Cabin for working vehicle

Abstract

Provided is a cabin for a work vehicle in which the noise inside the cabin can be reduced.　A cabin 10 for a tractor 1 includes: an inner roof 31 constituting a ceiling of a cabin interior; and an outer roof 32 provided above the inner roof 31. A resonator 120 having a recessed shape and capable of reducing noise in the cabin interior is formed on at least one of the upper surface of the inner roof 31 or the lower surface of the outer roof 32.

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] The cabin described in Patent Document 1 can form an interior space in which a driver's seat is located by providing a front panel, a rear panel, and door panels to a cabin frame that forms the framework of the cabin.

[0004] In such a closed room, noise (muffled noise) may be generated when a work vehicle is operated, and technology to reduce this noise is needed.

[0005] Japanese Patent Application Laid-Open No. 2022-145820

[0006] One aspect of the present disclosure has been made in consideration of the above-described circumstances, and the problem it aims to solve is to provide a cabin for a work vehicle that is capable of reducing noise inside the cabin.

[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] A cabin for a work vehicle according to one aspect of the present disclosure is a cabin for a work vehicle comprising an inner roof that forms the ceiling inside the cabin, and an outer roof that is provided above the inner roof, and at least one of the upper surface of the inner roof or the lower surface of the outer roof has a concave resonator formed thereon that can reduce noise inside the cabin.

[0009] In one aspect of the present disclosure, at least one of the upper surface of the inner roof or the lower surface of the outer roof has a concave duct formed thereon to guide air flowing out from the cabin interior, and the resonator is formed in the middle of the duct.At least one of the upper surface of the inner roof or the lower surface of the outer roof has a concave duct formed thereon to guide air flowing out from the cabin interior, and the resonator is formed in the middle of the duct.

[0010] A cabin for a work vehicle according to one embodiment of the present disclosure further includes a straightening mechanism in the middle of the duct that allows air to flow out of the cabin in a first direction and inhibits air from flowing back into the cabin in a second direction.

[0011] The straightening mechanism according to one aspect of the present disclosure includes a partition member that partitions the duct, and an elastic member that is arranged to block an opening formed in the partition member and that opens the opening as air flows in the first direction.

[0012] In one embodiment of the present disclosure, the inner roof has a recess formed in a position facing the interior of the cabin, and a through hole formed in the recess so as to connect the interior of the cabin with the resonator.

[0013] A cabin for a work vehicle according to one aspect of the present disclosure further includes a cover member arranged to cover the through-hole from the inside of the cabin.

[0014] The resonator according to one aspect of the present disclosure is formed at the rear of the inner roof or the outer roof.

[0015] According to one aspect of the present disclosure, noise inside the cabin can be reduced.

[0016] 14. A 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 front perspective view showing the inside of the roof. A rear perspective view showing the left rear part of the cabin. An exploded rear perspective view showing the structure around the left rear pillar. A plan sectional view at the middle part between the top and bottom of the left rear pillar, showing the structure around the left rear pillar. A front perspective view showing a first cover member. A rear view showing the upper left part of the cabin. A front perspective view showing the inner roof. A plan view showing the inner roof. A plan view showing a schematic diagram of the shape of the inner roof. A bottom sectional view showing the interior of the cabin. A plan view showing the inside of the roof. A cross-sectional view taken along the X-X line in FIG. 14. A rear perspective view showing the inside of the roof and an inside / outside air switching mechanism. A rear sectional view showing a state in which the outside air inlet is closed by the inside / outside air switching mechanism. A rear sectional view showing a state in which the outside air inlet is opened by the inside / outside air switching mechanism. (a) A schematic rear cross-sectional view showing a state in which the outside air inlet is opened by another example of the inside / outside air switching mechanism. (b) A schematic rear cross-sectional view showing a state in which the inside air inlet is opened by another example of the inside / outside air switching mechanism. A front perspective view showing a resonator and a rectifying mechanism. A front exploded perspective view showing the resonator and the rectifying mechanism. A plan cross-sectional view showing the resonator and the rectifying mechanism. A side view showing the upper part of the cabin. A Y-Y cross-sectional view in FIG. 14. A front perspective view showing the mounting structure of a work light.

[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 the driver is formed inside the cabin 10. A seat 11 for the driver to sit in is arranged in the interior space. A steering wheel 12 for adjusting the turning angle of the front wheels 6 is also arranged 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, 3 and 4, the cabin 10 mainly includes a cabin frame 20, a roof 30, a door 41, a rear panel 42, a front panel 43, 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] 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.

[0029] 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.

[0030] 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 for placing the seat 11 is provided behind the step 28 at a position higher than the step 28.

[0031] The roof 30 is provided on the upper part of the cabin frame 20 and covers the seats 11 from above. The roof 30 mainly includes an inner roof 31 and an outer roof 32.

[0032] 3 and 4 is fixed to the upper part of the cabin frame 20 and constitutes the ceiling inside the cabin 10. An air conditioning unit 92 (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.

[0033] As shown in Fig. 2, doors 41 are provided on the left and right side portions of the cabin frame 20 in an openable and closable manner. A rear panel 42 is provided on the rear portion of the cabin frame 20 in an openable and closable manner. As shown in Fig. 4, a front panel 43 is provided on the front portion of the cabin frame 20. In this manner, an interior space is formed in the cabin 10 that is surrounded by the roof 30, the doors 41, the rear panel 42, and the front panel 43.

[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. 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 92 in the roof 30 conditions the air inside the roof 30. The air conditioned by the air conditioning unit 92 is blown out into the cabin. In addition, if the pressure inside the cabin increases, for example, when the door 41 of the cabin 10 is closed, the air inside the cabin can be exhausted to the outside through the roof 30 and the right rear pillar 22R, thereby suppressing the increase in pressure inside the cabin. Below, the structures related to the air flow as described above will be described in order.

[0035] First, the structure around the left rear pillar 22L for introducing outside air into the interior of the roof 30 will be described.

[0036] 5, 6, and 7, the left rear pillar 22L is provided with a pair of upper and lower door support portions 51. A pair of upper and lower hinge portions 41a provided on the door 41 are rotatably connected to the pair of upper and lower door support portions 51, thereby attaching the door 41 to the left rear pillar 22L. The left rear pillar 22L is also provided with a filter housing portion 62 that houses a filter 61 that purifies outside air. The left rear pillar 22L is also provided with a first cover member 63 and a second cover member 64 that cover the filter housing portion 62.

[0037] As shown in Figures 6 and 7, the left rear pillar 22L is formed in a longitudinal shape extending vertically. 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 52 that communicate between the interior and exterior of the left rear pillar 22L. The illustration shows an example in which four rectangular openings 52 are formed in a vertical row on the left side surface of the left rear pillar 22L. The left rear pillar 22L can introduce outside air through the openings 52. 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] The filter housing portion 62 is formed in a generally rectangular parallelepiped shape that is long vertically and hollow. The right side of the filter housing portion 62 is open. The left side (inlet surface 62a) of the filter housing portion 62 is formed in a mesh shape with many small openings 62b. Air can flow through the openings 62b in a direction perpendicular to the inlet surface 62a. This allows air to flow from the outside to the inside of the filter housing portion 62 via the inlet surface 62a of the filter housing portion 62. A generally rectangular parallelepiped filter 61 that is long vertically is housed inside the filter housing portion 62. The filter 61 can remove dust particles contained in the air and purify the air.

[0039] The filter housing portion 62 is fixed to the left rear pillar 22L with the filter 61 housed therein. At this time, the filter housing portion 62 is positioned so that the opening 52 formed in the left side surface of the left rear pillar 22L is entirely covered by the filter housing portion 62.

[0040] As shown in Figures 5, 6, 7, and 8, the first cover member 63 is formed in a longitudinal shape extending vertically. The first cover member 63 is formed, for example, from a resin material. The vertical length of the first cover member 63 is formed to be approximately the same as the vertical length of the left rear pillar 22L. The first cover member 63 is formed in a concave shape that is open toward the front.

[0041] An extension 63a is formed in the vertical midpoint of the first cover member 63 (the portion located between the pair of upper and lower hinge portions 41a of the door 41). The extension 63a is formed so as to extend forward from the left end of the first cover member 63. The front end of the extension 63a is bent outward on the left and right (to the left).

[0042] A guide surface 63b is formed on the first cover member 63. The guide surface 63b is formed so as to extend forward from the right end portion of the first cover member 63. The guide surface 63b is formed so as to follow the outer edge shape of the rear panel 42 in rear view. For example, as shown in FIG. 9 , the corners of the rear panel 42 are formed in an R-shape, and the guide surface 63b of the first cover member 63 is formed so as to follow the R-shape of the rear panel 42. As shown in FIG. 7 , the guide surface 63b is formed so as to be slightly inclined toward the center of the rear panel 42 as it extends forward.

[0043] A rear combination lamp 63c, which integrates multiple lamps such as brake lamps and turn signal lamps, is provided on the rear surface of the first cover member 63. In addition, a lifting operation device 63d (see FIG. 5, etc.) that allows a driver outside the vehicle to raise and lower the lifting device 9 (see FIG. 1) is provided on the rear surface of the first cover member 63 (below the rear combination lamp 63c). The lifting operation device 63d can be configured, for example, as a push button.

[0044] 7 , the first cover member 63 is arranged so that the rear portion of the filter accommodating portion 62 is located inside the first cover member 63. This allows the first cover member 63 to cover and conceal the rear portion of the filter accommodating portion 62 (the rear surface of the filter accommodating portion 62 and the rear portion of the introduction surface 62a) from the exterior side (rear side) of the cabin 10. The first cover member 63 (extension portion 63a) is arranged so that a predetermined gap is left between the first cover member 63 and the introduction surface 62a of the filter accommodating portion 62.

[0045] 5, 6, and 7, the second cover member 64 is formed in a longitudinal shape extending vertically. The second cover member 64 is formed of a material (e.g., a metal material) different from that of the first cover member 63. The vertical length of the second cover member 64 is formed to be approximately the same as the distance between the pair of upper and lower hinge portions 41a of the door 41. The second cover member 64 is formed in a substantially rectangular plate shape with the plate surface facing in the left-right direction.

[0046] The second cover member 64 is disposed between a pair of upper and lower hinge portions 41a of the door 41. As shown in FIG. 7 , the rear portion of the second cover member 64 is disposed so as to overlap the extending portion 63a of the first cover member 63 in the left-right direction. The front end of the second cover member 64 is disposed so as to be located forward of the front end of the filter accommodating portion 62. The front end of the second cover member 64 is also disposed so as to be located forward of the rear end of the door 41. This allows the second cover member 64 to conceal the front portion of the filter accommodating portion 62 (the front surface and the introduction surface 62a of the filter accommodating portion 62) from the exterior side (left side) of the cabin 10. The second cover member 64 is disposed so as to leave a predetermined gap between the first cover member 63 (extending portion 63a), the filter accommodating portion 62, and the door 41.

[0047] In this way, the filter accommodating portion 62 is covered from the rear and left side by the first cover member 63 and the second cover member 64. In particular, the inlet surface 62 a of the filter accommodating portion 62 is covered by the first cover member 63 and the second cover member 64 so as not to be exposed to the outside when viewed from the flow direction of the air flowing through the inlet surface 62 a (i.e., the direction perpendicular to the inlet surface 62 a).

[0048] As shown in FIG. 7, the openable door 41 and the rear panel 42 are provided with a door seal member 41b and a rear panel seal member 42b for sealing the cabin 10.

[0049] The door seal member 41b is provided along the entire outer edge of the door 41. The door seal member 41b has a double lip structure that contacts two opposing surfaces to seal gaps between the two surfaces and the door 41. Specifically, with reference to the cross section shown in FIG. 7 , the door seal member 41b includes a main lip 41c that seals against the cabin frame 20 (left rear pillar 22L) and a sub-lip 41d that seals against the filter housing portion 62. By sealing against the two opposing surfaces in this manner, the door seal member 41b can effectively prevent water, wind, dust, and the like from entering the interior space of the cabin 10 from the outside.

[0050] In particular, in this embodiment, the second cover member 64 covers and conceals the door seal member 41b at the rear end of the door 41 from the left side. This prevents high-pressure water from being directly hit on the door seal member 41b when washing a car, wind, rain, and the like from the left side, and more effectively prevents water and the like from entering the cabin 10.

[0051] The rear panel seal member 42b is provided over the entire outer edge of the rear panel 42. The cross-sectional shape of the rear panel seal member 42b is generally similar to that of the door seal member 41b. Specific description will be given with reference to the cross section shown in Figure 7 , and the rear panel seal member 42b includes a main lip 42c that provides a seal between the rear panel seal member 42b and the cabin frame 20 (left rear pillar 22L) and a sub-lip 42d that provides a seal between the rear panel seal member 42b and the first cover member 63 (guide surface 63b).

[0052] As described above, the guide surface 63b of the first cover member 63 is formed to follow the R-shape of the rear panel 42 (see FIG. 9 ). Therefore, when closing the rear panel 42, the sub-lip 42d of the rear panel seal member 42b contacts the guide surface 63b and is guided to fit into the outer edge shape of the rear panel 42. By guiding the rear panel seal member 42b with the guide surface 63b of the first cover member 63 in this manner, unintended deformation of the rear panel seal member 42b, which bends to follow the outer edge shape of the rear panel 42, can be prevented, and the sealing performance of the rear panel 42 can be ensured.

[0053] The manner in which outside air is introduced through the left rear pillar 22L configured as above will be described with reference to FIG.

[0054] When air is sucked in by a blower 91 disposed inside the roof 30 (described later), outside air is introduced through an opening 52 in the left rear pillar 22L, and the outside air flows upward inside the left rear pillar 22L and is guided to the roof 30. The outside air flows through the gap between the first cover member 63 and the second cover member 64 to the filter housing portion 62, where it is filtered by the filter 61 housed in the filter housing portion 62 before being introduced into the left rear pillar 22L.

[0055] Here, the first cover member 63 and the second cover member 64 are arranged in the direction in which the inlet surface 62a of the filter accommodating section 62 faces (a direction perpendicular to the inlet surface 62a), so that the outside air does not flow vertically toward the inlet surface 62a of the filter accommodating section 62, but instead flows in a way that bypasses the first cover member 63 and the second cover member 64.

[0056] Specifically, outside air located in front of the second cover member 64 flows rearward through the gap between the second cover member 64 and the door 41, and then flows from the inlet surface 62a of the filter housing portion 62 into the filter housing portion 62. Meanwhile, outside air located behind the second cover member 64 flows forward through the gap between the extension portion 63a of the first cover member 63 and the second cover member 64, and then flows around the extension portion 63a and from the inlet surface 62a of the filter housing portion 62 into the filter housing portion 62. In this way, by complicating the flow path of the outside air introduced into the left rear pillar 22L (filter housing portion 62), it is possible to suppress the intrusion of external water, etc.

[0057] Although detailed description will be omitted, the structure around the right rear pillar 22R is configured to be approximately symmetrical to the structure around the left rear pillar 22L. However, since the air inside the cabin 10 is exhausted to the outside through the right rear pillar 22R but outside air is not introduced into the cabin, there is no need to provide the filter 61 and filter housing 62 provided on the left rear pillar 22L on the right rear pillar 22R.

[0058] Next, the structure of the roof 30 will be described.

[0059] 3 and 4 , the roof 30 includes an inner roof 31 and an outer roof 32. A duct 70 is formed inside the roof 30 to guide air circulating into the cabin 10 or air flowing out from the cabin to the outside. The roof 30 (inner roof 31) also houses devices such as an air conditioning unit 92. First, the configuration of the inner roof 31 will be described.

[0060] 10 and 11 show the inner roof 31 alone (excluding the air conditioning unit 92 and other devices housed in the inner roof 31). For the sake of explanation, Fig. 12 shows a schematic diagram of the shape of the inner roof 31. In Figs. 11 and 12, the upper beams (front beam 23, rear beam 24, left side beam 25L, and right side beam 25R) are shown with dashed lines to show the relative positional relationship between the inner roof 31 and the upper beams.

[0061] A duct 70 capable of guiding air is formed on the upper surface of the inner roof 31. In this embodiment, the duct 70 is formed mainly by the upper surface of the inner roof 31, which is formed in a concave shape. The duct 70 mainly includes an inlet portion 71, a first guide portion 72, an air conditioner housing portion 73, a second guide portion 74, an outlet portion 75, etc.

[0062] The introduction section 71 is formed in the left rear of the inner roof 31. More specifically, the introduction section 71 is formed rearward of the front-to-rear center of the inner roof 31 in the front-to-rear direction. The introduction section 71 is also formed 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 71a and an inside air introduction port 71b are formed in the introduction section 71 so as to vertically penetrate the inner roof 31.

[0063] The outside air inlet 71a is formed in the left rear portion of the introduction portion 71. The outside air inlet 71a is connected to the upper end of the left rear pillar 22L. As a result, the outside air guided by the left rear pillar 22L is introduced into the duct 70 (introduction portion 71) through the outside air inlet 71a.

[0064] The inside air inlet 71b is formed to the right front of the outside air inlet 71a. The inside air inlet 71b is formed so as to open to the interior space of the cabin 10 (see FIG. 13). As a result, the inside air of the cabin 10 is introduced into the duct 70 (introduction portion 71) through the inside air inlet 71b.

[0065] The first guide portion 72 is formed to extend in the front-to-rear direction in approximately the left-to-right center portion of the inner roof 31. The rear end of the first guide portion 72 is connected to the right end of the introduction portion 71. The front end of the first guide portion 72 is connected to an air conditioner housing portion 73, which will be described later. The first guide portion 72 is formed so that its left-to-right width gradually increases from the rear to the front.

[0066] The air conditioner housing 73 is formed in the front part of the inner roof 31. More specifically, the air conditioner housing 73 is formed forward of the front-to-rear center of the inner roof 31 in the front-to-rear direction. The air conditioner housing 73 is also 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 72 is connected to the left-to-right center of the rear end of the air conditioner housing 73. An air outlet 73a is formed in the air conditioner housing 73 so as to penetrate the inner roof 31 in the vertical direction.

[0067] The air outlets 73a are formed at both left and right ends of the air conditioner housing 73. The air outlets 73a are formed to open to the interior space of the cabin 10 (see FIG. 13 ). As a result, conditioned air from an air conditioning unit 92 (described later) is blown into the interior of the cabin 10 through the air outlets 73a.

[0068] The second guide portions 74 are formed on both the left and right sides of the first guide portion 72. The second guide portions 74 are connected to both the left and right ends of the air conditioner housing portion 73. The second guide portions 74 are formed to extend rearward from the air conditioner housing portion 73. An air outlet 74a is formed in the second guide portion 74 so as to vertically penetrate the inner roof 31.

[0069] Two air outlets 74a are formed in each of the left and right second guide portions 74. The air outlets 74a are formed to open to the interior space of the cabin 10 (see FIG. 13 ). As a result, conditioned air from an air conditioning unit 92 (described later) is blown into the interior of the cabin 10 through the air outlets 74a.

[0070] The discharge portion 75 is formed in the right rear portion of the inner roof 31. More specifically, the discharge portion 75 is formed rearward of the front-to-rear center of the inner roof 31 in the front-to-rear direction. The discharge portion 75 is also formed to extend from near the right end of the inner roof 31 to near the left-to-right center (near the inlet portion 71) in the left-to-right direction. In this embodiment, the discharge portion 75 constitutes a resonator 120 for reducing noise inside the cabin 10. An inside air inlet 75a and an inside air outlet 75b are formed in the discharge portion 75 so as to vertically penetrate the inner roof 31.

[0071] The inside air inlet 75a is formed on the left side of the exhaust portion 75. The inside air inlet 75a is formed so as to open to the interior space of the cabin 10 (see FIG. 13 ). As a result, the inside air of the cabin 10 is introduced into the duct 70 (exhaust portion 75) through the inside air inlet 75a.

[0072] The inside air exhaust port 75b is formed in the right part of the exhaust portion 75. The inside air exhaust port 75b is connected to the upper end of the right rear pillar 22R. This allows the inside air introduced into the exhaust portion 75 via the inside air inlet 75a to be exhausted to the outside via the inside air exhaust port 75b and the right rear pillar 22R.

[0073] The resonator 120 formed by the exhaust section 75 will be described in detail later.

[0074] The upper surface of the inner roof 31 is formed with a first concave wiring housing 76 and a second concave wiring housing 77 for arranging wiring and the like.

[0075] The first wiring accommodating portion 76 is formed in the left-right direction between the first guide portion 72 and the left-side second guide portion 74. The first wiring accommodating portion 76 is formed to extend in the front-rear direction and is formed to connect the introduction portion 71 and the air conditioner accommodating portion 73. A seal member 76a is disposed at the front end of the first wiring accommodating portion 76, which blocks air flowing back and forth through the first wiring accommodating portion 76.

[0076] The second wiring housing 77 is formed in the left-right direction between the first guide portion 72 and the right-side second guide portion 74. The second wiring housing 77 is formed to extend in the front-rear direction and is formed to connect the exhaust portion 75 and the air conditioner housing portion 73. A seal member 77a is arranged at the front end of the second wiring housing 77, which blocks air flowing back and forth through the second wiring housing 77.

[0077] Appropriate wiring and the like can be arranged from front to back in the first wiring housing portion 76 and the second wiring housing portion 77. In this case, the sealing members 76a and 77a prevent unnecessary air flow, thereby preventing poor air flow and condensation caused by cold air from the air conditioning unit 92, which will be described later.

[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 such as bolts.

[0079] 11 and 15, among the fasteners for fixing the inner roof 31 to the cabin frame 20, some fasteners 31a are provided inside the duct 70 formed in the inner roof 31. For example, FIG. 15 shows the fastener 31a provided inside the second guide portion 74 on the left side.

[0080] In this way, by arranging the fasteners 31a inside the duct 70 rather than arranging them to avoid the duct 70, it is possible to effectively utilize the internal space of the roof 30. Specifically, the fasteners 31a 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), and therefore are provided in positions that overlap the front beam 23, etc. in a plan view. By arranging the fasteners 31a inside the duct 70, the duct 70 can be formed to extend outside the fasteners 31a (see FIG. 15 ).

[0081] Furthermore, in this embodiment, a portion of the duct 70 is formed to be located outside the front beam 23, etc., thereby more effectively utilizing the interior space of the roof 30. For example, in this embodiment, as shown in FIGS. 11 and 12 , a portion of the inlet portion 71 and the outlet portion 75 is formed to protrude outside (rearward of) the rear beam 24 in a plan view. Note that the shape of the duct 70 is not limited to this, and any portion of the duct 70 can be formed to be located outside the front beam 23, etc. Furthermore, in addition to the duct 70, it is also possible to form the arrangement space for various devices (e.g., a blower 91, an air conditioning unit 92, etc.) to be located outside the cabin frame 20 (front beam 23, etc.).

[0082] Next, a description will be given of the equipment housed in the roof 30. As shown in Figures 4 and 14, the roof 30 houses an inside / outside air switching mechanism 100, a blower 91, an air conditioning unit 92, and a guide member 93.

[0083] 14 and 16 switches the air introduced into the roof 30 between outside air and inside air by opening and closing the outside air inlet 71a formed in the inlet portion 71. The specific configuration of the inside / outside air switching mechanism 100 will be described later.

[0084] 4 and 14 is a device for sending air to the air conditioning unit 92. The blower 91 is disposed on the right side of the introduction section 71 (near the connection with the first guide section 72). The blower 91 can send air from the introduction section 71 toward the first guide section 72.

[0085] The air conditioning unit 92 is a device for performing air conditioning. The air conditioning unit 92 is disposed in the center of the left and right of the air conditioning housing portion 73. An air inlet 92 a of the air conditioning unit 92 is disposed so as to face the front end portion of the first guide portion 72.

[0086] The guide member 93 guides the air conditioned by the air conditioning unit 92 to the second guide portion 74. The guide members 93 are arranged on both the left and right sides of the air conditioning unit 92 inside the air conditioning housing portion 73. The guide members 93 are formed in a cylindrical shape. One end of the guide member 93 is connected to air outlets (not shown) formed on the left and right side surfaces of the air conditioning unit 92. The other end of the guide member 93 is arranged to face the front end of the second guide portion 74. The bottom surface of the guide member 93 is connected to the air outlet 73a formed in the air conditioning housing portion 73.

[0087] 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 duct 70 formed in the inner roof 31 from above. A seal member is appropriately arranged on the outer edge of the duct 70 to prevent air from leaking from the gap between the inner roof 31 and the outer roof 32.

[0088] In this embodiment, an example has been shown in which the concave duct 70 is formed on the upper surface of the inner roof 31, but the present invention is not limited to this. For example, it is also possible to form the concave duct on the lower surface of the outer roof 32 instead of the upper surface of the inner roof 31, or to form the concave duct on both the upper surface of the inner roof 31 and the lower surface of the outer roof 32.

[0089] 13, the lower surface of the inner roof 31 forms the interior ceiling of the cabin 10. Therefore, it is desirable to provide a decorative material such as a nonwoven fabric on the lower surface of the inner roof 31 (particularly, the portion located inside the cabin 10).

[0090] The cabin 10 is also provided with cover members that cover the cabin frame 20 from the inside. Specifically, the cover members include a left front pillar cover 94L that covers the left front pillar 21L, a right front pillar cover 94R that covers the right front pillar 21R, a left rear pillar cover 95L that covers the left rear pillar 22L, a right rear pillar cover 95R that covers the right rear pillar 22R, a front beam cover 96 that covers the front beam 23, a rear beam cover 97 that covers the rear beam 24, a left side beam cover 98L that covers the left side beam 25L, and a right side beam cover 98R that covers the right side beam 25R. Each cover member is formed of, for example, resin. Covering the cabin frame 20 with each cover member can improve the aesthetic appearance of the interior of the cabin 10.

[0091] Appropriate components can be arranged inside each cover member. For example, as shown in FIG. 7, a drain hose 95a for an air conditioning unit 92, wiring 95b for electrical components, and the like can be arranged between the left rear pillar 22L and a left rear pillar cover 95L that covers the left rear pillar 22L, as needed. Various devices can also be provided on each cover member. For example, operating tools for operating the air conditioning unit 92 can be provided.

[0092] Next, the state of air circulation in the roof 30 configured as described above will be described.

[0093] To condition the interior of the cabin 10, the blower 91 and the air conditioning unit 92 are operated. As shown in Fig. 12, the blower 91 sends air from the introduction section 71 to the first guide section 72. Accordingly, air is introduced into the introduction section 71 from the outside air introduction port 71a or the inside air introduction port 71b. Whether air is introduced from the outside air introduction port 71a or the inside air introduction port 71b can be selected by the inside / outside air switching mechanism 100, which will be described later.

[0094] The air introduced into the introduction section 71 is sent to the air conditioning unit 92 via the first guide section 72. The air sent to the air conditioning unit 92 is conditioned (temperature adjusted, etc.) by the air conditioning unit 92. The air conditioned by the air conditioning unit 92 is sent to the second guide section 74 via a guide member 93 (see FIG. 14, etc.).

[0095] The air flowing through the guide member 93 is blown out from the middle of the guide member 93 through the air outlet 73a into the interior of the cabin 10. In addition, the air sent to the second guide portion 74 through the guide member 93 is blown out through the air outlet 74a into the interior of the cabin 10. This allows the interior of the cabin 10 to be air-conditioned.

[0096] Furthermore, the resonator 120 formed by the exhaust portion 75 can reduce noise inside the cabin 10. Furthermore, if the pressure inside the cabin 10 increases when closing the door 41, for example, the air inside the cabin 10 can be exhausted to the outside via the exhaust portion 75. Specifically, the air inside the cabin 10 that is introduced into the exhaust portion 75 via the inside air inlet 75a can be exhausted to the outside of the cabin 10 via the inside air exhaust port 75b. This suppresses an increase in pressure inside the cabin 10, making it easier to close the door 41 and the rear panel 42.

[0097] Next, the inside / outside air switching mechanism 100 provided in the introduction section 71 will be described.

[0098] 16 and 17, the inside / outside air switching mechanism 100 opens and closes the outside air inlet 71a. The inside / outside air switching mechanism 100 mainly includes a base plate 101, an opening / closing member 102, a rotating shaft 103, a sealing member 104, a motor 105, an arm 106, and a connecting shaft 107.

[0099] The base plate 101 is formed in a generally flat plate shape. An opening 101a is formed in the center of the base plate 101, penetrating the base plate 101 from top to bottom. The base plate 101 is disposed so that the opening 101a communicates with the outside air inlet 71a, and is fixed to the first guide portion 72. A support portion 101b is provided on the left side of the base plate 101 for rotatably supporting the opening / closing member 102. The support portion 101b is formed in a generally U-shape in side view, with both front and rear end portions of the plate-like member bent upward.

[0100] The opening / closing member 102 is formed in a substantially flat plate shape. The opening / closing member 102 is arranged to cover the opening 101a of the base plate 101 from above. A first connecting portion 102a for connecting to the base plate 101 is erected on the left side of the opening / closing member 102. A rotation shaft 103 is inserted through the first connecting portion 102a and the support portion 101b. This allows the opening / closing member 102 to rotate relatively to the base plate 101 around the rotation shaft 103. A second connecting portion 102b is erected on the front side of the opening / closing member 102 for connecting to a connecting shaft 107 (described later). A long hole 102c extending in the left-right direction is formed in the second connecting portion 102b.

[0101] A seal member 104 is provided between the base plate 101 and the opening / closing member 102. The seal member 104 is fixed to the upper surface of the base plate 101. The seal member 104 is formed around the entire outer edge of the opening 101a of the base plate 101. The seal member 104 can seal between the base plate 101 and the opening / closing member 102 when the opening / closing member 102 closes the opening 101a.

[0102] A motor 105 is provided in front of the opening / closing member 102. One end of a longitudinal arm 106 is fixed to an output shaft 105a provided on the rear surface of the motor 105. A connecting shaft 107 is provided at the other end of the arm 106 so as to protrude rearward. The connecting shaft 107 is inserted into a long hole 102c of the opening / closing member 102.

[0103] By using the inside / outside air switching mechanism 100 configured in this manner, it is possible to switch between an outside air introduction state in which outside air is introduced and an inside air circulation state in which inside air is circulated when performing air conditioning.

[0104] Specifically, the outside air introduction mode and the inside air circulation mode can be switched using an appropriate operating tool. When the inside air circulation mode is selected using the operating tool, the motor 105 operates to the state shown in FIG. 17 . More specifically, the output shaft 105a of the motor 105 rotates until the connecting shaft 107 is positioned below the output shaft 105a of the motor 105. This causes the open / close member 102 connected to the connecting shaft 107 to rotate downward and press against the seal member 104. In this state, the outside air introduction port 71a is closed, so outside air is not introduced into the introduction portion 71 through the left rear pillar 22L. In the inside air circulation mode, cabin air (inside air) is introduced into the introduction portion 71 through the inside air introduction port 71b shown in FIG. 16 , and the inside air can be conditioned by the air conditioning unit 92.

[0105] On the other hand, when the outside air introduction state is selected by the operating tool, the motor 105 operates to the state shown in FIG. 18 . More specifically, the output shaft 105a rotates until the connecting shaft 107 is positioned above the output shaft 105a of the motor 105. This causes the open / close member 102 connected to the connecting shaft 107 to rotate upward and move away from the seal member 104. In this state, the outside air introduction port 71a is open, allowing outside air to be introduced into the introduction portion 71 through the left rear pillar 22L. The outside air introduced into the introduction portion 71 is conditioned by the air conditioning unit 92 and then blown into the cabin 10.

[0106] In this way, it is possible to switch between the outside air introduction state and the inside air circulation state with a simple configuration by using the inside / outside air switching mechanism 100. Note that the configuration of the inside / outside air switching mechanism 100 described in this embodiment is one example, and the configuration can be changed as desired.

[0107] 19 schematically shows an inside / outside air switching mechanism 110 (another example of the inside / outside air switching mechanism 100) configured to simultaneously open and close not only the outside air inlet 71 a but also the inside air inlet 71 b. The inside / outside air switching mechanism 110 includes an outside air opening / closing member 111 that can open and close the outside air inlet 71 a, an inside air opening / closing member 112 that can open and close the inside air inlet 71 b, a swinging member 113 connected to the outside air opening / closing member 111 and the inside air opening / closing member 112, a motor 114, etc.

[0108] The outside air opening / closing member 111 is supported so as to be rotatable about a pivot shaft 111a provided at the left end, the inside air opening / closing member 112 is supported so as to be rotatable about a pivot shaft 112a provided at the right end, and the swinging member 113 is supported so as to be swingable about a pivot shaft 113a provided at the bottom.

[0109] An elongated hole 113b is formed in the upper part of the swinging member 113. A connecting shaft 114a is inserted into the elongated hole 113b. Similar to the inside / outside air switching mechanism 100 (see FIG. 17 , etc.), the connecting shaft 114a can move in an arc around the output shaft of the motor 114 via an arm (not shown) provided on the motor 114. By moving the connecting shaft 114a with the driving force of the motor 114, the swinging member 113 can be swung left and right.

[0110] A long hole 111b and a long hole 112b are formed in the outside air opening and closing member 111 and the inside air opening and closing member 112. A connecting shaft 113c and a connecting shaft 113d provided at both left and right ends of the swinging member 113 are inserted into the long hole 111b and the long hole 112b, respectively.

[0111] In the inside / outside air switching mechanism 110 configured as described above, when the outside air introduction state is selected, the swinging member 113 swings to the right, as shown in Figure 19(a). The swinging member 113 pushes down the inside air opening / closing member 112, causing the inside air inlet 71b to be closed by the inside air opening / closing member 112. Meanwhile, the outside air opening / closing member 111 is pulled up, opening the outside air inlet 71a. As a result, in the outside air introduction state, outside air can be introduced through the outside air inlet 71a while preventing air (inside air) from flowing into the introduction section 71 from the inside air inlet 71b.

[0112] On the other hand, when the inside air recirculation mode is selected, the swinging member 113 is swung leftward as shown in Figure 19(b). The swinging member 113 pushes down the outside air opening and closing member 111, causing the outside air inlet 71a to be closed by the outside air opening and closing member 111. Meanwhile, the inside air opening and closing member 112 is pulled up, opening the inside air inlet 71b. As a result, in the inside air recirculation mode, inside air can be introduced through the inside air inlet 71b while preventing air (outside air) from flowing into the inlet 71 from the outside air inlet 71a.

[0113] In this way, the inside / outside air switching mechanism 110 can open and close two opening / closing members (outside air opening / closing member 111 and inside air opening / closing member 112) using a single drive source (motor 114), thereby simplifying the configuration.

[0114] Next, the resonator 120 formed by the exhaust section 75 will be described.

[0115] 20, 21, and 22 is intended to reduce noise (muffled noise) inside the cabin 10. The resonator 120 is configured from the left portion (the portion where the inside air inlet 75a is formed) of the exhaust portion 75. The resonator 120 is provided with a cover member 121, a partition member 122, an opening / closing member 123, a sealing member 124, and the like.

[0116] The cover member 121 shown in FIGS. 13 and 22 covers the inside air inlet 75a from the interior side of the cabin 10. A recess 31b is formed on the interior-facing surface of the inner roof 31, recessing the periphery of the inside air inlet 75a. The cover member 121 is arranged to cover a portion of the recess 31b from the interior side of the cabin 10. In this embodiment, the cover member 121 is arranged from the left end to near the right end of the recess 31b (to the right of the right end of the inside air inlet 75a). As a result, most of the recess 31b is blocked by the cover member 121, but the right end of the recess 31b is open to the interior side of the cabin 10. The cover member 121 is arranged to be substantially flush with the underside of the inner roof 31 (the surface surrounding the recess 31b). As a result, the cover member 121 can cover the inside air inlet 75a without impairing the aesthetic appearance of the interior of the cabin 10.

[0117] The partitioning member 122 shown in Figures 20, 21, and 22 is used to partition the exhaust section 75. The partitioning member 122 is formed by bending a flat plate-shaped member to form an upper surface 122a that covers the exhaust section 75 from above and a side surface 122b that divides the exhaust section 75 into left and right sections. The upper surface 122a can cover the left section of the exhaust section 75 from above. The side surface 122b can divide the exhaust section 75 into a left section (a section where the inside air inlet 75a is formed) and a right section (a section where the inside air exhaust port 75b is formed). An opening 122c that penetrates the side surface 122b is formed in the side surface 122b. The partitioning member 122 is positioned to divide the left and right sections of the exhaust section 75 and is fixed to the upper surface of the inner roof 31. Furthermore, a seal member 122d for sealing the gap between the discharge portion 75 and the introduction portion 71 is provided on the upper surface of the partition member 122 (upper surface portion 122a).

[0118] The opening / closing member 123 is a member capable of opening and closing the opening 122c of the partition member 122. The opening / closing member 123 is made of an elastic material such as rubber. The opening / closing member 123 is formed in a flat plate shape that is slightly larger than the opening 122c. The opening / closing member 123 is positioned so as to close the opening 122c from the right side of the side surface portion 122b. The upper end of the opening / closing member 123 is fixed to the side surface portion 122b with an appropriate fastener (e.g., a screw). As a result, when a force (air pressure) greater than or equal to a predetermined value is applied to the opening / closing member 123 toward the right, the opening / closing member 123 elastically deforms, and the lower part of the opening / closing member 123 separates from the side surface portion 122b, opening the opening 122c. On the other hand, when a force toward the left is applied to the opening / closing member 123, the opening / closing member 123 is pressed against the side surface portion 122b, preventing the opening 122c from being opened.

[0119] In this way, the partition member 122 and the opening / closing member 123 form a rectifying mechanism 125 that allows air to flow in only one direction (from left to right).

[0120] The exhaust section 75 (resonator 120) configured in this manner can reduce noise inside the cabin 10. Specifically, sound that has entered the left portion of the exhaust section 75 (inside the partition member 122) from the inside air inlet 75a is resonated inside the partition member 122, causing air friction near the inside air inlet 75a, thereby absorbing the sound energy inside the cabin 10. By appropriately adjusting the volume inside the resonator 120, noise of a specific frequency can be effectively suppressed.

[0121] In this embodiment, the resonator 120 is formed by the recessed discharge portion 75 formed in the inner roof 31, but the present invention is not limited to this. For example, it is also possible to form a recessed resonator on the underside of the outer roof 32, or to form recessed resonators on both the inner roof 31 and the outer roof 32.

[0122] Furthermore, in this embodiment, an example has been shown in which the resonator 120 is formed at the right rear portion of the roof 30, but the present invention is not limited to this, and the resonator 120 can be formed at any position. For example, it can be disposed at the left rear portion of the roof 30 or at the front portion of the roof 30 (forward of the center between the front and rear). In this case, it is desirable to select a position that does not interfere with other ducts 70 so as not to impede the function of the other ducts 70.

[0123] Furthermore, a resonator may be provided separately from the roof 30. For example, as shown in Fig. 1, a lower resonator 13 may be provided behind the seat 11. By appropriately setting the volumes of the resonator 120 provided on the roof 30 and the lower resonator 13 and making the frequencies that each resonator can handle different, noise in the cabin 10 can be reduced more effectively.

[0124] Furthermore, the exhaust portion 75 not only functions as the resonator 120, but also functions as an inside air damper that suppresses an increase in pressure inside the cabin 10. For example, if the pressure inside the cabin 10 increases when the door 41 is closed, the pressure causes the opening / closing member 123 to elastically deform to the right, opening the opening 122c. When the opening 122c is opened, the air inside the cabin 10 is exhausted to the outside via the exhaust portion 75, the inside air exhaust port 75b, and the right rear pillar 22R. This makes it possible to suppress an increase in pressure inside the cabin 10.

[0125] Next, a sealing structure for preventing water from entering the cabin 10 and the roof 30 will be described.

[0126] 15 , a first seal member 130 is provided between the roof 30 and the cabin frame 20 to prevent water from entering the interior of the cabin 10 from the outside. Below, the configuration related to the arrangement of the first seal member 130 will be described using the cross-sectional structure of the middle portion of the left side beam 25L as shown in FIG.

[0127] A concave first seal accommodating portion 131 for accommodating the first seal member 130 is formed in the underside of the inner roof 31. The first seal accommodating portion 131 is formed along the cabin frame 20 on which the inner roof 31 is placed. In other words, the first seal accommodating portion 131 is formed along the left side beam 25L, the front beam 23, the right side beam 25R, and the rear beam 24. As a result, the first seal accommodating portion 131 is formed so as to extend in a generally rectangular ring shape in a plan view.

[0128] The first seal accommodating portion 131 is formed so as to be located inward of the outer edge of the upper surface 132 of the left side beam 25L. That is, the outer edge of the first seal accommodating portion 131 in the width direction (left-right direction in FIG. 15 ) is located inward of the outer edge of the upper surface 132 of the left side beam 25L in the width direction. In particular, in this embodiment, the inner edge of the first seal accommodating portion 131 in the width direction is also located outward of the inner edge of the upper surface 132. That is, the first seal accommodating portion 131 is formed so as to completely overlap the upper surface 132 of the left side beam 25L in a plan view. As a result, the first seal accommodating portion 131 is blocked from below by the upper surface 132 of the left side beam 25L.

[0129] 15 shows an example of the left side beam 25L, but the other frames (the front beam 23, the right side beam 25R, and the rear beam 24) are configured in substantially the same manner. That is, the first seal accommodating portion 131 is formed so as to overlap with the front beam 23, the right side beam 25R, and the rear beam 24 in a plan view, and is blocked from below by the front beam 23, etc.

[0130] The first seal member 130 has a rectangular cross section and is hollow. The first seal member 130 is formed of an elastic material such as rubber. The first seal member 130 is housed in the first seal housing 131 and is arranged along the extension direction of the first seal housing 131. That is, the first seal member 130 is arranged in a generally rectangular ring shape in a plan view along the upper portion of the cabin frame 20 (the left side beam 25L, the front beam 23, the right side beam 25R, and the rear beam 24). The first seal member 130 is sandwiched between the cabin frame 20 (the left side beam 25L in FIG. 15 ) and the inner roof 31 fixed to the cabin frame 20 and is held in a vertically compressed state.

[0131] The first seal member 130 configured in this manner seals the gap between the cabin frame 20 and the inner roof 31, preventing water from entering the cabin 10 through the gap. In particular, in this embodiment, the first seal housing 131 is blocked from below by the cabin frame 20 (left side beam 25L). Therefore, even if water is sprayed from below when washing the tractor 1, it is difficult for the water to directly enter the first seal housing 131. This effectively improves the sealing performance between the cabin frame 20 and the inner roof 31.

[0132] 15, a second seal member 140 is provided between the inner roof 31 and the outer roof 32 to prevent water from entering the roof 30 from the outside. The following describes the arrangement of the second seal member 140, taking as an example the cross-sectional structure of the middle portion of the left side beam 25L as shown in FIG.

[0133] The upper surface of the inner roof 31 is formed with a first inclined portion 141 that slopes downward from the outer edge of the inner roof 31 toward the inside, a second inclined portion 142 that slopes upward toward the inside of the inner roof 31, and a second seal accommodating portion 143 in which the second seal member 140 is accommodated.

[0134] The first inclined portion 141 and the second inclined portion 142 are formed around the entire outer edge of the inner roof 31. The second inclined portion 142 is formed so as to be adjacent to the inside of the first inclined portion 141. The first inclined portion 141 and the second inclined portion 142 formed in this manner form a groove that is approximately V-shaped in cross section. An inclined portion 144 is formed on the outer edge of the outer roof 32 so as to follow the second inclined portion 142 of the inner roof 31. The outer edge of the outer roof 32 is formed so as to face the first inclined portion 141 from above and below. As a result, the gap between the inner roof 31 and the outer roof 32 is covered and hidden from below by the first inclined portion 141.

[0135] The first inclined portions 141 are formed so as to slope downward toward the corners of the roof 30, which is formed in a generally rectangular shape in a plan view. For example, as shown in FIG. 23 , the first inclined portion 141 formed on the left side of the inner roof 31 is formed so as to slope downward from approximately the center between the front and rear of the inner roof 31 toward both the front and rear sides (the front and rear corners of the roof 30). Although not shown, the same applies to the first inclined portion 141 formed on the right side of the inner roof 31. As shown in FIG. 9 , the first inclined portion 141 formed on the rear side of the inner roof 31 is formed so as to slope downward from approximately the center between the left and right of the inner roof 31 toward both the left and right sides (the left and right corners of the roof 30). Although not shown, the same applies to the first inclined portion 141 formed on the front side of the inner roof 31.

[0136] The second seal accommodating portion 143 is formed inside the second inclined portion 142. The second seal accommodating portion 143 is also formed around the entire circumference of the inner roof 31. The second seal accommodating portion 143 is formed in a ring shape in a plan view so as to surround the internal space of the roof 30 (the space in which the duct 70 and various devices are arranged) from the outside. The second seal accommodating portion 143 is formed in a shape that ensures space for accommodating the second seal member 140. In this embodiment, the second seal accommodating portion 143 is formed by forming the upper surface of the inner roof 31 in a stepped shape; however, it is also possible to form the upper surface of the inner roof 31 in a concave shape that is recessed downward, for example.

[0137] The second seal member 140 has a rectangular cross section and is hollow. The second seal member 140 is made of an elastic material such as rubber. The second seal member 140 is housed in the second seal housing portion 143 and is arranged along the extension direction of the second seal housing portion 143. In other words, the second seal member 140 is arranged around the entire periphery of the inner roof 31. The second seal member 140 is sandwiched between the inner roof 31 and the outer roof 32 fixed to the inner roof 31 and is held in a vertically compressed state.

[0138] The second seal member 140 configured in this manner seals the gap between the inner roof 31 and the outer roof 32, preventing water from entering the roof 30 through the gap. In particular, in this embodiment, the gap between the inclined portion 144 of the outer roof 32 and the second inclined portion 142 of the inner roof 31 is covered from below by the first inclined portion 141 of the inner roof 31. Therefore, even if water is sprayed from below when washing the tractor 1, it is difficult for the water to directly enter the second seal receiving portion 143. This effectively improves the sealing performance between the inner roof 31 and the outer roof 32.

[0139] Furthermore, in this embodiment, water on the roof 30 can be guided by the grooves formed by the first inclined portion 141 and the second inclined portion 142. Specifically, as shown in FIGS. 9 and 23 , water on the roof 30 (e.g., rainwater or water used in a car wash) flows toward the outer edge of the roof 30 and is received by the first inclined portion 141. The water received by the first inclined portion 141 flows toward the corners of the roof 30 according to the inclination of the first inclined portion 141, as indicated by the dashed lines in the drawings, and falls downward from the corners of the roof 30. By guiding the water in this manner, the water can fall from a position (near each pillar of the cabin 10) that does not obstruct the driver's view, thereby improving the comfort of the driver.

[0140] Next, the work light 33 provided on the roof 30 will be described.

[0141] 2 and 4 are lights for illuminating the front and rear of the cabin 10. The work lights 33 are provided on the left and right rear portions of the roof 30 and on the left and right front portions of the roof 30. In this embodiment, the work lights 33 are fixed to the roof 30 rather than the cabin frame 20. The mounting structure of the work lights 33 will be described below using the work light 33 provided on the left rear portion of the roof 30 as an example.

[0142] As shown in Figures 9 and 24, the work light 33 is provided with a fixing portion 33a for fixing to the roof 30. The fixing portion 33a is formed of a plate-like member bent into a U-shape in rear view. The work light 33 is disposed below the left rear portion of the inner roof 31. In this state, a bolt 151 is inserted into the fixing portion 33a from below. The upper portion of the bolt 151 is inserted into the inner roof 31. The upper portion of the bolt 151 reaches into the introduction portion 71 of the duct 70 formed in the inner roof 31. A nut 152 disposed in the introduction portion 71 is fastened to the upper end of the bolt 151. In addition, an elastic member 153 for protecting the inner roof 31 is disposed between the bolt 151 and the nut 152.

[0143] 25 , the nut 152 is provided with a locking portion 152a that extends laterally from the portion where the bolt 151 is inserted. The locking portion 152a is arranged so as to be located within a groove 154 formed in the upper surface of the inner roof 31. The groove 154 is formed, for example, between a pair of protrusions 155 that are formed to bulge upward from the upper surface of the inner roof 31. By locking the locking portion 152a with the groove 154, it is possible to prevent the nut 152 from rotating.

[0144] In this way, in this embodiment, the work light 33 can be fixed directly to the roof 30 (inner roof 31) rather than to a framework member such as the cabin frame 20. Furthermore, by engaging the nut 152 with the groove 154, it is possible to prevent the nut 152 from rotating when the bolt 151 is tightened, and the work light 33 can be easily attached.

[0145] Although the work light 33 provided on the left rear portion of the roof 30 has been described, the other work lights 33 are also fixed to the roof 30 by a similar mounting structure.

[0146] As described above, the cabin 10 for a tractor 1 (work vehicle) according to one embodiment of the present disclosure includes an inner roof 31 that forms a ceiling within the cabin, and an outer roof 32 that is provided above the inner roof 31. At least one of the upper surface of the inner roof 31 or the lower surface of the outer roof 32 is provided with a concave duct 70 that guides air flowing into or out of the cabin (see FIG. 12 ). This configuration reduces the number of components. That is, by forming the duct 70 in the roof 30 itself, there is no need to provide a separate duct component. This reduces the number of components, costs, and space.

[0147] The duct 70 also includes a first guide portion 72 capable of guiding air in the front-rear direction, and second guide portions 74 formed on the left and right sides of the first guide portion 72 and capable of guiding the air guided by the first guide portion 72 into the cabin interior. This configuration makes it possible to form a suitable duct 70. In other words, by forming the second guide portions 74 on the left and right sides of the first guide portion 72, it is possible to more easily equalize the flow rate of air branched from the first guide portion 72 to the second guide portion 74.

[0148] The cabin 10 further includes a cabin frame 20 that forms a framework of the cabin 10, and the duct 70 further includes an introduction portion 71 that can guide air introduced from outside through the cabin frame 20 to the first guide portion 72. With this configuration, outside air can be introduced into the duct 70 through the cabin frame 20. This allows for effective use of the cabin frame 20 (use as an air circulation path).

[0149] The cabin frame 20 also includes a pair of left and right rear pillars (a left rear pillar 22L and a right rear pillar 22R) provided at the rear, and the inlet portion 71 can guide air introduced from outside the cabin through either one of the pair of left and right rear pillars. This configuration makes it possible to effectively utilize the rear pillars (the left rear pillar 22L and the right rear pillar 22R).

[0150] Furthermore, the introduction portion 71 can guide the air introduced from inside the cabin to the first guide portion 72. With this configuration, it is possible to circulate the air inside the cabin (inside air).

[0151] The cabin 10 further includes an inside / outside air switching mechanism 100 that can switch between an outside air introduction state in which air can be introduced from outside the cabin to the introduction portion 71 and an inside air circulation state in which air can be introduced from inside the cabin to the introduction portion 71. With this configuration, it is possible to appropriately switch between the outside air introduction state and the inside air circulation state.

[0152] The duct 70 further includes an exhaust section 75 that can guide the air inside the cabin to the outside. With this configuration, the roof 30 can be effectively used to exhaust the air inside the cabin to the outside.

[0153] The exhaust portion 75 can guide the air inside the cabin to either one of the pair of left and right rear pillars (the left rear pillar 22L and the right rear pillar 22R). With this configuration, the inside air can be exhausted through the rear pillars (the left rear pillar 22L and the right rear pillar 22R).

[0154] Furthermore, the exhaust portion 75 constitutes a resonator 120 that can reduce noise inside the cabin. With this configuration, the exhaust portion 75 can be effectively utilized to reduce noise inside the cabin.

[0155] As described above, the cabin 10 for a tractor 1 (work vehicle) according to one aspect of the present disclosure includes: a cabin frame 20; an inner roof 31 fixed to the cabin frame 20 and constituting a ceiling facing the interior of the cabin; and an outer roof 32 provided above the inner roof 31. The upper surface of the inner roof 31 is provided with a concave duct 70 for guiding air flowing into or out of the cabin, and fasteners 31a (first fasteners) for fastening the inner roof 31 to the cabin frame 20 are provided inside the duct 70 (see FIG. 15 ). This configuration ensures a large space between the inner roof 31 and the outer roof 32. Specifically, by arranging the fasteners 31a inside the duct 70 rather than arranging the fasteners 31a to avoid the duct 70, it is not necessary to provide a separate space for arranging the fasteners 31a, and therefore a large space can be ensured between the inner roof 31 and the outer roof 32.

[0156] The cabin frame 20 includes upper beams (front beam 23, rear beam 24, left side beam 25L, and right side beam 25R) formed in a frame shape in a plan view, and the duct 70 is formed so that at least a portion thereof is located outside the upper beams in a plan view. By configuring the duct 70 in this manner, it is possible to arrange the duct 70 up to the outside of the upper beams, thereby increasing the degree of freedom in design.

[0157] Furthermore, a concave first seal receiving portion 131 (receiving portion) is formed on the underside of the inner roof 31, the first seal receiving portion 131 being formed inside the outer edge of the upper beam, and a first seal member 130 (sealing member) that seals between the inner roof 31 and the upper beam is disposed in the first seal receiving portion 131. This configuration can improve the sealing performance between the inner roof 31 and the upper beam. In particular, by forming the first seal receiving portion 131 inside the outer edge of the upper beam, it is possible to prevent water from the outside from directly hitting the first seal member 130, effectively improving the sealing performance.

[0158] Further, the upper surface of the inner roof 31 is formed with a first inclined portion 141 that is inclined downward from the outer edge side of the inner roof 31 toward the inside of the inner roof 31, and a second inclined portion 142 that is inclined upward toward the inside of the inner roof 31, on an inner side of the inner roof 31 than the first inclined portion 141, and the outer roof 32 is arranged to cover the second inclined portion 142 from above. This configuration can improve the sealing performance between the inner roof 31 and the outer roof 32. In other words, by inclining the first inclined portion 141, it can be made difficult for water used for car washing to enter between the inner roof 31 and the outer roof 32 from below.

[0159] Furthermore, the inner roof 31 is formed in a generally rectangular shape in a plan view, and the first inclined portions 141 are formed so as to incline downward toward the corners of the inner roof 31 in a plan view (see FIGS. 9 and 23 ). With this configuration, the first inclined portions 141 can be used to guide water to the corners of the inner roof 31, and falling water can be prevented from interfering with the driver's visibility or work.

[0160] The cabin 10 further includes a work light 33 fixed to the inner roof 31 (see FIG. 24). With this configuration, the work light 33 can be directly attached to the inner roof 31, thereby simplifying the mounting structure of the work light 33.

[0161] Furthermore, in the cabin 10, a nut 152 (second fixing device) for fixing the work light 33 to the inner roof 31 is provided inside the duct 70. By configuring the cabin 10 in this manner, the duct 70 can be effectively used to attach the work light 33.

[0162] As described above, the cabin 10 for a tractor 1 (work vehicle) according to one aspect of the present disclosure is a cabin 10 for a tractor 1 including an inner roof 31 that forms a ceiling inside the cabin, and an outer roof 32 that is provided above the inner roof 31. At least one of the upper surface of the inner roof 31 or the lower surface of the outer roof 32 is provided with a concave resonator 120 that can reduce noise inside the cabin (see FIG. 20 , etc.). This configuration makes it possible to reduce noise inside the cabin 10. Furthermore, the space between the inner roof 31 and the outer roof 32 can be effectively utilized.

[0163] Furthermore, a duct 70 (exhaust portion 75) is formed in a concave shape on at least one of the upper surface of the inner roof 31 and the lower surface of the outer roof 32 to guide air flowing out from the cabin, and the resonator 120 is formed in the middle of the duct 70. With this configuration, the duct 70 can be effectively used to configure the resonator 120.

[0164] Further, a rectifying mechanism 125 is provided midway through the duct 70. The rectifying mechanism 125 allows air to flow out of the cabin in a first direction and inhibits air from flowing back into the cabin in a second direction. This configuration can suppress a pressure increase inside the cabin 10. This makes it easier to close the door 41 and the rear panel 42.

[0165] The rectifying mechanism 125 further includes a partition member 122 that partitions the duct 70 (discharge portion 75), and an opening / closing member 123 (elastic member) that is disposed to close an opening 122c formed in the partition member 122 and opens the opening 122c in accordance with the flow of air in the first direction. By configuring the rectifying mechanism 125 in this manner, the rectifying mechanism 125 can be simply configured.

[0166] The inner roof 31 is also formed with a recess 31b formed at a position facing the interior of the cabin, and an inside air inlet 75a (through hole) formed in the recess 31b so as to communicate the interior of the cabin with the resonator 120. With this configuration, air can be guided to the inside air inlet 75a by the recess 31b.

[0167] The cabin 10 further includes a cover member 121 disposed to cover the inside air inlet 75a from the inside of the cabin. With this configuration, the inside air inlet 75a can be concealed by the cover member 121, thereby improving the aesthetic appearance of the cabin interior.

[0168] Moreover, the resonator 120 is formed at the rear of the inner roof 31 or the outer roof 32. With this configuration, the space at the rear of the roof 30 can be used effectively.

[0169] As described above, the cabin 10 for a tractor 1 (work vehicle) according to one aspect of the present disclosure is a cabin 10 for a tractor 1 having a roof 30 with a duct 70 for guiding air, and includes: 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 61 that purifies the outside air introduced into the left rear pillar 22L; a filter housing 62 that houses the filter 61; and a first cover member 63 that covers the filter housing 62 from the exterior (see FIG. 6 , etc.). This configuration allows the filter 61 to be conveniently positioned. That is, by covering the filter housing 62 in which the filter 61 is housed with the first cover member 63, the filter 61 can be positioned while suppressing degradation of the aesthetic appearance. Furthermore, the provision of the first cover member 63 makes it difficult for dust and water to enter the filter 61.

[0170] The cabin 10 further includes a second cover member 64 that covers the filter housing portion 62 from the outside of the cabin. This configuration makes it more difficult for dust and water to enter the filter 61.

[0171] Furthermore, the filter housing portion 62 has an opening 62b through which outside air can flow, and the first cover member 63 and the second cover member 64 are arranged so as to overlap at least partially when viewed from the direction of flow of the outside air flowing through the opening 62b (in this embodiment, the direction perpendicular to the introduction surface 62a). This configuration makes it difficult for water, dust, etc. from the outside to reach the filter 61. This makes it possible to suppress contamination and deterioration of the filter 61.

[0172] Furthermore, the first cover member 63 is arranged to cover the filter accommodating portion 62 at least from the rear, and the second cover member 64 is arranged to cover the filter accommodating portion 62 at least from the side. With this configuration, the filter accommodating portion 62 can be covered from multiple directions, thereby effectively suppressing deterioration of the filter 61.

[0173] Furthermore, the first cover member 63 and the second cover member 64 are formed of different materials. By configuring them in this way, the difference in materials can improve the aesthetic appearance.

[0174] The first cover member 63 is made of a resin material, and the second cover member 64 is made of a metal material. By configuring them in this way, the difference in materials can improve the aesthetic appearance.

[0175] Furthermore, a rear combination lamp 63c (lamp) is provided on the first cover member 63. By configuring it in this manner, the rear combination lamp 63c can be integrated into the first cover member 63, making it easy to manage parts.

[0176] Further, the first cover member 63 is provided with a lifting / lowering operating tool 63d (operating tool) for the lifting device 9 of the tractor 1. By configuring it in this manner, it is possible to easily operate the lifting device 9 from outside the vehicle.

[0177] The tractor 1 according to the present embodiment is an embodiment of a work vehicle. The left rear pillar 22L and the right rear pillar 22R according to the present embodiment are an embodiment of a rear pillar. The fastener 31a according to the present embodiment is an embodiment of a first fixing device. The front beam 23, the rear beam 24, the left side beam 25L, and the right side beam 25R according to the present embodiment are an embodiment of an upper beam. The first seal receiving portion 131 according to the present embodiment is an embodiment of a receiving portion. The first seal member 130 according to the present embodiment is an embodiment of a seal member. The nut 152 according to the present embodiment is an embodiment of a second fixing device. The open-close member 123 according to the present embodiment is an embodiment of an elastic member. The inside air inlet 75a according to the present embodiment is an embodiment of a through-hole. The rear combination lamp 63c according to the present embodiment is an embodiment of a lamp. The lifting / lowering operating device 63d according to the present embodiment is an embodiment of an operating device.

[0178] Although one 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.

[0179] For example, in the above embodiment, the tractor 1 is used as an example of a work vehicle, but other vehicles such as agricultural vehicles, construction vehicles, and industrial vehicles may also be used.

[0180] Furthermore, the configuration (shape, size, number, etc.) of each member described in the above embodiment is not limited and can be changed as desired.

[0181] In addition, in the present embodiment, the configuration in which outside air is introduced into the roof 30 through the left rear pillar 22L and the configuration in which inside air is exhausted to the outside through the right rear pillar 22R has been described, but the present invention is not limited to this. For example, it is also possible to adopt a configuration in which outside air is introduced into the roof 30 through the right rear pillar 22R and the inside air is exhausted to the outside through the left rear pillar 22L. Furthermore, it is also possible to adopt 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 (e.g., the left front pillar 21L, the right front pillar 21R, etc.).

[0182] The shape of the duct 70 described in this embodiment (see FIG. 12) is merely an example and can be changed as desired. For example, the number of branches of the duct 70 can be increased or decreased, and the cross-sectional shape can be changed as desired.

[0183] 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 92 can be arranged at the rear of the roof 30. The blower 91 and the air conditioning unit 92 can also be arranged adjacent to each other (or directly connected).

[0184] The present invention can be applied to a cabin for a work vehicle.

[0185] REFERENCE SIGNS LIST 1 Tractor 10 Cabin 20 Cabin frame 22L Left rear pillar 22R Right rear pillar 30 Roof 31 Inner roof 32 Outer roof 33 Work light 61 Filter 62 Filter housing portion 63 First cover member 64 Second cover member 70 Duct 71 Inlet portion 72 First guide portion 74 Second guide portion 75 Discharge portion 100 Inside / outside air switching mechanism 120 Resonator 125 Rectification mechanism

Claims

1. A cabin for a work vehicle, comprising an inner roof that constitutes the ceiling inside the cabin and an outer roof provided above the inner roof, wherein at least one of the upper surface of the inner roof or the lower surface of the outer roof is formed in a concave shape and a resonator capable of reducing the noise inside the cabin is formed.

2. At least one of the upper surface of the inner roof or the lower surface of the outer roof is formed in a concave shape and a duct for guiding the air flowing out of the cabin is formed, and the resonator is formed in the middle of the duct. The cabin for a work vehicle according to claim 1.

3. The middle of the duct further comprises a rectifying mechanism that allows the air to flow in the first direction flowing out of the cabin and inhibits the air from flowing in the second direction flowing back into the cabin. The cabin for a work vehicle according to claim 2.

4. The rectifying mechanism comprises a partitioning member that partitions the duct and an elastic member that is arranged to close the opening formed in the partitioning member and opens the opening as the air flows in the first direction. The cabin for a work vehicle according to claim 3.

5. The inner roof is formed with a recess formed at a position facing the inside of the cabin and a through hole formed in the recess and formed to communicate the inside of the cabin with the resonator. The cabin for a work vehicle according to claim 1.

6. The cabin for a work vehicle according to claim 5 further comprises a cover member arranged to cover the through hole from the inside of the cabin.

7. The resonator is formed at the rear part of the inner roof or the outer roof. The cabin for a work vehicle according to claim 1.

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