Cabin for work vehicle

Abstract

Provided is a cabin for a work vehicle that is capable of suppressing clogging of a filter with foreign matter.　A cabin for a work vehicle having a roof on which an air-guiding duct is formed comprises: a left rear pillar 22L provided at a rear part of the cabin and capable of guiding outside air to the roof; a filter 120 that purifies outside air introduced into the left rear pillar 22L; a filter housing part 130 that houses the filter 120; and a louver 140 that is arranged on the outdoor side with respect to the filter housing part 130 and provided so as to inhibit the circulation of foreign matter.

Description

Work vehicle cabin

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

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

[0003] Patent Document 1 describes a cabin that includes an inner roof that forms a ceiling facing the interior of the cabin, and an outer roof that is provided above the inner roof. An air conditioning unit is housed between the inner roof and the outer roof.

[0004] In some of these work vehicle cabins, outside air is introduced into the air conditioning unit through pillars that form the cabin's framework. Such cabins require a filter to purify the outside air. However, because the outside air around work vehicles can contain a lot of foreign matter, such as snow and dust, technology is needed to prevent the filter from becoming clogged with foreign matter.

[0005] JP 2018-25893 A

[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 cabin for a work vehicle that can prevent foreign matter from clogging the filter.

[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, a cabin for a work vehicle has a roof formed with a duct for guiding air, the cabin including: a rear pillar provided at the rear of the cabin and capable of guiding outside air to the roof; a filter that purifies the outside air introduced into the rear pillar; a filter housing that houses the filter; and a louver that is disposed on the exterior side of the filter housing and is provided to block the flow of foreign matter. According to one aspect of the present disclosure, the louver can prevent foreign matter (such as snow or dust) from clogging the filter.

[0009] In one aspect of the present disclosure, the louvers include blades that extend upward from the outdoor side toward the indoor side, making it difficult for foreign objects to pass through the blades and preventing the filter from becoming clogged with foreign objects.

[0010] In one aspect of the present disclosure, a plurality of the blades are provided and arranged so that the blades at least partially overlap each other when viewed from the outside of the room. According to this aspect of the present disclosure, it is difficult for foreign matter to pass between the blades, and clogging of the filter with foreign matter can be effectively suppressed.

[0011] In one aspect of the present disclosure, the slats include a main body portion that extends upward from the outdoor side toward the indoor side, and an upper bent portion that is bent upward from an indoor end of the main body portion. According to one aspect of the present disclosure, the upper bent portion can obstruct the flow of foreign matter, thereby effectively preventing foreign matter from clogging the filter.

[0012] In one aspect of the present disclosure, the slats include a main body portion that extends upward from the outdoor side toward the indoor side, and a lower bent portion that is bent downward from the outdoor side end of the main body portion. According to one aspect of the present disclosure, the lower bent portion can obstruct the flow of foreign matter, thereby effectively preventing foreign matter from clogging the filter.

[0013] In one aspect of the present disclosure, the louver further includes a support portion that supports the blades and is attached to the filter housing portion. According to one aspect of the present disclosure, the louver can be installed using the filter housing portion, thereby simplifying the configuration.

[0014] In one aspect of the present disclosure, the filter housing portion is formed with a cover portion that covers the upper end portion of the support portion from above. According to this aspect of the present disclosure, it is possible to prevent water from flowing between the upper end portion of the support portion and the filter housing portion and adhering to the filter.

[0015] According to one aspect of the present disclosure, clogging of the filter with foreign matter can be suppressed.

[0016] 17A and 17B are cross-sectional views of the left and right tractors, respectively; a left side view showing the overall configuration of a tractor according to one embodiment of the present disclosure; a rear perspective view showing a cabin; a rear exploded perspective view showing a cabin frame and a roof; a left side view showing a structure around a left rear pillar; an exploded perspective view of the same; a left side view showing a louver; a cross-sectional view taken along A1-A1 in FIG. 4; a cross-sectional view taken along A2-A2 in FIG. 7; a rear exploded perspective view showing an inner roof, a first cover member, and a second cover member; a plan view of the same; a plan view schematically showing an inner roof and a duct; a cross-sectional view taken along A3-A3 in FIG. 11; a cross-sectional view taken along A4-A4 in FIG. 11; (a) a rear perspective view showing the first cover member; (b) a rear perspective view showing the second cover member; a plan view of the roof; an enlarged plan view showing the left front portion of the roof; a cross-sectional view taken along A5-A5 in FIG. 17; a plan view showing a sealing member; a right side view showing a structure around an electric heating wire. 1 is an enlarged right side view showing a left rear pillar, a first fixing member, and a second fixing member;

[0017] In the following description, the directions indicated by arrows U, D, F, B, L, and R in the drawings are defined as the upward direction, downward direction, forward direction, backward direction, leftward direction, and rightward direction, respectively. Note that the forward direction is the direction in which the tractor 1 moves forward, and the backward direction is the direction in which the tractor 1 moves backward.

[0018] First, the overall configuration of a tractor 1, which is a work vehicle equipped with a cabin 10 according to one embodiment of the present disclosure, will be described.

[0019] The tractor 1 shown in FIG. 1 mainly comprises a machine frame 2, an engine 3, a bonnet 4, a transmission case 5, front wheels 6, rear wheels 7, fenders 8, a lifting device 9, a cabin 10, and the like.

[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. The transmission case 5 houses a transmission (not shown) that changes the speed of the power from the engine 3.

[0021] The front portion 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 portion 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 implements (e.g., a tiller) can be attached to the lifting device 9. The lifting device 9 can raise and lower the attached working implement by 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 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, doors 40, a rear panel 50, and the like.

[0026] The cabin frame 20 shown in Figure 3 constitutes the framework of the cabin 10. The cabin frame 20 is formed by combining longitudinal frame materials, plate-like members, etc. Specifically, 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, a right side lower frame 27R, a step 28, a floor seat 29, etc.

[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 oriented substantially vertically. The left front pillar 21L and the right front pillar 21R are arranged at a lateral distance from each other in the front portion of the cabin 10. The left rear pillar 22L and the right rear pillar 22R are arranged at a lateral distance from each other in the rear portion of the cabin 10.

[0028] As described above, the cabin frame 20 of this embodiment is a four-pillar cabin frame with no center pillar between the front pillars 21L, 21R and the rear pillars 22L, 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 with center pillars disposed between the front pillars 21L, 21R and the rear pillars 22L, 22R.

[0029] The front beam 23, rear beam 24, left side beam 25L, and right side beam 25R constitute the upper part of the cabin frame 20. The front beam 23 and other beams 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] The rear lower frame 26 is disposed to connect the lower ends of the left rear pillar 22L and the right rear pillar 22R. The left side lower frame 27L is disposed to extend downward and forward from the left rear pillar 22L. The right side lower frame 27R is disposed 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 the fenders 8 (see FIGS. 1 and 2) are fixed to the lower parts of the left side lower frame 27L and the right side lower frame 27R, respectively.

[0031] A step 28 constituting a floor is disposed below the cabin frame 20. The step 28 is fixed to the lower ends of the left front pillar 21L, the right front pillar 21R, the left side lower frame 27L, and the right side lower frame 27R. A floor sheet 29 is provided behind the step 28 at a position higher than the step 28, on which the seat 11 is placed.

[0032] The roof 30 is provided on the upper part of the cabin frame 20 and covers the seat 11 from above. The roof 30 mainly includes 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 inside the cabin 10. An air conditioning unit 330 (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.

[0034] As shown in Fig. 2, doors 40 are provided on the left and right sides of the cabin frame 20 (at the entrances and exits of the cabin 10) via a pair of upper and lower hinges 42 so as to be able to open and close. A rear panel 50 is provided on the rear of the cabin frame 20 so as to be able to open and close. A front panel (not shown) is also provided on the front of the cabin frame 20. In this way, an interior space is formed in the cabin 10 that is surrounded by the roof 30, the doors 40, the rear panel 50, and the front panel.

[0035] 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. In addition, cabin air (inside air) can also be introduced into the interior of the roof 30 through the inner roof 31. An air conditioning unit 330 inside the roof 30 conditions the air inside the roof 30. The air conditioned by the air conditioning unit 330 is blown out into the interior of the vehicle. Below, the structures related to the air flow as described above will be described in order.

[0036] First, the structure of the left rear pillar 22L and its surroundings (louver 140, etc.) shown in FIGS. 4 and 5 will be described.

[0037] The left rear pillar 22L shown in FIG. 5 is formed in a longitudinal shape extending vertically. The left rear pillar 22L is also formed in a curved shape that bulges slightly outward to the left and right. The left rear pillar 22L is formed in a hollow shape with a substantially rectangular cross section. A side surface of the left rear pillar 22L facing substantially leftward is formed with a plurality of openings 22a that connect the interior and exterior of the left rear pillar 22L. The illustration shows an example in which four rectangular openings 22a are formed vertically aligned on the left side surface of the left rear pillar 22L. The left rear pillar 22L can introduce outside air through the openings 22a. 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 pair of upper and lower door support portions 110 are provided on the left rear pillar 22L. Each door support portion 110 is formed in a cylindrical shape with its axis oriented in the vertical direction. As shown in FIGS. 4 and 5 , a pivot shaft 42a of a hinge 42 is inserted through the door support portion 110. The pivot shaft 42a pivotally supports a fixed portion 42b of the hinge 42. The fixed portion 42b has an outer fixed portion 42c disposed on the outer side of the door 40 and an inner fixed portion 42d (see FIG. 21 ) disposed on the inner side of the door 40. The door 40, the outer fixed portion 42c, and the inner fixed portion 42d are fixed to each other with fasteners such as bolts. In this way, the hinge 42 connects the door 40 to the left rear pillar 22L via the pivot shaft 42a and the fixed portion 42b so that the door 40 can be opened and closed.

[0039] The left rear pillar 22L is provided with a filter housing portion 130 and a louver 140. The left rear pillar 22L is also provided with a first cover member 150 and a second cover member 170 so as to cover the filter housing portion 130 and the like.

[0040] The filter housing 130 shown in FIGS. 5 and 7 is for housing the filter 120. The filter housing 130 is formed in a generally rectangular, hollow shape that is long in the vertical direction. The filter housing 130 is formed to fit the left rear pillar 22L (curved so as to bulge slightly outward to the left and right). A protrusion 133 that protrudes leftward is formed at the upper left end of the filter housing 130 (see FIGS. 5 and 8 ). The right side of the filter housing 130 is open. The left side (inlet surface 131) of the filter housing 130 is formed in a mesh-like shape with many small openings 132. Air can flow through the openings 132 in a direction perpendicular to the inlet surface 131. This allows air to flow from the outside to the inside of the filter housing 130 via the inlet surface 131 of the filter housing 130.

[0041] The filter 120, which is a substantially rectangular parallelepiped shape that is long in the vertical direction, is housed inside the filter housing portion 130. The filter 120 can remove dust particles contained in the air and purify the air.

[0042] The filter housing portion 130 is fixed to the left rear pillar 22L with the filter 120 housed therein. At this time, the filter housing portion 130 is positioned so that the opening 22a formed on the left side surface of the left rear pillar 22L is entirely covered by the filter housing portion 130.

[0043] The louver 140 shown in Figures 5 and 6 is intended to prevent foreign matter from clogging the filter 120. The louver 140 is disposed on the left side (outside the room) of the filter housing portion 130. The enlarged portion shown in Figure 6 is a front perspective view of the middle portion of the louver 140 between the top and bottom. As shown in Figures 6 and 8, the louver 140 includes a support portion 141 and blades 142.

[0044] The support portion 141 is a portion for supporting the blade 142. The support portion 141 is formed in a longitudinal shape that is long in the vertical direction. The vertical length of the support portion 141 is formed to be approximately the same as the vertical length of the left side surface of the filter housing portion 130. The support portion 141 is also formed to fit along the left rear pillar 22L. In this embodiment, the support portion 141 is divided (vertically) into two portions, an upper portion 141U and a lower portion 141D, and the upper portion 141U and the lower portion 141D are fixed to each other.

[0045] As shown in Figures 6 and 7, the support portion 141 includes a front wall portion 141a, a rear wall portion 141b, and a left wall portion 141c. The front wall portion 141a forms the front portion of the support portion 141. The front wall portion 141a is disposed so as to face the left front. The rear wall portion 141b forms the rear portion of the support portion 141. The rear wall portion 141b is disposed so as to face rearward. The left wall portion 141c forms the left portion of the support portion 141. The left wall portion 141c is disposed so as to face leftward and is disposed between the front wall portion 141a and the rear wall portion 141b.

[0046] The support portion 141 is fixed to the left side surface of the filter accommodating portion 130. The support portion 141 (louver 140) is arranged to cover the front portion of the introduction surface 131 of the filter accommodating portion 130. As shown in Fig. 8 , the upper end portion of the support portion 141 is covered from above by the protrusion 133 of the filter accommodating portion 130 (overlapping in plan view).

[0047] The blade 142 shown in Figures 6 and 8 is a plate-shaped portion for changing the flow direction of outside air. The blade 142 is provided on the left wall portion 141c. In this embodiment, the blade 142 is formed integrally with the left wall portion 141c. A plurality of blades 142 are provided at intervals above and below each other. The outside air that has flowed through the louver 140 can flow into the filter housing portion 130 through the gaps between the upper and lower blades 142. The blade 142 has a main body portion 142a, a lower bent portion 142b, and an upper bent portion 142c.

[0048] The main body 142a is a plate-like portion formed from the top to the bottom of the blade 142. The main body 142a is arranged with the plate surface facing upward and left. The main body 142a is formed so as to slope upward to the right (extending upward from the outside to the inside of the room).

[0049] The lower bent portion 142b is formed so as to bend downward from the lower end (the end on the outdoor side) of the main body portion 142a. The upper bent portion 142c shown in Fig. 8 is formed so as to bend upward from the upper end (the end on the indoor side) of the main body portion 142a.

[0050] The blades 142 are arranged so that at least a portion of each blade overlaps the other blade when viewed from the outside of the room (side view). In this embodiment, of two blades 142 adjacent to each other in the vertical direction, the upper bent portion 142c of the lower blade 142 and the lower bent portion 142b of the upper blade 142 are arranged so as to overlap (see the blades 142 shown enlarged in FIG. 8).

[0051] The louver 140 is formed, for example, by filling a mold (cavity) with material. The support portion 141 is formed in a curved shape that bulges slightly outward to the left and right so as to fit along the left rear pillar 22L. By molding the support portion 141 divided into upper and lower portions (an upper portion 141U and a lower portion 141D), it is possible to easily remove the louver 140 from the mold when molding it.

[0052] The first cover member 150 shown in Figures 5 and 7 is formed in a longitudinal shape extending vertically. The first cover member 150 is formed, for example, from a resin material. The vertical length of the first cover member 150 is formed to be approximately the same as the vertical length of the left rear pillar 22L. The first cover member 150 is formed in a concave shape that is open toward the front. A rear combination lamp 151, which integrates multiple lamps such as a brake lamp and a turn signal lamp, is provided on the rear surface of the first cover member 150.

[0053] 7 , the first cover member 150 is arranged so that the rear of the filter accommodating portion 130 and the rear end of the louver 140 are located inside the first cover member 150. This allows the first cover member 150 to cover and conceal the rear of the filter accommodating portion 130 (the rear surface of the filter accommodating portion 130 and the rear portion of the introduction surface 131) and the rear end of the louver 140 from the exterior side (rear side) of the cabin 10.

[0054] The longitudinal member 160 shown in Figures 5 and 7 is a longitudinal member that extends vertically. The longitudinal member 160 is made of an elastic material such as rubber. The longitudinal member 160 is attached to the left front end of the inner surface of the first cover member 150. This reduces the gap between the louver 140 and the first cover member 150, making it difficult for outside air to pass through the gap. Furthermore, since the longitudinal member 160 is made of an elastic material, the inner surface of the first cover member 150 can be protected.

[0055] The second cover member 170 is formed in a longitudinal shape extending vertically. The second cover member 170 is formed from a material (e.g., a metal material) different from that of the first cover member 150. The vertical length of the second cover member 170 is formed to be approximately the same as the distance between the pair of upper and lower hinges 42 of the door 40. The second cover member 170 is formed in a substantially rectangular plate shape with the plate surface facing in the left-right direction.

[0056] The second cover member 170 is disposed between a pair of upper and lower hinges 42 of the door 40. As shown in FIG. 7 , the rear end of the second cover member 170 is disposed so as to overlap the left front end of the first cover member 150 in the left-right direction. The front end of the second cover member 170 is disposed so as to be located forward of the front end of the filter accommodating portion 130. The front end of the second cover member 170 is also disposed so as to be located forward of the rear end of the door 40. This allows the second cover member 170 to conceal the front portion of the filter accommodating portion 130 (the front surface of the filter accommodating portion 130 and the introduction surface 131) and the louver 140 from the exterior side (left side) of the cabin 10. The second cover member 170 is disposed so as to leave a predetermined gap between the first cover member 150, the louver 140, and the door 40.

[0057] In this way, the filter housing portion 130 and the louver 140 are covered from the rear and left side by the first cover member 150 and the second cover member 170. Furthermore, the inlet surface 131 of the filter housing portion 130 is covered by the louver 140, the first cover member 150, and the second cover member 170 so as not to be exposed to the outside when viewed from the flow direction of the air flowing through the inlet surface 131 (i.e., the direction perpendicular to the inlet surface 131).

[0058] The manner in which outside air is introduced through the left rear pillar 22L configured as above will be described with reference to FIGS. 7 and 8. FIG.

[0059] When air is sucked in by a blower 320 disposed within the roof 30 (described later), outside air is introduced through an opening 22a in the left rear pillar 22L, and the outside air flows upward within the left rear pillar 22L and is guided to the roof 30. The outside air flows to the louver 140 through the gap between the first cover member 150 and the second cover member 170 shown in FIG. 7. The outside air passes through the louver 140 and the filter housing portion 130 (inlet surface 131), is filtered by the filter 120 housed in the filter housing portion 130, and is then introduced into the left rear pillar 22L.

[0060] Here, the first cover member 150 and the second cover member 170 are arranged in the direction in which the inlet surface 131 of the filter accommodating section 130 faces (a direction perpendicular to the inlet surface 131), so that the outside air does not flow vertically toward the inlet surface 131 of the filter accommodating section 130, but instead flows in a way that bypasses the first cover member 150 and the second cover member 170.

[0061] Specifically, the outside air located behind the second cover member 170 flows forward through the gap between the first cover member 150 and the second cover member 170, and then flows to the louver 140. In this way, by complicating the flow path of the outside air introduced into the left rear pillar 22L (louver 140), it is possible to suppress the intrusion of foreign matter such as snow and dust.

[0062] Furthermore, the outside air that has flowed into the louvers 140 passes between the upper and lower blades 142 shown in Figure 8. At this time, the outside air flows upward to the right along the shape of the blades 142. By guiding the outside air upward in this way, even if foreign matter (snow, dust, etc.) flows along with the outside air up to the louvers 140, the flow of the foreign matter can be impeded, making it difficult for the foreign matter to pass through the louvers 140. This makes it possible to prevent the filter 120 from becoming clogged with foreign matter.

[0063] In particular, since the blades 142 of this embodiment are formed with the upper bent portions 142c and the lower bent portions 142b, it is possible to complicate the flow path of the outside air passing through the louvers 140. This makes it difficult for foreign objects to pass through the louvers 140.

[0064] As described above, the upper end of the louver 140 is covered from above by the protrusion 133 of the filter housing portion 130. With this configuration, even if water splashes on the upper surface of the filter housing portion 130 during a car wash or the like of the tractor 1, the water can fall to the left of the gap (the left wall portion 141c in this embodiment) to prevent the water from entering the gap between the support portion 141 and the introduction surface 131. This makes it possible to prevent water from adhering to the filter 120 through the gap during a car wash or the like.

[0065] Note that the louvers 140 only need to be able to block the passage of foreign matter, and the configuration of the louvers 140 is not limited to that of the present embodiment. For example, in the present embodiment, the blades 142 of the louvers 140 are formed with the lower bent portion 142b and the upper bent portion 142c, but this is not limited thereto, and at least one of the lower bent portion 142b and the upper bent portion 142c may not be formed. This simplifies the configuration of the blades 142. Furthermore, while the support portion 141 is fixed to the filter housing portion 130, this is not limited thereto, and the support portion 141 may be fixed to another member (for example, the first cover member 150, etc.).

[0066] Next, the structure of the roof 30 will be described.

[0067] 9, the roof 30 includes an inner roof 31, an outer roof 32, and a sealing member 33. The roof 30 (inner roof 31) also houses devices such as an air conditioning unit 330. First, the configuration of the inner roof 31 will be described.

[0068] The inner roof 31 is formed in a generally rectangular shape in plan view, and has approximately the same size as the frame formed by the front beams 23, rear beams 24, etc. The inner roof 31 has a hollow cross section, and is filled with a heat insulating material (for example, foam beads 31a) inside (FIGS. 13 and 14).

[0069] A plurality of recesses are formed on the upper surface of the inner roof 31. As shown in Figures 10 to 12, the recesses form an introduction section 210, a first guide section 220, an air conditioner housing section 230, and a second guide section 240 in the inner roof 31. Note that Figure 12 shows a schematic representation of the shape of the inner roof 31 for the purpose of explanation.

[0070] The introduction section 210 is formed in the left rear part of the inner roof 31. More specifically, the introduction section 210 is formed rearward of the front-to-rear center of the inner roof 31 in the front-to-rear direction. The introduction section 210 is also formed so as to extend from near the left end of the inner roof 31 to near the left-to-right center in the left-to-right direction. An outside air introduction port 211 and an inside air introduction port 212 are formed in the introduction section 210 so as to vertically penetrate the inner roof 31.

[0071] The outside air inlet 211 is formed at the left rear of the introduction section 210. The outside air inlet 211 is connected to the upper end of the left rear pillar 22L. Thus, the outside air guided by the left rear pillar 22L is introduced into the introduction section 210 through the outside air inlet 211.

[0072] The inside air inlet 212 is formed to the right front of the outside air inlet 211. The inside air inlet 212 is formed so as to open to the interior space of the cabin 10. As a result, the inside air of the cabin 10 is introduced into the introduction section 210 through the inside air inlet 212.

[0073] 10 and 12 is formed so as to extend in the front-to-rear direction in the approximate left-to-right center portion of the inner roof 31. The rear end of the first guide portion 220 is connected to the right end of the lead-in portion 210. The front end of the first guide portion 220 is connected to the air conditioner housing portion 230, which will be described later. The first guide portion 220 is formed so that its left-to-right width gradually increases from the rear to the front.

[0074] The air conditioner housing 230 shown in Figure 12 is formed in the front part of the inner roof 31. More specifically, the air conditioner housing 230 is formed forward of the center between the front and rear of the inner roof 31 in the front-to-rear direction. The air conditioner housing 230 is formed to extend from near the left end to near the right end of the inner roof 31. The front end of the first guide part 220 is connected to the center between the left and right of the rear end of the air conditioner housing 230. An air outlet 231 is formed in the air conditioner housing 230 so as to penetrate the inner roof 31 in the vertical direction.

[0075] The air outlets 231 are formed at both left and right ends of the air conditioner housing 230. The air outlets 231 are formed so as to open to the interior space of the cabin 10. As a result, conditioned air from an air conditioning unit 330 (described later) is blown out into the interior of the cabin 10 through the air outlets 231.

[0076] The second guide portions 240 shown in Figures 10 and 12 are formed on both the left and right sides of the first guide portion 220. The second guide portions 240 are connected to both the left and right ends of the air conditioner housing portion 230. The second guide portions 240 are formed to extend rearward from the air conditioner housing portion 230. An air outlet 241 is formed in the second guide portion 240 so as to vertically penetrate the inner roof 31.

[0077] Two air outlets 241 are formed in each of the left and right second guide portions 240. The air outlets 241 are formed to open to the interior space of the cabin 10. As a result, conditioned air from an air conditioning unit 330 (described later) is blown into the interior of the cabin 10 through the air outlets 241.

[0078] 3, the inner roof 31 configured in this manner 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 31b such as bolts.

[0079] 12 and 14, some of the fasteners 31b for fixing the inner roof 31 to the cabin frame 20 are provided inside recesses formed in the inner roof 31. For example, FIGS. 12 and 14 show a fastener 31b provided inside the left second guide portion 240. The fastener 31b is located in front of the second guide portion 240.

[0080] In this way, by arranging the fasteners 31b inside the recesses rather than avoiding the recesses, it is possible to effectively utilize the internal space of the roof 30. Specifically, since the fasteners 31b need to be fixed to the upper part of the cabin frame 20 (the front beam 23, the rear beam 24, the left side beam 25L, and the right side beam 25R), they are provided in positions that overlap the front beam 23, etc. in a plan view. By arranging the fasteners 31b inside the recesses, the recesses can be formed outward beyond the fasteners 31b.

[0081] 10 and 12, cover members are fixed to the upper surface of the inner roof 31. Specifically, a first cover member 250 is fixed to the first guide portion 220 of the inner roof 31, and a second cover member 270 is fixed to the second guide portion 240. The first cover member 250 and the second cover member 270 will be described below.

[0082] The first cover member 250 shown in Figures 11 and 13 is for covering the first guide portion 220. The first cover member 250 is formed to have a shape that is slightly larger than the first guide portion 220 in a plan view. The first cover member 250 is made of, for example, resin. As shown in Figures 13 and 15(a), the first cover member 250 includes a main body portion 251, a contact portion 252, a first rib 253, an attachment portion 254, and a second rib 255.

[0083] The main body 251 is formed in a generally U-shape in a front view, bulging upward. The main body 251 is formed to conform to the shape of the second guide portion 240 in a plan view (the width of the main body 251 gradually increases from the rear to the front). The main body 251 is formed so that the front and rear portions are open.

[0084] The abutment portion 252 is a portion that abuts against a first seal member 260, which will be described later. The abutment portion 252 protrudes outward to the left and right from the lower end of the main body portion 251. The abutment portion 252 is formed from the front end to the rear end of the main body portion 251. The abutment portion 252 is also formed on both the left and right ends of the main body portion 251.

[0085] The first ribs 253 protrude upward from the left and right outer ends of the abutting portion 252. The first ribs 253 are formed from the front end to the rear end of the abutting portion 252. The first ribs 253 are formed on each of the left and right abutting portions 252. The first ribs 253 can reinforce the abutting portions 252.

[0086] The mounting portion 254 is formed in a flat plate shape with its plate surface facing up and down. The mounting portion 254 is formed on the left and right outer sides of the first rib 253. The mounting portion 254 is formed on both the left and right sides of the main body portion 251. Furthermore, multiple left and right mounting portions 254 are formed in the front-rear direction.

[0087] The second ribs 255 protrude upward from the front and rear ends of the mounting portions 254. The second ribs 255 are formed on each of the multiple mounting portions 254. The second ribs 255 can reinforce the mounting portions 254.

[0088] As shown in Figure 13, a first seal member 260 is disposed between the first cover member 250 and the inner roof 31. The first seal member 260 serves to seal the gap between the first guide portion 220 and the first cover member 250. The first seal member 260 is made of an elastically deformable material (e.g., rubber). The first seal member 260 is formed in a longitudinal shape that follows the abutment portion 252. The first seal members 260 are provided on both the left and right sides of the first guide portion 220.

[0089] The first cover member 250 is fixed to the inner roof 31 by attaching fasteners 254a (bolts or the like) to the attachment portions 254 with the first seal member 260 disposed between the first cover member 250 and the inner roof 31. In this manner, in this embodiment, the first guide portion 220 is covered with the first cover member 250 to form the duct 300. Hereinafter, the duct 300 formed by the first guide portion 220 and the first cover member 250 will be referred to as the "first duct 301."

[0090] When the first cover member 250 is fixed to the inner roof 31, the first seal member 260 is elastically deformed between the abutting portion 252 and the inner roof 31. This allows the first seal member 260 to seal between the abutting portion 252 and the inner roof 31, thereby preventing air leakage. Furthermore, the first cover member 250 is formed with the first rib 253 and the second rib 255, which can prevent the abutting portion 252 and the mounting portion 254 from being deformed by the restoring force of the first seal member 260, etc.

[0091] The second cover member 270 shown in Figures 10 and 11 is for covering the second guide portion 240. The second cover member 270 is formed to have a shape that is slightly larger than the second guide portion 240 in a plan view. The second cover member 270 is made of, for example, resin. A pair of second cover members 270 is provided, one on the left and one on the right. The configuration of the second cover member 270 will be described below using the left second cover member 270 shown in Figures 14 and 15(b) as an example. The second cover member 270 includes a main body portion 271, a contact portion 272, a first rib 273, an attachment portion 274, a second rib 275, an opening 276, and an opening / closing portion 277.

[0092] The main body portion 271 is formed in a concave shape that bulges upward. The main body portion 271 is formed to follow the shape of the second guide portion 240 in a plan view. A heat insulating material 280 is provided on the upper surface of the main body portion 271. The heat insulating material 280 is formed to cover the entire main body portion 271 except for an opening 276, which will be described later. The abutting portion 272, the second rib 275, the mounting portion 274, and the second rib 275 are configured in the same manner as the abutting portion 252 of the first cover member 250, etc.

[0093] 14 is a portion that connects the space inside the duct 300 (described later) with the space outside the duct 300. The opening 276 is formed in the left front portion of the main body 271. The opening 276 is formed in a circular shape and passes through the main body 271. The shape of the opening 276 is not limited to the circular shape of this embodiment and can be changed as desired.

[0094] The opening / closing portion 277 shown in Figures 14 and 15(b) is a portion for opening and closing the opening 276. The opening / closing portion 277 is made of, for example, an elastically deformable material (e.g., rubber). The opening / closing portion 277 is formed in a disk shape with an outer diameter larger than the opening 276. As shown in Figure 14, a groove 277a that can engage with the opening 276 is formed on the outer periphery of the opening / closing portion 277. The opening / closing portion 277 can close the opening 276 by engaging the groove 277a with the opening 276.

[0095] Similar to the first cover member 250, a second seal member 290 is disposed between the second cover member 270 and the inner roof 31. The second seal member 290 is made of an elastically deformable material (e.g., rubber). The second seal member 290 is formed in a longitudinal direction along the abutment portion 272.

[0096] The second cover member 270 is fixed to the inner roof 31 by attaching a fastener such as a bolt to the attachment portion 274 with the second seal member 290 disposed between the second cover member 270 and the inner roof 31. In this manner, in this embodiment, the second guide portion 240 is covered with the second cover member 270 to form the duct 300. Hereinafter, the duct 300 formed by the second guide portion 240 and the second cover member 270 will be referred to as the "second duct 302."

[0097] When the second cover member 270 is fixed to the inner roof 31, the second seal member 290 is elastically deformed between the abutting portion 272 and the inner roof 31. This allows the second seal member 290 to seal between the abutting portion 272 and the inner roof 31, thereby suppressing air leakage.

[0098] Furthermore, when the second cover member 270 is fixed to the inner roof 31, the opening 276 is located above the fastener 31b arranged inside the second guide part 240. The opening 276 is opened by removing the opening / closing part 277. This allows the fastener 31b to be attached and detached through the opening 276, thereby improving workability.

[0099] The position of the opening 276 is not limited to this embodiment as long as it is a position (a position corresponding to the fastener 31b) that allows the fastener 31b to be attached and detached through the opening 276. For example, the opening 276 may be disposed at a position that is horizontally offset from the fastener 31b in a plan view to an extent that the fastener 31b can be attached and detached with a tool.

[0100] Next, a description will be given of the equipment housed in the roof 30. As shown in Fig. 11, the roof 30 houses an inside / outside air switching mechanism 310, a blower 320, an air conditioning unit 330, and a guide member 340.

[0101] The inside / outside air switching mechanism 310 switches the air introduced into the roof 30 between outside air and inside air by opening and closing the outside air inlet 211 formed in the introduction section 210. The configuration of the inside / outside air switching mechanism 310 is not particularly limited. The inside / outside air switching mechanism 310 can open and close the outside air inlet 211 by, for example, rotating a plate-shaped member having approximately the same size as the outside air inlet 211 using a drive source such as a motor.

[0102] Blower 320 is a device for sending air into air conditioning unit 330. Blower 320 is disposed on the right side of introduction section 210 (near the connection with first guide section 220). Blower 320 can send air from introduction section 210 toward first duct 301.

[0103] 11 and 12 is a device for performing air conditioning. The air conditioning unit 330 is disposed in the center of the left and right of the air conditioning housing portion 230. An air inlet of the air conditioning unit 330 is connected to the first duct 301.

[0104] The guide member 340 guides the air conditioned by the air conditioning unit 330 to the second guide portion 240. The guide member 340 is arranged on both the left and right sides of the air conditioning unit 330 inside the air conditioning housing portion 230. The guide member 340 is formed in a cylindrical shape. One end of the guide member 340 is connected to air outlets (not shown) formed on the left and right side surfaces of the air conditioning unit 330. The other end of the guide member 340 is connected to the second duct 302. The bottom surface of the guide member 340 is connected to the air outlet 231 formed in the air conditioning housing portion 230.

[0105] As shown in Fig. 3, an outer roof 32 is provided on top of the inner roof 31 configured in this manner. The outer roof 32 closes the inner roof 31 from above.

[0106] In this embodiment, an example in which a recess is formed on the upper surface of the inner roof 31 is shown, but the present invention is not limited to this. For example, a recess may be formed on the lower surface of the outer roof 32 instead of the upper surface of the inner roof 31.

[0107] Next, the state of air circulation in the roof 30 configured as described above will be described.

[0108] To condition the interior of the cabin 10, the blower 320 and the air conditioning unit 330 are operated. As shown in Fig. 12 , the blower 320 sends air from the intake section 210 to the first duct 301. Accordingly, air is introduced into the intake section 210 from the outside air intake port 211 or the inside air intake port 212. The inside / outside air switching mechanism 310 can select whether air is introduced from the outside air intake port 211 or the inside air intake port 212.

[0109] The air introduced into the introduction section 210 is sent to the air conditioning unit 330 via the first duct 301. As described above, the first duct 301 is formed by closing the first guide section 220 (recess) with the first cover member 250. By forming the majority of the first duct 301 (excluding the upper part) in the inner roof 31 in this way, it is not necessary to provide a separate cylindrical duct, and the configuration of the first duct 301 can be simplified.

[0110] The air sent to the air conditioning unit 330 is conditioned (temperature adjusted, etc.) by the air conditioning unit 330. The air conditioned by the air conditioning unit 330 is sent to the second duct 302 via a guide member 340 (see FIG. 11 ).

[0111] The air flowing through the guide member 340 is blown out from the middle of the guide member 340 through the outlet 231 into the interior of the cabin 10. In addition, the air sent into the second duct 302 through the guide member 340 is blown out into the interior of the cabin 10 through the outlet 241. This allows the interior of the cabin 10 to be air-conditioned.

[0112] As described above, the second duct 302 is formed by closing the second guide portion 240 (recess) with the second cover member 270. By forming the majority of the second duct 302 (excluding the upper portion) in this way in the inner roof 31, the configuration of the second duct 302 can be simplified.

[0113] The inner roof 31 is filled with a heat-insulating material (foam beads 31a shown in FIG. 14 ). The second cover member 270 is provided with a heat insulating material 280. By covering the outside of the second duct 302 with the heat insulating material 280 or the like in this manner, it is possible to prevent condensation from forming in the second duct 302 due to the conditioned air from the air conditioning unit 330.

[0114] The configuration for suppressing the occurrence of condensation in the second cover member 270 is not limited to the present embodiment. For example, the occurrence of condensation can be suppressed by making the second cover member 270 out of a heat insulating material (such as foamed resin).

[0115] In addition, in this embodiment, the first guide portion 220 and the second guide portion 240 are covered by the first cover member 250, etc., but the cover member is not limited to the first guide portion 220, etc., and can also cover other portions (such as the introduction portion 210).

[0116] Next, the configuration of the outer roof 32 will be described.

[0117] The outer roof 32 shown in Figures 9 and 16 is formed in a generally 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 upper surface of the outer roof 32 is formed so as to slope gently downward from the front-rear midpoint toward the front-rear outer sides. The upper surface of the outer roof 32 is also formed so as to slope gently downward from the left-right midpoint toward the left-right outer sides. The outer roof 32 has a recess 32a and a guide portion 32b.

[0118] The recesses 32a shown in Figures 17 and 18 are recessed portions in the upper surface of the outer roof 32. The recesses 32a are formed so that their bottom surfaces face upward. A plurality of recesses 32a are formed. The plurality of recesses 32a are arranged along the outer edge of the outer roof 32 (see Figure 16).

[0119] The guide portion 32b is for guiding water. The guide portion 32b is formed to be recessed in the upper surface of the outer roof 32. The depth of the guide portion 32b is deeper than the recessed portion 32a. The guide portion 32b has a first portion 32c and a second portion 32d.

[0120] The first portion 32c shown in Figure 16 is formed so as to extend in the left-right direction. The first portion 32c is formed at each of the front and rear ends of the outer roof 32. The first portion 32c is formed from the left to right portion of the outer roof 32. The first portion 32c is formed so as to follow the shape of the upper surface of the outer roof 32. More specifically, the first portion 32c is formed so as to slope gently downward from the left-right midpoint of the outer roof 32 toward the left and right outer sides. This enables the second portion 32d to guide water toward the left and right outer sides of the outer roof 32.

[0121] The second portions 32d are formed to extend in the front-to-rear direction. The second portions 32d are formed at both left and right ends and a left and right midpoint of the outer roof 32. The (left and right) second portions 32d located at both left and right ends are formed from the front end surface to the rear end surface of the outer roof 32. The left and right second portions 32d are connected to both left and right ends of the first portion 32c. The second portion 32d located at the left and right midpoint extends rearward from the front-to-rear midpoint of the outer roof 32 and is connected to the rear first portion 32c.

[0122] The second portions 32d are formed to follow the shape of the upper surface of the outer roof 32. More specifically, the second portions 32d are formed to gently slope downward from the midpoint between the front and rear of the outer roof 32 toward the front and rear outer sides. This enables the second portions 32d to guide water toward the front and rear outer sides of the outer roof 32. In addition, water can be discharged (dropped) from both the front and rear ends of the left and right second portions 32d. This enables the guide portions 32b to prevent water from accumulating on the upper surface of the outer roof 32.

[0123] The recess 32a is connected to either the front end surface or the guide portion 32b of the outer roof 32. This allows water in the recess 32a to be discharged via the front end surface or the guide portion 32b. Furthermore, the guide portion 32b is deeper than the recess 32a (the bottom surface of the recess 32a is located higher than the bottom surface of the guide portion 32b), which facilitates water flow from the recess 32a to the guide portion 32b (see FIG. 18). This effectively prevents water from accumulating in the recess 32a.

[0124] As shown in Fig. 9 , a seal member 33 is provided between the outer roof 32 and inner roof 31 configured as described above. The seal member 33 serves to seal the gap between the outer roof 32 and the inner roof 31. The seal member 33 is made of an elastically deformable material (e.g., rubber). The seal member 33 is formed in a generally rectangular ring shape in plan view that fits along the outer edge of the outer roof 32. The air conditioning unit 330 and the blower 320 are disposed inside the seal member 33 in plan view (see Fig. 16 ).

[0125] 18 , the outer roof 32 is fixed to the inner roof 31 by fasteners 34 such as bolts, with a seal member 33 disposed between the outer roof 32 and the inner roof 31. The seal member 33 is elastically deformed between the outer roof 32 and the inner roof 31. The seal member 33 seals the gap between the outer roof 32 and the inner roof 31.

[0126] 16, the fasteners 34 are arranged along the outer edge of the outer roof 32 (the outer edge of the cabin 10 in a plan view). By attaching the fasteners 34 to the recesses 32a in this way, the fasteners 34 can be made less visible from outside the cabin 10, thereby improving the aesthetic appearance.

[0127] 19 , the fasteners 34 are disposed further outward than the seal member 33 in a plan view. Specifically, the fasteners 34 are disposed closer to the outer edge of the outer roof 32 (horizontally outward) than the seal member 33 in a plan view. The fasteners 34 are disposed in a range R32 between the outer edge of the outer roof 32 and the seal member 33 in a plan view.

[0128] With this configuration, even if water seeps into the roof 30 between the outer roof 32 and the fasteners 34, the water can be prevented from entering the inside of the roof 30 (the inside of the sealing member 33 in a plan view). This makes it possible to prevent malfunctions in devices (such as the air conditioning unit 330) located inside the sealing member 33.

[0129] Here, a straight line L34 shown in the enlarged portion of FIG. 19 is a straight line connecting two adjacent fasteners 34 along the outer edge of the outer roof 32. The seal member 33 of this embodiment is arranged to pass over this straight line L34. With this configuration, the seal member 33 can be firmly fixed by the two adjacent fasteners 34. This configuration will be described below using the left front portion of the seal member 33 shown in FIG. 19 as an example. Furthermore, this configuration will be described below by assigning the names of the first portion 33a and the second portion 33b to the respective portions of the left front portion of the seal member 33.

[0130] The first portion 33a is formed outside the straight line L34 in the horizontal direction (toward the outer edge of the outer roof 32). The first portion 33a shown in Figure 19 is formed outside the straight line L34 so as to follow the outer edge of the outer roof 32.

[0131] At least a portion of the second portion 33b is formed horizontally inward of the fastener 34. The second portion 33b is formed to be continuous with the first portion 33a so as to connect adjacent first portions 33a. The second portion 33b bends from the inside of the fastener 34 so as to bypass the fastener 34. The second portion 33b shown in FIG. 19 is formed in an arc shape in a plan view.

[0132] The seal member 33 is positioned so that the first portion 33a and the second portion 33b cross (pass) the line L34. Positioning a portion of the seal member 33 on the line L34 in this manner allows the seal member 33 to be firmly fixed. The restoring force of the seal member 33 also prevents the outer roof 32 from deforming (deforming upward to open the roof 30). While the first portion 33a is formed outside the line L34 in the above embodiment, this configuration is not limited thereto, and the first portion 33a may also be formed on the line L34. For example, the first portion 33a may be formed so as to overlap the line L34 (extend along the line L34) in a plan view. In this manner, the seal member 33 can be firmly fixed even when the seal member 33 is positioned without crossing the line L34 in a plan view.

[0133] For convenience of explanation, the left front portion of the sealing member 33 (enlarged portion in FIG. 19) has been taken as an example, but other portions of the sealing member 33 (e.g., the right front portion, rear portion, etc.) are also disposed so as to pass through the straight line L34. This allows the sealing member 33 to be firmly fixed at multiple locations.

[0134] The seal member 33 only needs to be able to seal between the inner roof 31 and the outer roof 32, and the configuration of the seal member 33 is not limited to that of this embodiment. For example, the shape of the seal member 33 in a plan view is not limited to a rectangular ring shape, and can be changed as appropriate depending on the arrangement of the equipment (such as the air conditioning unit 330) inside the roof 30 and the shape of the outer roof 32. Furthermore, although the seal member 33 is shown in FIG. 19 to pass along the straight line L34, it is also possible to arrange the seal member 33 so that it does not pass through the straight line L34 depending on the arrangement of the fasteners 34, etc.

[0135] As described above, the conditioned air from the air conditioning unit 330 is blown into the cabin 10 through the air outlets 231 and 241 (see FIG. 12). The conditioned air is directed against the door 40 to heat it, thereby melting snow adhering to the door 40.

[0136] In this embodiment, the rear portion of the door 40 is heated not only by conditioned air but also by the heating wire 440. This effectively melts snow adhering to the rear portion of the door 40, ensuring visibility behind the door 40. The following describes the configuration of the heating wire 440 and its surroundings. Specifically, the configurations of the door 40, door damper 410, first bus bar 420, second bus bar 430, heating wire 440, first fixing member 450, second fixing member 460, and harness 470 shown in Figures 20 to 22 will be described.

[0137] The doors 40 and the like are provided on both the left and right sides of the cabin 10. Since the left and right doors 40 and the like are configured symmetrically, the following will describe the configuration of the doors 40 and the like using the left door 40 and the like as an example. For the sake of convenience, the harness 470 is omitted from Fig. 20 and Fig. 21. For the sake of convenience, the heating wire 440 is omitted from Fig. 22.

[0138] The door 40 has a panel 41 made of glass. The panel 41 is formed in a generally plate-like shape and is approximately the same size as the entrance (left and right sides) of the cabin 10. A door seal member 41a is provided along the entire outer edge of the panel 41. The panel 41 is rotatably supported on the left rear pillar 22L via the pair of upper and lower hinges 42 (see FIG. 4 ) described above. The fixing portions 42b of the hinges 42 are fixed to the rear end of the panel 41. More specifically, the fixing portion 42b of the upper hinge 42 is fixed to the rear upper end of the panel 41. The fixing portion 42b of the lower hinge 42 is fixed to the rear lower end of the panel 41.

[0139] 20 , a handrail 43 is provided on the inner surface of the panel 41 to be grasped by a passenger when opening or closing the door 40 from the inside. The handrail 43 is formed of a rod-shaped metal member. The rear end of the handrail 43 is fixed to the fixing portion 42b of the lower hinge 42. The front end of the handrail 43 is fixed to the front lower portion of the panel 41.

[0140] The door damper 410 biases the door 40. The door damper 410 is provided between the panel 41 and the left side beam 25L (see FIG. 3 ). The door damper 410 is extendable and retractable and configured to return to its natural length (maximum extended length). As shown in FIGS. 21 and 22 , the door damper 410 includes a cylinder tube 411, which is a cylindrical member filled with gas, and a piston rod 412, which is a substantially cylindrical member housed inside the cylinder tube 411. The piston rod 412 is biased in a direction that protrudes relative to the cylinder tube 411 (the direction in which the door damper 410 extends) by receiving pressure from the gas inside the cylinder tube 411.

[0141] The cylinder tube 411 is disposed facing substantially in the front-to-rear direction. The piston rod 412 is disposed so as to protrude rearward relative to the cylinder tube 411. The tip end (rear end) of the cylinder tube 411 is connected to a stay 413 fixed to the inner fixing portion 42d of the fixing portion 42b so as to be rotatable about a rotation axis that extends substantially in the vertical direction. In this manner, the door damper 410 is attached to the inner fixing portion 42d via the stay 413. The tip end (front end) of the piston rod 412 is connected to the left side beam 25L so as to be rotatable about a rotation axis that extends substantially in the vertical direction.

[0142] For example, when the door 40 is closed, the door damper 410 biases the door 40 in the closing direction. When the door 40 is fully open, the door damper 410 biases the door 40 in the opening direction. Although not shown, the door damper 410 is also provided between the panel 41 and the left side lower frame 27L (below the door damper 410 shown in FIG. 20 ).

[0143] The first bus bar 420 and the second bus bar 430 shown in Figures 20 to 22 are electrodes for passing electricity through the heating wire 440. The first bus bar 420 is formed in a longitudinal shape extending vertically. The first bus bar 420 is fixed to the rear end of the inner surface of the panel 41 and is disposed between a pair of upper and lower hinges 42 (inner fixing portions 42d) in the vertical direction. The upper end of the first bus bar 420 is connected to a harness 470 (described later) via a first terminal 421.

[0144] The second bus bar 430 is fixed to the upper rear end of the panel 41. The second bus bar 430 is formed in an elongated shape and is arranged so as to be inclined upward toward the front. The rear end of the second bus bar 430 is connected to a harness 470 (described later) via a second terminal 431.

[0145] 20 and 21 is for heating the panel 41. A plurality of heating wires 440 are provided on the inner surface of the panel 41. One end of the heating wire 440 is connected to the first bus bar 420. The other end of the heating wire 440 is connected to the second bus bar 430. The middle portion of the heating wire 440 is bent as appropriate so as not to interfere with other heating wires 440.

[0146] The heating wire 440 is disposed at the rear of the panel 41. Specifically, the heating wire 440 is disposed rearward of the center of the panel 41 in the front-to-rear direction. In this embodiment, the heating wire 440 is disposed rearward of a reference position that is preset with respect to the seat 11. This reference position is a seat reference point P11 (Seat Index Point: SIP). The seat reference point P11 refers to a reference point on the seat 11 that is defined near the joint between the theoretical occupant's torso and thighs. Note that the reference position is not limited to this embodiment (seat reference point P11), and a position other than the seat reference point P11 may also be used as the reference position.

[0147] The heating wire 440 generates heat when electricity is applied between the first bus bar 420 and the second bus bar 430. This heats up the rear of the panel 41, melting snow and removing frost and fogging that has adhered to the panel 41. This prevents the visibility behind the door 40 from becoming poor.

[0148] Furthermore, the heating wire 440 is disposed above the handrail 43. This allows the heating wire 440 to be disposed at an appropriate position (at a height close to the face of the passenger seated in the seat 11), effectively preventing snow and the like from blocking the passenger's view.

[0149] The heating wire 440 may be any wire arranged at the rear of the panel 41, and the configuration of the heating wire 440 is not limited to that of the present embodiment. For example, a single heating wire 440 may be used to heat the rear of the door 40. The heating wire 440 may also be used to heat the area below the handrail 43.

[0150] 21 and 22 is for fixing the harness 470 to the left rear pillar 22L. The first fixing member 450 is formed in a generally L-shape in side view. The first fixing member 450 is fixed to the upper end of the front surface of the left rear pillar 22L (at a position higher than the first bus bar 420).

[0151] The second fixing member 460 is for fixing the harness 470 to the inner fixing portion 42d. The second fixing member 460 is formed in a generally flat plate shape with its plate surface facing generally upward. The second fixing member 460 is fixed to the inner fixing portion 42d and is arranged so as to protrude from the inner fixing portion 42d to the left and right inside of the cabin 10. The second fixing member 460 is arranged lower than the first fixing member 450 in a side view.

[0152] The harness 470 shown in Fig. 22 connects the power source and the heating wire 440 (enabling current to flow between the first bus bar 420 and the second bus bar 430). The harness 470 is formed between the power source and the first bus bar 420 and the second bus bar 430. The harness 470 is formed in a longitudinal (linear) shape and is flexible. Fig. 22 shows the end of the harness 470 on the heating wire 440 side when the door 40 is closed.

[0153] In this embodiment, the harness 470 (the end on the heating wire 440 side) is fixed to the first fixing member 450 and the second fixing member 460, and is thereby bent when the door 40 is closed. This makes it possible to reduce the installation space. Below, the respective portions of the harness 470 when the door 40 is closed are named a first extending portion 471, a second extending portion 472, a bending portion 473, a third extending portion 474, and a branching portion 475, and the fixing and arrangement of the harness 470 will be specifically described.

[0154] The harness 470 (the end on the heating wire 440 side) extends downward along the front side surface of the left rear pillar 22L (see first extending portion 471). The harness 470 also extends forward from the lower end of the first extending portion 471 and passes above the first fixing member 450 (see second extending portion 472). The second extending portion 472 is fixed to the left rear pillar 22L via the first fixing member 450. Fixing the harness 470 near the pivot point of the door 40 in this manner prevents the harness 470 from moving significantly when the door 40 is opened or closed, thereby preventing the harness 470 from breaking.

[0155] The harness 470 also bends from the front end of the second extending portion 472 so as to fold back toward the left rear pillar 22L (rearward), and then bends toward the second fixing member 460 (to the left) (see bent portion 473). The harness 470 also extends leftward from the bent portion 473 and passes below the second fixing member 460 (see third extending portion 474). The third extending portion 474 is fixed to the inner fixing portion 42d of the hinge 42 (door 40) via the second fixing member 460. By fixing the heating wire 440 side relative to the second extending portion 472 in this manner, it is possible to effectively prevent the harness 470 from moving significantly when the door 40 is opened or closed.

[0156] The harness 470 is also formed so as to branch into two at the left end of the third extending portion 474 (see branch portion 475). One of the branches 475 is connected to the first bus bar 420 via the first terminal 421. The other of the branches 475 is connected to the second bus bar 430 via the second terminal 431.

[0157] Although not shown, the end of the harness 470 on the heating wire 440 side is covered with a flexible cover member. For example, the second extending portion 472 and the bent portion 473 are covered with the cover member. This protects the harness 470.

[0158] As described above, the cabin 10 for a 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, a sealing member 33 that seals between the inner roof 31 and the outer roof 32, and fasteners 34 (fixing members) that are positioned outside the sealing member 33 in a plan view and that secure the inner roof 31 and the outer roof 32 to each other (see Figure 16).

[0159] With this configuration, the gap between the inner roof 31 and the outer roof 32 can be effectively sealed.

[0160] The sealing member 33 is formed in an annular shape in a plan view.

[0161] With this configuration, it is possible to prevent water from flowing inside the seal member 33 .

[0162] A plurality of fasteners 34 are provided, and the seal member 33 is disposed so as to pass on a line connecting two adjacent fasteners 34 (see FIG. 19).

[0163] With this configuration, the seal member 33 can be firmly fixed.

[0164] The plurality of fasteners 34 are provided along the outer edge of the cabin 10 (see FIG. 16).

[0165] By configuring it in this manner, the inner roof 31 and the outer roof 32 can be fixed along the outer edge of the cabin 10.

[0166] The fastener 34 is attached to a recess 32a formed in the upper surface of the outer roof 32 (see FIG. 18).

[0167] By configuring it in this way, the fastener 34 can be made less visible.

[0168] The outer roof 32 is also provided with a guide portion 32b that is formed to be recessed on the upper surface and is connected to the recess 32a to guide water.

[0169] This configuration allows water to be discharged from the recess 32a to the guide portion 32b, thereby preventing water from accumulating in the recess 32a.

[0170] The recess 32a is located at a higher position than the guide portion 32b.

[0171] This configuration effectively prevents water from accumulating in the recess 32a.

[0172] The fastener 34 according to this embodiment is one embodiment of a fixing member.

[0173] As described above, the cabin 10 for a 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, a first guide portion 220 and a second guide portion 240 (recesses) that are formed on either the upper surface of the inner roof 31 or the lower surface of the outer roof 32, and a first cover member 250 and a second cover member 270 (cover members) that cover the first guide portion 220 and the second guide portion 240 to form a duct 300, which is an air circulation path, between the first guide portion 220 and the second guide portion 240 (see Figure 11).

[0174] By configuring in this way, it is possible to prevent the structure of the duct 300 from becoming complicated, and to simplify the structure.

[0175] In addition, an air conditioning unit 330 for conditioning the interior of the cabin 10 and a blower 320 for sucking air and sending it to the air conditioning unit 330 are housed between the inner roof 31 and the outer roof 32, and a first duct 301 (the duct 300) is formed between the air conditioning unit 330 and the blower 320 to allow air to flow.

[0176] With this configuration, air can be guided from the blower 320 to the air conditioning unit 330 with a simple configuration.

[0177] In addition, an air conditioning unit 330 for conditioning the interior of the cabin 10 is housed between the inner roof 31 and the outer roof 32, and an air outlet 241 that opens into the interior of the cabin 10 is formed in the inner roof 31, and a second duct 302 (the duct 300) is formed to allow air to flow between the air conditioning unit 330 and the air outlet 241.

[0178] By configuring in this manner, air can be guided from the air conditioning unit 330 to the air outlet 241 with a simple configuration.

[0179] The second cover member 270 is provided with a heat insulating material 280 (see FIG. 15(b)).

[0180] By configuring in this way, it is possible to suppress the occurrence of condensation.

[0181] The second cover member 270 is made of a heat insulating material.

[0182] By configuring in this way, it is possible to suppress the occurrence of condensation.

[0183] In addition, the first guide portion 220 and the second guide portion 240 are formed on the upper surface of the inner roof 31, and the inner roof 31 is filled with foam beads 31a (a material having insulating properties) (see Figures 13 and 14).

[0184] By configuring in this way, it is possible to suppress the occurrence of condensation.

[0185] The cabin 10 further includes a sealing member that seals between the recess and the cover member. In this embodiment, as examples of the sealing member, a first sealing member 260 that seals between the first guide portion 220 and the first cover member 250, and a second sealing member 290 that seals between the second guide portion 240 and the second cover member 270 are described.

[0186] With this configuration, air leakage between the first guide portion 220 and the first cover member 250 and between the second guide portion 240 and the second cover member 270 can be suppressed.

[0187] In addition, the first cover member 250 and the second cover member 270 are provided with abutment portions 252, 272 that abut against the first seal member 260 and the second seal member 290, and first ribs 253, 273 that reinforce the abutment portions 252, 272.

[0188] With this configuration, deformation of the first cover member 250 and the second cover member 270 (contact portions 252, 272) can be suppressed.

[0189] In addition, the cabin 10 further includes fasteners 254a (first fixing members) that fix the first cover member 250 and the second cover member 270 to either the inner roof 31 or the outer roof 32, and the cover members include mounting portions 254 and 274 to which the fasteners 254a are attached, and second ribs 255 and 275 that reinforce the mounting portions 254 and 274.

[0190] By configuring in this manner, deformation of the first cover member 250 and the second cover member 270 (the attachment portions 254, 274) can be suppressed.

[0191] In addition, the second guide portion 240 accommodates a fastener 31b (second fixing member) that fixes the inner roof 31 to the cabin frame 20, and the second cover member 270 has an opening 276 formed at a position corresponding to the fastener 31b, and an opening / closing portion 277 that can open and close the opening 276 (see Figure 14).

[0192] With this configuration, the fastener 31b can be attached and detached through the opening 276, thereby improving workability.

[0193] The first guide portion 220 and the second guide portion 240 according to this embodiment are one embodiment of a recess. The first cover member 250 and the second cover member 270 according to this embodiment are one embodiment of a cover member. The first seal member 260 and the second seal member 290 according to this embodiment are one embodiment of a seal member. The fastener 254a according to this embodiment is one embodiment of a first fixing member. The fastener 31b according to this embodiment is one embodiment of a second fixing member.

[0194] As described above, the cabin 10 for the work vehicle according to this embodiment has a panel 41 made of glass, a door 40 for opening and closing the entrance and exit of the cabin 10, and an electric heating wire 440 capable of heating the rear of the panel 41 (see Figure 20).

[0195] By configuring in this manner, it is possible to prevent the visibility behind the door 40 from being reduced.

[0196] In addition, the cabin 10 is provided with a seat 11 inside the cabin 10 for passengers to sit on, and the heating wire 440 is provided behind a predetermined reference position relative to the seat 11.

[0197] By configuring in this manner, it is possible to prevent the visibility of the door 40 from being reduced to the rear of the reference position of the seat 11 (to the rear in a side view).

[0198] The reference position is the seat reference point P11.

[0199] By configuring in this manner, it is possible to prevent the visibility of the door 40 from being reduced behind the seat reference point P11 (rearward in a side view).

[0200] The cabin 10 further includes a left rear pillar 22L and a right rear pillar 22R (pillars) that support the door 40 so that it can be opened and closed, a harness 470 that connects a power source and the heating wire 440, and a first fixing member 450 that fixes the harness 470 to the left rear pillar 22L and the right rear pillar 22R (see Figure 22).

[0201] This configuration can prevent the harness 470 from moving too much when the door 40 is opened or closed, and can prevent the harness 470 from breaking.

[0202] The cabin 10 further includes a second fixing member 460 that fixes the heating wire 440 side of the harness 470 to the door 40 relative to the portion fixed by the first fixing member 450 .

[0203] By configuring in this manner, it is possible to effectively prevent the harness 470 from moving significantly when the door 40 is opened or closed.

[0204] The cabin 10 further includes a hinge 42 having a fixing portion 42b (inner fixing portion 42d) fixed to the rear end of the door 40 and a pivot shaft 42a that rotatably supports the fixing portion 42b relative to the left rear pillar 22L, and the second fixing member 460 is attached to the fixing portion 42b of the hinge 42 (see Figures 4 and 21).

[0205] With this configuration, the second fixing member 460 can be fixed to the door 40 using the fixing portion 42b of the hinge 42, thereby simplifying the configuration.

[0206] A door damper 410 is attached to the fixed portion 42b.

[0207] With this configuration, the door damper 410 can be attached using the fixing portion 42b of the hinge 42, thereby simplifying the configuration.

[0208] The cabin 10 further includes a four-poster cabin frame 20.

[0209] By configuring in this manner, it is possible to prevent the visibility behind the door 40 provided on the four-poster cabin frame 20 from being reduced.

[0210] The left rear pillar 22L and the right rear pillar 22R according to this embodiment are examples of pillars.

[0211] As described above, the cabin 10 for a work vehicle according to this embodiment is a cabin 10 for a work vehicle having a roof 30 on which a duct 300 for guiding air is formed, and is equipped with a left rear pillar 22L (rear pillar) provided at the rear of the cabin 10 and capable of guiding outside air to the roof 30, a filter 120 that purifies the outside air introduced into the left rear pillar 22L, a filter housing portion 130 that houses the filter 120, and a louver 140 that is positioned on the outside of the vehicle relative to the filter housing portion 130 and is provided to obstruct the flow of foreign matter (see FIG. 5).

[0212] By configuring in this manner, it is possible to prevent the filter 120 from being clogged with foreign matter.

[0213] The louver 140 is provided with blades 142 that extend upward from the outside of the room toward the inside of the room (see FIG. 8).

[0214] This configuration makes it difficult for foreign matter to pass through the blades 142, and prevents foreign matter from clogging the filter 120. In addition, a plurality of blades 142 are provided, and are arranged so that at least a portion of each blade overlaps with another blade when viewed from the outside of the room.

[0215] By configuring in this manner, it is possible to effectively prevent the filter 120 from being clogged with foreign matter.

[0216] In addition, the blade 142 has a main body portion 142a that extends upward as it moves from the outside of the room to the inside of the room, and an upper bent portion 142c that is formed so as to bend upward from the end of the main body portion 142a on the inside of the room.

[0217] By configuring in this manner, it is possible to effectively prevent the filter 120 from being clogged with foreign matter.

[0218] In addition, the blade 142 has a main body portion 142a that extends upward as it moves from the outside of the room to the inside of the room, and a lower bent portion 142b that is formed so as to bend downward from the outside end of the main body portion 142a.

[0219] By configuring in this manner, it is possible to effectively prevent the filter 120 from being clogged with foreign matter.

[0220] The louver 140 further includes a support portion 141 that supports the blades 142 and is attached to the filter housing portion 130 .

[0221] With this configuration, the louver 140 can be installed using the filter housing portion 130, thereby simplifying the configuration.

[0222] The filter housing portion 130 is formed with a protrusion 133 (cover portion) that covers the upper end of the support portion 141 from above.

[0223] This configuration can prevent water from adhering to the filter 120 through the gap between the upper end of the support portion 141 and the filter housing portion 130 .

[0224] The left rear pillar 22L according to this embodiment is an embodiment of a rear pillar, and the protrusion 133 according to this embodiment is an embodiment of a cover.

[0225] 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.

[0226] 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.

[0227] Furthermore, the configuration (shape, size, number, etc.) of each member described in the above embodiment is not limited and can be changed as desired.

[0228] Furthermore, in this embodiment, a configuration has been described in which outside air is introduced into the roof 30 through the left rear pillar 22L, but the present invention is not limited to this. For example, a configuration in which outside air is introduced into the roof 30 through the right rear pillar 22R may also be adopted. Furthermore, a configuration in which air flows not only through the rear pillars (the left rear pillar 22L and the right rear pillar 22R), but also through other members that constitute the cabin frame 20 (for example, the left front pillar 21L, the right front pillar 21R, etc.).

[0229] The arrangement of the various devices within the roof 30 is not limited and can be changed as desired. For example, the air conditioning unit 330 can be arranged at the rear of the roof 30. The blower 320 and the air conditioning unit 330 can also be arranged adjacent to each other (or directly connected).

[0230] The present invention can be applied to a cabin for a work vehicle.

[0231] REFERENCE SIGNS LIST 1 Tractor 10 Cabin 22L Left rear pillar 31 Inner roof 32 Outer roof 32b Recess 33 Sealing member 34 Fastener 40 Door 41 Panel 120 Filter 130 Filter housing 140 Louver 150 First cover member 170 Second cover member 300 Duct 440 Heating wire

Claims

1. A cabin for a work vehicle having a roof formed with a duct for guiding air, a rear pillar provided at a rear portion of the cabin and capable of guiding outside air to the roof, a filter for purifying the outside air introduced into the rear pillar, a filter housing portion for housing the filter, a louver disposed outside the filter housing portion on the outdoor side and provided to inhibit the flow of foreign matter, The cabin for a work vehicle is provided.

2. The louver includes a blade formed to extend upward as it goes from the outdoor side to the indoor side. The cabin for a work vehicle according to claim 1.

3. A plurality of the blades are provided and arranged such that at least a part of them overlaps with each other when viewed from the outdoor side. The cabin for a work vehicle according to claim 2.

4. The blade includes a main body portion that extends upward as it goes from the outdoor side to the indoor side, and an upper bent portion formed to bend upward from an end portion on the indoor side of the main body portion. The cabin for a work vehicle according to claim 2.

5. The blade includes a main body portion that extends upward as it goes from the outdoor side to the indoor side, and a lower bent portion formed to bend downward from an end portion on the outdoor side of the main body portion. The cabin for a work vehicle according to claim 3 or claim 4.

6. The louver further includes a support portion that supports the blade and is attached to the filter housing portion. The cabin for a work vehicle according to claim 2 or claim 3.

7. A cover portion that covers an upper end portion of the support portion from above is formed in the filter housing portion. The cabin for a work vehicle according to claim 6.

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