the roof 30 houses a blower 130, an air conditioning unit 140, a first guide member 150, and a filter unit 160.

[0059] The blower 130 is a device for sending outside air into the air conditioning unit 140. The blower 130 is housed in the right end of the introduction section 120 (near the connection with the first guide section 123). The blower 130 is connected to the rear end of the first guide section 123. The blower 130 can send the outside air introduced into the introduction section 120 toward the first guide section 123.

[0060] The air conditioning unit 140 is a device for performing air conditioning. The air conditioning unit 140 is housed in the air conditioning housing portion 124 (on the front side of the roof 30). An air inlet (not shown) of the air conditioning unit 140 is connected to the front end portion of the first guide portion 123.

[0061] The first guide member 150 guides air conditioned by the air conditioning unit 140 (air supplied into the cabin 10). The first guide member 150 is formed in a cylindrical shape extending in the front-to-rear direction. A pair of first guide members 150 are provided on the left and right sides with the air conditioning unit 140 in between. The first guide members 150 are housed in the roof 30 so as to extend from both the left and right ends of the air conditioning housing portion 124 to the second guide portion 125.

[0062] The front end of the first guide member 150 is connected to air outlets (not shown) formed on the left and right side surfaces of the air conditioning unit 140. In this way, the first guide member 150 is arranged to extend rearward from the connection portion with the air conditioning unit 140 along the side of the roof 30. The front portion of the first guide member 150 is connected to an air outlet 124a formed in the air conditioning housing portion 124. The rear portion of the first guide member 150 is connected to an air outlet 125a formed in the second guide member 125.

[0063] The filter unit 160 removes substances to be removed from the outside air and guides the substances to the introduction section 120. The filter unit 160 includes a filter device 161, a mounting member 162, a blower 163, a first switching section 164, a flow meter 165, and a second guide member 166.

[0064] The filter device 161 shown in FIGS. 8 and 9 removes substances to be removed contained in the outside air. The filter device 161 is formed in a substantially cylindrical shape. A filter (not shown) that allows the flow of outside air and captures the substances to be removed is provided inside the filter device 161. This filter has a higher performance in removing the substances to be removed than the filter device 111 (see FIG. 6) provided in 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, the filter can remove vapor, aerosols, and the like in addition to dust and dirt (the substances to be removed by the filter device 111).

[0065] The filter device 161 is housed in the filter accommodating portion 121 with its axis oriented in the front-to-rear direction. As shown in FIG. 10 , the bottom of the filter accommodating portion 121 (the right rear portion of the inner roof 31) is formed to bulge downward in accordance with the shape of the filter device 161. More specifically, the bottom of the filter accommodating portion 121 is formed in a recessed shape that can house approximately the lower half of the filter device 161. The filter device 161 is disposed in this bulging portion, and is disposed above the right rear pillar 22R. The filter device 161 is in communication with the right rear pillar 22R via an outside air inlet 121a of the filter accommodating portion 121 (see FIG. 14 ).

[0066] 8, the filter device 161 is disposed on the right side of the roof 30 (the side closest to the right rear pillar 22R of 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.

[0067] The front-to-rear width of the filter device 161 is smaller than the front-to-rear width of the filter accommodating portion 121. Therefore, as shown in Figures 9 and 14, a gap 121b is formed in the filter accommodating portion 121, allowing the filter device 161 to move in the front-to-rear direction when the filter device 161 is accommodated therein.

[0068] Fig. 13 shows filter device 161 moved forward from the state shown in Fig. 9. As shown in Fig. 13, filter device 161 is formed with protruding portion 161a that protrudes rearward. Protruding portion 161a is formed in a cylindrical shape. Filter device 161 can discharge outside air from which dust and the like have been removed, from the tip of protruding portion 161a.

[0069] 9 and 14 is a member to which the filter device 161 is detachably attached. The attachment member 162 is formed so as to be engageable with the protrusion 161a of the filter device 161. The attachment member 162 is housed in the filter housing portion 121.

[0070] 9 illustrates the filter device 161 with the protrusion 161a engaged with (attached to) the mounting member 162. When the filter device 161 is moved forward, the engagement with the mounting member 162 is released (see FIG. 13).

[0071] As described above, in this embodiment, the filter device 161 is attached to and detached from the mounting member 162 by moving the filter device 161 in the front-rear direction. As described above, the filter accommodating portion 121 is formed with the gap 121b that allows the filter device 161 to move along the front-rear direction (to allow movement in the front-rear direction). With this configuration, the filter device 161 can be attached and detached by utilizing the gap 121b.

[0072] The blower 163 shown in FIGS. 9 and 14 is a device for introducing outside air into the filter device 161. The blower 163 is connected to the filter device 161 via an attachment member 162. The blower 163 can send the outside air purified by the filter device 161 to the left. The blower 163 is housed in the right end of the connection portion 122 and is disposed on the right side of the roof 30 (the right rear pillar 22R side of the left and right sides). The filter device 161 is disposed in the filter housing portion 121 adjacent to the right end of the connection portion 122. By disposing the filter device 161 and the blower 163 adjacent to each other around the right rear pillar 22R in this manner, it is possible to reduce pressure loss when outside air flows from the opening 22Ra of the right rear pillar 22R to the blower 163.

[0073] First switching unit 164 switches whether or not to allow the flow of outside air purified by filter device 161. First switching unit 164 is housed in connection unit 122 and is disposed on the left side of blower 163 (downstream in the direction of flow of outside air). First switching unit 164 is connected to blower 163. An example of the configuration of first switching unit 164 will be described below with reference to FIG. 15. Note that FIG. 15 is a plan cross-sectional view showing first switching unit 164 and its periphery, and the shapes of various components are depicted in a schematic manner for ease of explanation.

[0074] The first switching unit 164 includes a case 164a, an opening / closing member 164b, and a rotating shaft 164c. The case 164a is formed hollow. A flow path 164d is formed in the case 164a, allowing outside air to pass left and right. The opening / closing member 164b is a member that opens and closes the flow path 164d. The opening / closing member 164b is formed in a flat plate shape and is housed in the case 164a. The rotating shaft 164c is disposed with its axis facing in the vertical direction. The rotating shaft 164c supports the opening / closing member 164b so that it can rotate.

[0075] The first switching unit 164 can rotate the opening / closing member 164b around the axis of the rotation shaft 164c by a drive source such as a motor, thereby switching between a state in which the flow path 164d is open and outside air can circulate (the state of the opening / closing member 164b shown by the solid line in FIG. 15) and a state in which the flow path 164d is closed and outside air cannot circulate (the state of the opening / closing member 164b shown by the two-dot chain line in FIG. 15).

[0076] 15 is an example and can be modified as appropriate. For example, first switching unit 164 can open and close flow path 164d by sliding opening / closing member 164b vertically or horizontally instead of rotating it.

[0077] 9 and 14 measures the flow rate of outside air that has passed through the filter device 161. The flow meter 165 is formed so that air can pass through in the left-right direction. The flow meter 165 is housed in the connection part 122 and is disposed on the left side of the first switching part 164 (downstream in the direction of flow of outside air). The flow meter 165 is also connected to the first switching part 164.

[0078] 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 connecting portion 122 and is disposed on the left side of the flow meter 165. The second guide member 166 is connected to the flow meter 165 and the second switching unit 167.

[0079] The second switching unit 167 switches whether or not the outside air that has passed through the filter device 111 is allowed to circulate. The second switching unit 167 is housed in the introduction unit 120. An example of the configuration of the second switching unit 167 will be described below with reference to Fig. 16. Note that Fig. 16 is a plan cross-sectional view showing the second switching unit 167 and its periphery, and the shapes of various components are depicted in a schematic manner for ease of explanation.

[0080] The second switching unit 167 includes a case 167a, an opening / closing member 167b, and a rotating shaft 167c. The case 167a is hollow. A flow path 167d is formed in the case 167a, through which outside air can flow. The left end of the flow path 167d is connected to the outside air inlet 120a of the introduction unit 120. The left and right middle portions of the flow path 167d are connected to the second guide member 166. The right end of the flow path 167d is connected to the blower 130.

[0081] The opening / closing member 167b is a member that opens and closes the flow path 167d. More specifically, the opening / closing member 167b is a member that opens and closes between the portion of the flow path 167d that communicates with the second guide member 166 and the outside air introduction port 120a. The opening / closing member 167b is formed in a flat plate shape. The opening / closing member 167b is disposed inside the case 167a. The rotating shaft 167c is disposed with its axis facing in the vertical direction. The rotating shaft 167c supports the opening / closing member 167b so that it can rotate.

[0082] The second switching unit 167 can rotate the opening / closing member 167b around the axis of the rotation shaft 167c by a driving source such as a motor, thereby switching between a state in which the flow path 167d is open and outside air can circulate (the state of the opening / closing member 167b shown by the solid line in FIG. 16) and a state in which the flow path 167d is closed and outside air cannot circulate (the state of the opening / closing member 167b shown by the two-dot chain line in FIG. 16).

[0083] 16 is an example and can be modified as appropriate. For example, second switching unit 167 can open and close flow path 167d by sliding opening / closing member 167b vertically or horizontally instead of rotating it.

[0084] As shown in Fig. 14, in this embodiment, the various components (filter device 161, etc.) that make up the filter unit 160 are disposed on the rear side of the roof 30. More specifically, as described above, the filter device 161 and the mounting member 162 are housed in the filter housing portion 121 formed on the rear side of the roof 30, and other components (blower 163, etc.) are housed in the connection portion 122 formed at the rear end of the roof 30. By disposing the filter unit 160 on the rear side of the roof 30 in this way, it is possible to prevent the roof 30 from overhanging to the left and right. Therefore, when the tractor 1 travels through a narrow working space, such as between trees, it is possible to prevent contact with surrounding obstacles (trees, etc.).

[0085] Next, the circulation path of the outside air within the roof 30 configured as described above will be described.

[0086] The roof 30 of this embodiment can be switched between a state in which outside air is circulated from the outside air inlet 120a of the introduction section 120 (the state in FIG. 17(a)), and a state in which outside air is circulated from the outside air inlet 121a of the filter housing section 121 (the state in FIG. 17(b)). Therefore, below, we will first explain the flow path of outside air when outside air is circulated from the outside air inlet 120a of the introduction section 120.

[0087] When allowing outside air to flow through the outside air inlet 120a of the introduction section 120, the first switching section 164 is switched to a state that prevents the flow of outside air (see the opening / closing member 164b shown by the two-dot chain line in FIG. 15). The second switching section 167 is switched to a state that allows the flow of outside air (see the opening / closing member 167b shown by the solid line in FIG. 16). In this state, the blower 130 and the air conditioning unit 140 are operated. As a result, the outside air passes through the filter device 111 and is introduced into the introduction section 120 via the opening 22La of the left rear pillar 22L (see FIG. 6) and the outside air inlet 120a. As shown in FIG. 17(a), the outside air flows rightward through the introduction section 120 and then flows forward through the first guide section 123.

[0088] The outside air that has circulated through the first guide portion 123 is conditioned (temperature adjusted, etc.) by the air conditioning unit 140. The outside air (conditioned air) that has been conditioned by the air conditioning unit 140 flows through the first guide member 150 to the air outlets 124a and 125a and is supplied to the interior of the cabin 10. This makes it possible to air-condition the interior of the cabin 10 using the air introduced into the left rear pillar 22L (air purified by the filter device 111). Note that when the air introduced from the left rear pillar 22L is circulated inside the roof 30, the blower 163 is stopped.

[0089] Furthermore, in this embodiment, the first guide member 150 extends rearward from the air conditioning unit 140 and is connected to the air outlet 125a. The air outlet 125a is disposed closer to the seat 11 (see FIG. 1) in the front-to-rear direction than the front air outlet 124a. Therefore, by blowing conditioned air from the air outlet 125a, the conditioned air can be directed relatively close to the face and neck of a passenger seated in the seat 11, thereby improving the comfort of the passenger. For example, when the air conditioning unit 140 is operating in cooling mode, the conditioned air can be directed toward the neck, etc. of the passenger, thereby effectively making the passenger feel cool.

[0090] Next, a flow path of outside air when the outside air is circulated from the outside air inlet 121a of the filter housing portion 121 will be described.

[0091] When allowing outside air to flow through the outside air inlet 121a of the filter housing 121, the first switching unit 164 is switched to a state allowing the flow of outside air (see the opening / closing member 164b shown by the solid line in FIG. 15). The second switching unit 167 is switched to a state preventing the flow of outside air (see the opening / closing member 167b shown by the two-dot chain line in FIG. 16). In this state, the blowers 130 and 163 and the air conditioning unit 140 are operated. As a result, outside air is introduced into the filter device 161 shown in FIG. 17(b) through the opening 22Ra of the right rear pillar 22R (see FIG. 7) 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, the blower 163, and the like, and is introduced into the introduction unit 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 outside air in this way, various controls can be performed using the measurement results. For example, the pressure inside the cabin 10 (internal pressure) can be controlled.

[0092] The outside air introduced into the introduction section 120 flows through the first guide section 123, is conditioned by the air conditioning unit 140, and is blown out from the air outlet 124a etc. into the cabin 10, just as in the case where outside air is circulated from the outside air inlet 120a of the introduction section 120 (as in FIG. 17(a)). In this way, the air purified by the filter device 161 can be used to air-condition the interior of the cabin 10.

[0093] As described above, the filter device 161 has a higher removal performance for the target substance than the filter device 111, and therefore by circulating outside air from the outside air inlet 121a of the filter accommodating section 121, cleaner air can be supplied to the interior of the cabin 10.

[0094] The filter of filter device 161 is more difficult for outside air to pass through than the filter of filter device 111. For example, the filter of filter device 161 has a finer mesh than the filter of filter device 111. For this reason, in this embodiment, blower 163 is also operated in addition to blower 130 to ensure the supply of outside air to air conditioning unit 140.

[0095] In addition, in this embodiment, the roof 30 is configured to suppress an increase in thickness due to the various components being arranged horizontally in the internal space of the roof 30.

[0096] 9 and 14, the filter device 161, mounting member 162, and blower 163 are arranged in parallel along the front-to-rear direction. Furthermore, the first switching unit 164, flow meter 165, second guide member 166, and second switching unit 167 are arranged in parallel along the left-to-right direction relative to the filter device 161, etc. This prevents the filter device 161, blower 163, etc. from overlapping vertically, thereby reducing the thickness of the roof 30. In this embodiment, the filter device 111 is also arranged in parallel along the left-to-right direction relative to the second switching unit 167, etc. in a plan view.

[0097] Furthermore, the air conditioning unit 140, the first guide portion 123, the blower 130, and the filter unit 160 are arranged in parallel along the front-to-rear direction. In this embodiment, the air conditioning unit 140, the first guide portion 123, the blower 130, and the filter unit 160 are arranged in order from front to back. With this configuration, for example, it is possible to prevent the air conditioning unit 140 and the first guide portion 123 from overlapping vertically on the front side of the roof 30. This ensures a sufficient ceiling height (ceiling height) inside the cabin 10 on the front side of the roof 30, and ensures visibility for passengers. Furthermore, it is possible to prevent the blower 130 and the filter unit 160 from overlapping vertically on the rear side of the roof 30, and it is also possible to ensure a sufficient ceiling height on the rear side of the roof 30.

[0098] Additionally, the blower 130 is disposed to the left of the blower 163 of the filter unit 160 (the left rear pillar 22L side of the roof 30). This allows the blower 130 to be disposed relatively close to the left rear pillar 22L in a plan view, thereby reducing pressure loss when outside air flows from the left rear pillar 22L to the blower 130.

[0099] Furthermore, in this embodiment, air is introduced into the interior space of the roof 30 through the left rear pillar 22L and the right rear pillar 22R, rather than through the left and right side surfaces of the roof 30. This eliminates the need to install components (such as filters) required for introducing outside air on both the left and right sides of the roof 30, making it possible to prevent the roof 30 from protruding to the left and right.

[0100] Next, the configuration of the outer roof 32 will be described.

[0101] The outer roof 32 shown in Figures 8 and 10 includes a main body portion 210 and a cover portion 211. Note that Figure 10 is a cross-sectional view of the roof 30 taken along line A2 shown in Figure 9. The main body portion 210 is formed in a substantially rectangular shape with approximately the same size 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.

[0102] The opening 210a is open so as to communicate with the internal space of the roof 30 (more specifically, the filter housing portion 121). The opening 210a is formed in the right rear portion of the main body portion 210. The opening 210a is formed in a rectangular shape that is slightly larger than the filter device 161 in a plan view. Therefore, the filter device 161 can pass through the opening 210a in the vertical direction.

[0103] Due to the configuration of the opening 210a, even if the filter device 111 is large, the filter device 161 can be installed without difficulty on the roof 30. More specifically, as shown in Fig. 10, the filter device 161 can be made to protrude upward beyond the main body 210 through the opening 210a, thereby preventing interference between the outer roof 32 and the filter device 161. Furthermore, by making the filter device 161 protrude upward, the ceiling height on the rear side of the roof 30 can be ensured.

[0104] The cover portion 211 is a portion for opening and closing the opening 210a. The cover portion 211 is formed in a rectangular shape in a plan view that is slightly larger than the opening 210a. The cover portion 211 is provided with a protrusion 211a that bulges upward. The protrusion 211a is formed in the middle of the left and right parts of the cover portion 211. The protrusion 211a bulges upward in accordance with the shape of the filter device 161. More specifically, the protrusion 211a bulges upward to an extent that it can cover from above the portion of the filter device 161 that protrudes upward from the main body portion 210.

[0105] The cover part 211 is removably fixed to the main body part 210 (around the opening 210a). In this embodiment, the cover part 211 is configured to be able to be attached to and detached from the main body part 210 without using tools. For example, the cover part 211 is attached to the main body part 210 via a knob bolt or the like by turning the knob bolt by hand. By attaching the cover part 211 to the main body part 210 in this way, the opening 210a can be closed and the filter device 161 can be protected.

[0106] Furthermore, the opening 210a can be opened by removing the cover part 211 from the main body part 210. This exposes the filter device 161 to the outside of the roof 30 through the opening 210a, so maintenance of the filter device 161 can be performed without removing the main body part 210 from the inner roof 31, improving workability.

[0107] As shown in Figures 10 and 18, a first seal member 220 is provided between the outer roof 32 and inner roof 31 configured as described above. For the sake of explanation, Figure 18 schematically illustrates the shape of the equipment inside the roof 30 (such as the air conditioning unit 140) and the shape of the roof 30. The first seal member 220 serves to seal between the outer roof 32 and the inner roof 31. The first seal member 220 is made of an elastically deformable material (such as rubber). The first seal member 220 is formed in a generally rectangular ring shape in plan view that follows the outer edge of the outer roof 32. The air conditioning unit 140, the blower 130, and the like are disposed inside the first seal member 220 in plan view.

[0108] 13 and 18, the first seal member 220 is positioned so as to avoid the opening 210a of the main body 210 and the filter device 161. In this embodiment, the right rear portion of the first seal member 220 is positioned so as to be recessed inward in a plan view, and the filter device 161 and the like are positioned in this recessed portion. In this way, the first seal member 220 is positioned so that the filter device 161 and the like are located outside the first seal member 220.

[0109] With the main body 210 of the outer roof 32 fixed to the inner roof 31, the first seal member 220 is sandwiched between the inner roof 31 and the main body 210 and elastically deformed. This prevents water from entering the area (sealed area) surrounded by the first seal member 220 in a plan view, and can prevent malfunctions from occurring in the air conditioning unit 140, the blower 130, etc.

[0110] As described above, the first seal member 220 is provided so as to avoid the opening 210a and the filter device 161 (so that the filter device 161 and the like are disposed outside the sealing area). When performing maintenance on the filter device 161, the cover portion 211 is removed from the main body portion 210 to open the opening 210a, but the first seal member 220 remains sandwiched between the inner roof 31 and the main body portion 210 even after the cover portion 211 is removed (see FIG. 10). This allows for optimal maintenance of the filter device 161 without impairing the sealing properties.

[0111] In this embodiment, a second seal member 230 is provided between the main body portion 210 and the cover portion 211. The second seal member 230 serves to seal the gap between the main body portion 210 and the cover portion 211. The second seal member 230 is made of an elastically deformable material (e.g., rubber). The second seal member 230 is formed in a generally rectangular ring shape in a plan view that is slightly larger than the opening 210a. The second seal member 230 is disposed around the opening 210a.

[0112] With the cover portion 211 attached to the main body portion 210, the second seal member 230 is sandwiched between the main body portion 210 and the cover portion 211 and elastically deformed. This allows the second seal member 230 to seal between the main body portion 210 and the cover portion 211, and to prevent water from entering the area surrounded by the second seal member 230 in a plan view (sealed area). This makes it possible to prevent malfunctions in the filter device 161.

[0113] Next, the reinforcing member 310 of the cabin frame 20 will be described.

[0114] The reinforcing member 310 shown in Figures 4 and 9 reinforces the cabin frame 20. The reinforcing member 310 is formed in the shape of a plate extending in the left and right directions. As shown in Figure 11, the reinforcing member 310 has a protrusion 311 that bulges upward. The protrusion 311 is formed in the middle of the left and right parts of the reinforcing member 310. The left and right width of the protrusion 311 is greater than the left and right width of the front end part of the first guide part 123.

[0115] The left and right ends of the reinforcing member 310 are fixed to the left side beam 25L and the right side beam 25R via studs 320 and nuts 321, 322. In this way, the reinforcing member 310 connects the left side beam 25L and the right side beam 25R to each other and can suppress deformation of the left side beam 25L and the right side beam 25R.

[0116] 4, the reinforcing member 310 is disposed in the front-to-rear center of the frame formed by the front beam 23, the rear beam 24, the left side beam 25L, and the right side beam 25R. For example, the reinforcing member 310 is disposed in the front-to-rear direction between the air conditioning unit 140 disposed in front of the roof 30 mounted on the cabin frame 20 and the blower 130 disposed in the rear (see FIG. 9). This effectively prevents the left side beam 25L and the right side beam 25R from deforming laterally, thereby effectively increasing the rigidity of the cabin frame 20.

[0117] The structure for fixing the reinforcing member 310 will be described below using the right end portion of the reinforcing member 310 as an example.

[0118] 11, the stud 320 is formed in a stepped cylindrical shape with the outer diameter of the upper and lower middle sections being larger than the outer diameter of the upper and lower ends. The lower end of the stud 320 is inserted through the inner roof 31 and the right side beam 25R. The lower end of the stud 320 is threaded into a nut 321 fixed to the right side beam 25R, thereby fixing the stud 320 to the right side beam 25R. The inner roof 31 is also fixed to the right side beam 25R at the lower part of the stud 320.

[0119] The studs 320 are arranged to protrude upward from the first guide member 150. The right end of the reinforcing member 310 is fixed to the upper end of the studs 320 via nuts 322, thereby fixing the reinforcing member 310 to the right side beam 25R in the interior space of the roof 30. In this embodiment, the inner roof 31 is fixed to the right side beam 25R at the bottom of the studs 320, and the reinforcing member 310 is fixed to the top of the studs 320. With this configuration, the reinforcing member 310, right side beam 25R, and inner roof 31 can be fixed to one another via the studs 320.

[0120] In this way, the reinforcing member 310 is fixed using the studs 320 protruding from a member (first guide member 150) provided in the interior space of the roof 30. With this configuration, the reinforcing member 310 can be provided (post-installed) after the roof 30 is placed on the front beam 23 or the like.

[0121] Furthermore, by arranging the reinforcing member 310 in the internal space of the roof 30 (see FIG. 8 ), the shape of the inner roof 31 can be simplified. More specifically, as described above, the bottom surface of the inner roof 31 (roof 30) rests on the front beam 23, etc. For this reason, for example, when the reinforcing member 310 is arranged below the inner roof 31, unlike this embodiment, it is necessary to devise a shape for the lower part of the inner roof 31 to avoid interference with the reinforcing member 310. On the other hand, when the reinforcing member 310 is arranged in the internal space of the roof 30, it is not necessary to devise a shape for the lower part of the inner roof 31, and therefore the shape of the inner roof 31 can be simplified.

[0122] 8, the reinforcing member 310 is disposed so as to straddle the front end of the first guide portion 123. As described above, the reinforcing member 310 has the convex portion 311 that bulges upward formed thereon, and the convex portion 311 can prevent interference with the first guide portion 123.

[0123] As described above, the first guide member 150 guides the conditioned air from the air conditioning unit 140, and the studs 320 are provided so as to avoid the flow path 151 of the conditioned air.

[0124] 11 and 12, first guide member 150 includes a flow path 151 and a hole forming portion 152. Note that Fig. 12 is a cross-sectional view of first guide member 150 taken along line A4 shown in Fig. 11.

[0125] The hole forming portion 152 is a portion that forms a hole that is separated from the flow path 151. The hole forming portion 152 is formed in a front-to-rear midpoint of the first guide member 150. The hole forming portion 152 is formed in a generally annular shape in a plan view, with an inner diameter that is larger than the outer diameter of the stud 320 (upper and lower midpoints). The hole forming portion 152 is formed to penetrate the first guide member 150 from top to bottom. The hole forming portion 152 is also formed to extend from the upper surface to the lower surface of the first guide member 150. This separates the hole forming portion 152 from the flow path 151.

[0126] The upper and lower middle portions of stud 320 are inserted into hole forming portions 152. With this configuration, stud 320 can be provided in a space in first guide member 150 that is separated from flow path 151. This prevents stud 320 from penetrating flow path 151, making it possible to prevent conditioned air (conditioned air from air conditioning unit 140) flowing through flow path 151 from leaking to the outside of first guide member 150.

[0127] As described above, the tractor 1 (work vehicle) of this embodiment comprises a roof 30 that forms the ceiling portion of the cabin 10 and has an internal space capable of accommodating equipment therein, and a filter unit 160 that is arranged in the internal space so as to be positioned behind the roof 30 and that is equipped with a filter device 161 (first filter device) that can remove substances to be removed that are contained in the introduced outside air.

[0128] By configuring in this way, it is possible to reduce the overhang of the roof 30 in the left-right direction.

[0129] The tractor 1 also includes a blower 130 (first blower) that introduces outside air into the filter device 161, a first guide section 123 (first duct) through which the outside air that has passed through the filter device 161 circulates, and an air conditioning unit 140 that is arranged in the internal space so as to be positioned in front of the roof 30 and supplies the outside air that has circulated through the first guide section 123 into the cabin 10, and the blower 130 and the first guide section 123 are arranged in the internal space between the air conditioning unit 140 and the filter unit 160 in the fore-and-aft direction (see Figure 9).

[0130] By configuring in this way, the thickness of the roof 30 can be reduced.

[0131] The tractor 1 also has a first guide member 150 (second duct) through which outside air supplied from the air conditioning unit 140 into the cabin 10 flows, and the first guide member 150 is arranged to extend rearward from the air conditioning unit 140 along the side of the roof 30 (see Figure 9).

[0132] With this configuration, the air outlet 125a for the air conditioner (conditioned air) can be disposed in a position close to the faces of passengers inside the cabin 10.

[0133] The tractor 1 also has a filter device 111 (second filter device) that is different from the filter device 161 and is capable of removing substances to be removed that are contained in the introduced outside air, and the filter unit 160 has switching parts (first switching part 164 and second switching part 167) that can switch between a first state in which outside air is introduced into the filter device 161 and a second state in which outside air is introduced into the filter device 111, and the filter device 161, the filter device 111 and the switching parts are arranged in parallel along the left-right direction in a planar view on the rear side of the roof 30 (see Figure 14).

[0134] By configuring in this way, the thickness of the roof 30 can be reduced.

[0135] The cabin 10 also has left and right pillars (a right rear pillar 22R and a left rear pillar 22L) that support the rear side of the roof 30, and one of the left and right pillars, the right rear pillar 22R (first pillar), is provided with an opening 22Ra (first air intake port) that draws in outside air to be introduced into the filter device 161, and the other of the left and right pillars, the left rear pillar 22L (second pillar), is provided with an opening 22La (second air intake port) that draws in outside air to be introduced into the filter device 111 (see Figures 6 and 7).

[0136] By configuring in this way, it is possible to reduce the overhang of the roof 30 in the left-right direction.

[0137] Furthermore, at least one of the filter device 161 and the filter device 111 (filter device 161 in this embodiment) is arranged above the pillar (right rear pillar 22R) so as to overlap with the pillar in a plan view (see Figure 9).

[0138] With this configuration, the pressure loss when introducing outside air into the filter device 161 can be reduced.

[0139] The filter unit 160 is also provided with a blower 163 (second blower) that is disposed adjacent to the filter device 161 and that introduces outside air into the filter device 161 .

[0140] With this configuration, the pressure loss occurring when the outside air flows between the filter device 161 and the blower 163 can be reduced.

[0141] The filter unit 160 also includes a flow meter 165 that can measure the flow rate of the outside air that has passed through the filter device 161 .

[0142] With this configuration, the flow rate of the outside air supplied from the filter device 161 into the cabin 10 can be measured.

[0143] The tractor 1 according to this embodiment is one embodiment of a work vehicle. The filter device 161 according to this embodiment is one embodiment of a first filter device. The blower 130 according to this embodiment is an embodiment of a first blower. The first guide portion 123 according to this embodiment is an embodiment of a first duct. The first guide member 150 according to this embodiment is an embodiment of the second duct. The filter device 111 according to this embodiment is an embodiment of a second filter device. The first switching unit 164 and the second switching unit 167 according to this embodiment are one embodiment of the switching unit. The right rear pillar 22R and the left rear pillar 22L according to this embodiment are examples of left and right pillars. The right rear pillar 22R according to this embodiment is an embodiment of a first pillar. The opening 22Ra according to this embodiment is an embodiment of a first intake port. The left rear pillar 22L according to this embodiment is an embodiment of a second pillar. The opening 22La according to this embodiment is an embodiment of a second intake port. The blower 163 according to this embodiment is an embodiment of a second blower.

[0144] Furthermore, as described above, the tractor 1 (work vehicle) of this embodiment is equipped with a filter device 161 (first filter device) capable of removing substances to be removed contained in the introduced outside air, a filter device 111 (second filter device) different from the filter device 161 and capable of removing substances to be removed contained in the introduced outside air, a right rear pillar 22R (first pillar) that supports one side of the roof 30 of the cabin 10 in the left-right direction and has an opening 22Ra (first air intake port) that draws in the outside air to be introduced into the filter device 161, and a left rear pillar 22L (second pillar) that supports the other side of the roof 30 in the left-right direction and has an opening 22La (second air intake port) that draws in the outside air to be introduced into the filter device 111.

[0145] By configuring in this way, it is possible to reduce the overhang of the roof 30 in the left-right direction.

[0146] In addition, the filter device 161 is arranged on the right rear pillar 22R side of the roof 30 in a plan view (see Figure 9), and the filter device 111 is arranged on the left rear pillar 22L side of the roof 30 in a plan view (see Figure 6).

[0147] With this configuration, the pressure loss when introducing outside air into the filter devices 111·161 can be reduced.

[0148] The filter device 161 is formed to have higher removal performance than the filter device 111, and is disposed above the right rear pillar 22R so as to overlap with the right rear pillar 22R in a plan view (see FIG. 9).

[0149] With this configuration, the pressure loss when introducing outside air into the filter device 161 can be further reduced.

[0150] The filter device 161 is formed to have higher removal performance than the filter device 111 and is housed in a filter housing portion 121 (internal space) formed inside the roof 30.

[0151] With this configuration, the filter device 161, which has a relatively high removal performance and tends to be large, can be housed in the filter housing portion 121, which is suitable for housing large equipment.

[0152] The filter device 111 is accommodated in a filter accommodating member 110 (accommodating portion) provided in the left rear pillar 22L (see FIG. 6).

[0153] With this configuration, the filter device 111, which can be formed relatively small, can be provided in the left rear pillar 22L instead of in the interior space of the roof 30. This allows the interior space of the roof 30 to be used to accommodate other devices.

[0154] The tractor 1 also has a switching unit (first switching unit 164 and second switching unit 167) that can switch between a first state in which outside air is introduced into the filter device 161 and a second state in which outside air is introduced into the filter device 111, and the filter device 161, the filter device 111 and the switching unit are arranged in parallel along the left-right direction in a planar view (see Figure 14).

[0155] By configuring in this way, the thickness of the roof 30 can be reduced.

[0156] The tractor 1 is also equipped with a blower 163 (first blower) that can introduce outside air into the filter device 161 and is arranged on one of the left and right sides of the roof 30 closer to the right rear pillar 22R.

[0157] With this configuration, it is possible to reduce pressure loss when the outside air passes through the filter device 161 (when the outside air flows from the opening 22Ra to the blower 163).

[0158] The tractor 1 also includes a blower 130 (second blower) that can introduce outside air into the filter device 111 and is disposed closer to the left rear pillar 22L than the blower 163 in the left-right direction.

[0159] With this configuration, the pressure loss when the outside air passes through the filter device 111 can be reduced.

[0160] Moreover, the blower 130 can introduce outside air into both the filter device 161 and the filter device 111 .

[0161] With this configuration, it is possible to introduce outside air into the filter device 161 using both the blowers 130 and 162 .

[0162] The tractor 1 according to this embodiment is one embodiment of a work vehicle. The filter device 161 according to this embodiment is one embodiment of a first filter device. The filter device 111 according to this embodiment is an embodiment of a second filter device. The right rear pillar 22R according to this embodiment is an embodiment of a first pillar. The opening 22Ra according to this embodiment is an embodiment of a first intake port. The left rear pillar 22L according to this embodiment is an embodiment of a second pillar. The opening 22La according to this embodiment is an embodiment of a second intake port. The blower 163 according to this embodiment is an embodiment of a second blower. The first switching unit 164 and the second switching unit 167 according to this embodiment are one embodiment of the switching unit. The blower 163 according to this embodiment is an embodiment of a first blower. The blower 130 according to this embodiment is an embodiment of a second blower.

[0163] As described above, the tractor 1 (work vehicle) according to this embodiment comprises a cabin frame 20 that forms the framework of the cabin 10, and a roof 30 that has an internal space capable of accommodating equipment and whose bottom surface rests on a frame-shaped upper frame (front beam 23, rear beam 24, left side beam 25L, and right side beam 25R) that forms the upper part of the cabin frame 20.

[0164] By configuring in this way, it is possible to increase the internal space (empty space) of the roof 30 while suppressing an increase in the size of the roof 30 upward.

[0165] In addition, the upper frame (front beam 23, etc.) is formed by multiple beam sections (front beam 23, rear beam 24, left side beam 25L and right side beam 25R) extending horizontally, and is equipped with reinforcing members 310 (reinforcing sections) that are arranged in the internal space and connect the multiple beam sections together (see Figures 4 and 8).

[0166] By configuring it in this way, the reinforcing member 310 that increases the rigidity of the cabin frame 20 can be arranged using the internal space of the roof 30.

[0167] The reinforcing member 310 connects the left and right beam portions (the left side beam 25L and the right side beam 25R) together (see FIG. 4).

[0168] By configuring it in this way, the rigidity of the cabin frame 20 can be effectively increased.

[0169] The reinforcing member 310 is disposed in the center of the upper frame (front beam 23, etc.) in the front-rear direction (see FIG. 4).

[0170] By configuring it in this way, the rigidity of the cabin frame 20 can be effectively increased.

[0171] The tractor 1 also includes a first guide member 150 (duct) that is arranged in the internal space and forms a flow path 151 through which air supplied from the air conditioning unit 140 to the cabin 10 flows, and the reinforcing member 310 is fixed to the cabin frame 20 using a stud 320 (fastener) that is arranged to penetrate the first guide member 150 vertically.

[0172] By configuring it in this manner, the first guide member 150, the stud 320, and the reinforcing member 310 can be aligned vertically to prevent the roof 30 from expanding in size in the left-right direction, while the reinforcing member 310 arranged in the internal space can be suitably fixed to the cabin frame 20.

[0173] The first guide members 150 are provided in pairs spaced apart in the left-right direction (one of the horizontal directions), and the reinforcing member 310 has both left-right ends fixed to the beam portions (such as the right side beam 25R) using the studs 320 that pass through the pair of first guide members 150 (see Figures 9 and 11).

[0174] With this configuration, both ends of the reinforcing member 310 can be fixed to the plurality of beam portions using the studs 320 that pass through the first guide member 150 .

[0175] The first guide member 150 has a hole forming portion 152 that penetrates the first guide member 150 vertically so that the stud 320 can be inserted therethrough, and that forms a hole that is separated from the flow path (see Figures 11 and 12).

[0176] With this configuration, the reinforcing member 310 can be fixed using the studs 320 while preventing outside air flowing through the first guide member 150 from leaking.

[0177] The studs 320 fix the reinforcing member 310, the upper frame (right side beam 25R, etc.), and the roof 30 (inner roof 31) to one another (see FIG. 11).

[0178] By configuring in this manner, the roof 30 can be fixed to the cabin frame 20 using the studs 320.

[0179] The tractor 1 according to this embodiment is one embodiment of a work vehicle. Moreover, the front beam 23, rear beam 24, left side beam 25L and right side beam 25R according to this embodiment are examples of upper frames and beam portions. The reinforcing member 310 according to this embodiment is one embodiment of a reinforcing portion. The left side beam 25L and the right side beam 25R according to this embodiment are examples of left and right beam portions. The first guide member 150 according to this embodiment is an embodiment of a duct. The stud 320 according to this embodiment is an embodiment of a fastener.

[0180] As described above, the tractor 1 (work vehicle) according to this embodiment comprises an inner roof 31 that forms the ceiling inside the cabin 10, an outer roof 32 that is provided above the inner roof 31 and that, together with the inner roof 31, forms an internal space capable of accommodating equipment, a first sealing member 220 (sealing member) that seals between the inner roof 31 and the outer roof 32, and a filter device 161 that is capable of removing substances to be removed that are contained in the introduced outside air and that is positioned outside the sealed area surrounded by the first sealing member 220 in the internal space.

[0181] With this configuration, maintenance of the filter device 161 can be performed suitably without impairing the sealing performance.

[0182] The tractor 1 also comprises an attachment member 162 (filter attachment portion) to which the filter device 161 can be attached, and to which the filter device 161 can be attached or detached by moving the filter device 161 in a forward or backward direction (one direction), and a filter accommodating portion 121 formed in the internal space and accommodating the filter device 161 when attached to the attachment member 162, and a gap 121b (relief portion) is formed in the filter accommodating portion 121 to allow the filter device 161 to move in the forward or backward direction (see Figures 9 and 14).

[0183] With this configuration, the filter device 161 can be attached and detached by utilizing the gap 121b.

[0184] The filter device 161 is formed in a cylindrical shape and is attached to the attachment member 162 with its axis directed in the front-rear direction (see FIG. 8).

[0185] With this configuration, the direction of movement of the filter device 161 when it is attached or detached is aligned with the axial direction of the filter device 161, and the cylindrical filter device 161 can be suitably disposed.

[0186] In addition, at least one of the inner roof 31 and the outer roof 32 (the outer roof 32 in this embodiment) has an opening 210a that is open to communicate with the internal space and through which the filter device 161 can pass (see Figures 8 and 10).

[0187] With this configuration, the filter device 161 can be attached and detached using the opening 210a, and the maintainability of the filter device 161 can be improved.

[0188] The opening 210 a is formed in the outer roof 32 .

[0189] With this configuration, the filter device 161 can be attached and detached from the upper side of the roof 30.

[0190] At least one of the inner roof 31 and the outer roof 32 (the outer roof 32 in this embodiment) is provided with a cover portion 211 that can open and close the opening 210a.

[0191] With this configuration, the opening 210a can be closed by the cover portion 211.

[0192] The cover portion 211 is formed in a shape that bulges upward or downward (upward in this embodiment) according to the shape of the filter device 161 (see FIG. 10).

[0193] With this configuration, the opening 210a can be closed using the cover portion 211 having a shape that corresponds to the filter device 161. Furthermore, by making the cover portion 211 bulge upward or downward rather than left or right, it is possible to reduce the bulging of the roof 30 in the left-right direction that occurs when the filter device 161 is installed.

[0194] Furthermore, at least one of the inner roof 31 and the outer roof 32 (in this embodiment, both the inner roof 31 and the outer roof 32) is formed into a shape that bulges upward or downward depending on the shape of the filter device 161 (see Figure 10).

[0195] With this configuration, it is possible to reduce the projection of the roof 30 in the left-right direction due to the installation of the filter device 161.

[0196] The tractor 1 according to this embodiment is one embodiment of a work vehicle. The first seal member 220 according to this embodiment is one embodiment of a seal member. The mounting member 162 according to this embodiment is one embodiment of a filter mounting portion. The gap 121b according to this embodiment is an embodiment of a relief portion.

[0197] Although the embodiment of the present invention has 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.

[0198] For example, in the above embodiment, the tractor 1 is used as an example of a work vehicle, but other agricultural vehicles, construction vehicles, industrial vehicles, etc. may also be used.

[0199] Furthermore, the configurations (shapes, sizes, numbers, arrangements, etc.) of the components described in the above embodiments are not limited and can be changed as desired. For example, although the filter device 161 in this embodiment is formed in a cylindrical shape (see FIG. 8), the shape of the filter device 161 is not limited to this embodiment and may be formed in, for example, a rectangular parallelepiped shape.

[0200] Furthermore, although the filter device 111 is provided on the outside of the roof 30 (see FIG. 5), the location of the filter device 111 is not limited to this embodiment. The filter device 111 may be located, for example, in the interior space of the roof 30 or the interior space of the left rear pillar 22L.

[0201] Furthermore, although the outside air is introduced into the roof 30 through the left and right rear pillars 22L and 22R, the portions through which the outside air is introduced are not limited to the left and right rear pillars 22L and 22R. For example, the outside air may be introduced into the roof 30 through the left and right front pillars 21L and 21R.

[0202] Furthermore, although a mounting member 162 is provided between the filter device 161 and the blower 163 (see FIG. 13), this is not limited to this, and the filter device 161 may be directly connected to the blower 163.

[0203] In this embodiment, the filter device 161 protrudes upward from the roof 30 through the opening 210a formed in the outer roof 32 (see FIG. 10 ), but the arrangement of the filter device 161 is not limited to this embodiment. For example, the filter device 161 may protrude downward from the roof 30 through an opening formed in the inner roof 31. The cover portion 211 may be configured to close the opening in the inner roof 31.

[0204] In addition, in this embodiment, the filter device 161 is covered by the cover part 211 that is separate from the main body part 210, but the method for covering the filter device 161 is not limited to this embodiment. For example, the filter device 161 may be covered by the main body part 210 that is integrally formed with the cover part 211.

[0205] In this embodiment, both the cover portion 211 of the outer roof 32 and the inner roof 31 are configured to bulge out along the shape of the filter device 161 (see FIG. 10 ), but the shapes of the cover portion 211 and the inner roof 31 are not limited to this embodiment. For example, only one of the cover portion 211 or the inner roof 31 may bulge out along the shape of the filter device 161. Furthermore, as long as the filter device 161 can be installed without interfering with the roof 30, both the cover portion 211 and the inner roof 31 may not bulge out along the shape of the filter device 161.

[0206] In addition, in this embodiment, the opening 210a is opened and closed by attaching and detaching the cover part 211 to the outer roof 32, but the method for opening and closing the opening 210a by the cover part 211 is not particularly limited. For example, the opening 210a may be opened and closed by opening and closing the cover part 211 supported on the outer roof 32 via a hinge.

[0207] Furthermore, although the reinforcing member 310 is arranged in the center of the left and right of the cabin frame 20 (see FIG. 4), the position of the reinforcing member 310 is not limited to this embodiment. The reinforcing member 310 may be arranged in the front or rear of the cabin frame 20, for example.

[0208] Furthermore, although the reinforcing member 310 is fixed to the left and right beams (left side beam 25L and right side beam 25R) in the above embodiment, the beams to which the reinforcing member 310 is fixed are not limited to those in the present embodiment. The reinforcing member 310 may be fixed to the front and rear beams (front beam 23 and rear beam 24), for example. The number of reinforcing members 310 is not limited to one, and may be multiple. The multiple reinforcing members 310 may be fixed to different beams. For example, one of the two reinforcing members 310 may be fixed to the front or rear beam, and the other of the two reinforcing members 310 may be fixed to the left or right beam. [Explanation of symbols]

[0209] 1 Tractor 10 Cabins 20 Cabin Frame 22L left rear pillar 22La opening 22R Right rear pillar 22Ra opening 23 Front beam 24 rear beam 25L left side beam 25R right side beam 30 Roof 31 Inner roof 32 outer roof 111 Filters 160 Filter Unit 161 Filtering Device 220 First seal member

Claims

1. A roof that forms the ceiling of the cabin and has an internal space that can accommodate equipment inside. a filter unit disposed in the interior space so as to be located behind the roof, the filter unit including a first filter device capable of removing substances to be removed that are contained in the introduced outside air; A work vehicle equipped with:

2. a first blower that introduces outside air into the first filter device; a first duct through which outside air that has passed through the first filter device flows; an air conditioning unit that is disposed in the interior space so as to be located on the front side of the roof and that supplies outside air that has circulated through the first duct into the cabin; Equipped with The first blower and the first duct are In the internal space, the air conditioner unit is disposed between the air conditioner unit and the filter unit in the front-rear direction. The work vehicle according to claim 1 .

3. a second duct through which outside air supplied from the air conditioning unit to the cabin flows; The second duct is The air conditioner is arranged to extend rearward from the air conditioning unit along the side of the roof. The work vehicle according to claim 2 .

4. a second filter device that is capable of removing a substance to be removed that is contained in the introduced outside air and is different from the first filter device; The filter unit comprises: a switching unit that can switch between a first state in which outside air is introduced into the first filter device and a second state in which outside air is introduced into the second filter device; The first filter device, the second filter device, and the switching unit are The rear side of the roof is arranged so as to be parallel to each other in the left-right direction in a plan view. The work vehicle according to any one of claims 1 to 3.

5. The cabin is The vehicle includes left and right pillars that support the rear side of the roof, a first pillar of one of the left and right pillars is provided with a first air intake port that draws in outside air to be introduced into the first filter device; a second pillar of the other of the left and right pillars is provided with a second air intake port that takes in outside air to be introduced into the second filter device; The work vehicle according to claim 4.

6. At least one of the first filter device and the second filter device is The pillar is disposed above the pillar so as to overlap with the pillar in a plan view. The work vehicle according to claim 5.

7. The filter unit comprises: a second blower disposed adjacent to the first filter device and configured to introduce outside air into the first filter device; The work vehicle according to claim 2 .

8. The filter unit comprises: a flow meter capable of measuring the flow rate of outside air that has passed through the first filter device; The work vehicle according to claim 1 .

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