Cabin for service vehicle

Abstract

To provide a cabin for a service vehicle which enables reduction of the number of components.SOLUTION: A cabin 10 for a tractor 1 includes: an inner roof 31 forming a ceiling in a cabin chamber; and an outer roof 32 provided above the inner roof 31. A duct 70 which is formed in a recessed part and guides air circulating into the cabin chamber or air flowing out from the cabin chamber is formed in at least one of the upper surface of the inner roof 31 and the lower surface of the outer roof 32.SELECTED DRAWING: Figure 12

Description

Technical Field

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

Background Art

[0002] Conventionally, the technology of a cabin for a work vehicle has been known. For example, it is as described in Patent Document 1.

[0003] Patent Document 1 describes a cabin including an inner roof that forms a ceiling facing the interior of the cabin and an outer roof provided above the inner roof. An air conditioner is housed between the inner roof and the outer roof. The conditioned air from the air conditioner is blown into the interior from the air outlets formed in the inner roof.

[0004] In such a cabin, it is necessary to provide a duct for guiding the conditioned air from the air conditioner to the air outlets. However, since the duct is provided in the cabin, there is room for improvement in that the number of parts of the cabin increases and the assembly man-hours increase accordingly.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] One aspect of the present disclosure has been made in view of the above circumstances, and the problem to be solved is to provide a cabin for a work vehicle capable of reducing the number of parts.

Means for Solving the Problems

[0007] The problem to be solved by one aspect of the present disclosure is as described above, and next, 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 including an inner roof constituting a ceiling in the cabin interior 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 duct for guiding air flowing into the cabin interior or air flowing out from the cabin interior is formed.

[0009] Further, the duct according to one aspect of the present disclosure includes a first guiding portion capable of guiding air in the front-rear direction, and second guiding portions respectively formed on the left and right of the first guiding portion and capable of guiding the air guided by the first guiding portion into the cabin interior.

[0010] Further, a cabin for a work vehicle according to one aspect of the present disclosure further includes a cabin frame constituting a framework of the cabin, and the duct further includes an introduction portion capable of guiding air introduced from outside the vehicle through the cabin frame to the first guiding portion.

[0011] Further, the cabin frame according to one aspect of the present disclosure includes a pair of left and right rear pillars provided at the rear, and the introduction portion is capable of guiding air introduced from outside the vehicle through either one of the pair of left and right rear pillars.

[0012] Further, the introduction portion according to one aspect of the present disclosure is capable of guiding air introduced from the cabin interior to the first guiding portion.

[0013] Further, a cabin for a work vehicle according to one aspect of the present disclosure further includes an inside / outside air switching mechanism capable of switching between an outside air introduction state in which air is introduced from outside the vehicle to the introduction portion and an internal air circulation state in which air is introduced from the cabin interior to the introduction portion.

[0014] Further, the duct according to one aspect of the present disclosure further includes a discharge portion capable of guiding the air in the cabin to the outside.

[0015] Further, the discharge portion according to one aspect of the present disclosure is capable of guiding the air in the cabin to either one of the pair of left and right rear pillars.

[0016] Further, the discharge portion according to one aspect of the present disclosure constitutes a resonator capable of reducing the noise in the cabin.

Advantages of the Invention

[0017] According to one aspect of the present disclosure, the number of components can be reduced.

Brief Description of the Drawings

[0018]

Figure 1

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Mode for Carrying Out the Invention

[0019] Hereinafter, the directions indicated by the arrows U, D, F, B, L, and R in the drawings will be defined as the upward direction, downward direction, forward direction, rearward direction, leftward direction, and rightward direction, respectively, for explanation. Note that the forward direction is the forward direction of the tractor 1, and the rearward direction is the reverse direction of the tractor 1.

[0020] First, the overall configuration of the tractor 1, which is a work vehicle equipped with the cabin 10 according to one aspect of the present disclosure, will be described.

[0021] The tractor 1 shown in Fig. 1 mainly comprises a body 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, etc.

[0022] The body frame 2 is a frame-shaped member formed by appropriately combining a plurality of plate materials. The body frame 2 is arranged at the front part of the tractor 1 with its longitudinal direction oriented in the front-rear direction. The engine 3 is fixed to the rear part of the body frame 2. The engine 3 is covered by the bonnet 4. A transmission case 5 is provided at the rear part of the engine 3. A transmission (not shown) for changing the power from the engine 3 is accommodated in the transmission case 5.

[0023] The front part of the body frame 2 is supported by a pair of left and right front wheels 6 via a front axle mechanism (not shown). The rear part 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 by the fenders 8 from above.

[0024] A lifting device 9 is provided at the rear part of the transmission case 5. Various working devices (for example, a tillage tractor, etc.) can be mounted on the lifting device 9. The lifting device 9 can lift the mounted working device by an actuator such as a hydraulic cylinder.

[0025] The power of the engine 3 is transmitted to the front axle mechanism after being shifted by a transmission (not shown) accommodated in the transmission case 5 and can be transmitted to the front wheels 6 via the front axle mechanism. Also, the power shifted by the transmission can be transmitted to the rear wheels 7 via the rear axle mechanism. In this way, the front wheels 6 and the rear wheels 7 are rotationally driven by the power of the engine 3, and the tractor 1 can travel. Also, the working device mounted on the lifting device 9 can be driven by the power of the engine 3.

[0026] A cabin 10 is provided behind the engine 3. The cabin 10 is placed on the vehicle body (such as the transmission case 5, etc.). Inside the cabin 10, an interior space for the driver to board is formed. In the interior space, a seat 11 for the driver to sit on is arranged. Also, in the front part of the cabin 10, a steering wheel 12 for adjusting the steering angle of the front wheel 6 is arranged.

[0027] Next, the configuration of the cabin 10 will be described. As shown in FIGS. 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, etc.

[0028] The cabin frame 20 shown in FIG. 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, and a floor sheet 29, etc.

[0029] 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 substantially in the vertical direction. The left front pillar 21L and the right front pillar 21R are arranged at intervals from each other left and right at the front part of the cabin 10. The left rear pillar 22L and the right rear pillar 22R are arranged at intervals from each other left and right at the rear part of the cabin 10.

[0030] 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 etc. 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 in a rectangular frame shape in plan view.

[0031] The rear lower frame 26 is arranged to connect the lower ends of the left rear pillar 22L and the right rear pillar 22R. The left side lower frame 27L is arranged to extend forward and downward from the left rear pillar 22L. The right side lower frame 27R is arranged to extend forward and downward from the right rear pillar 22R. The left side lower frame 27L and the right side lower frame 27R are formed in a curved shape in side view that bulges upward and forward, and fenders 8 (see FIGS. 1 and 2) are respectively fixed to the lower parts of the left side lower frame 27L and the right side lower frame 27R.

[0032] A step 28 that constitutes a floor is arranged at the lower part of the cabin frame 20. The step 28 is fixed to the lower ends of the left front pillar 21L, right front pillar 21R, left side lower frame 27L, and right side lower frame 27R. A floor seat 29 for placing the seat 11 at a position higher than the step 28 is provided behind the step 28.

[0033] The roof 30 is provided at the upper part of the cabin frame 20 and covers the seat 11 from above. The roof 30 mainly comprises an inner roof 31 and an outer roof 32.

[0034] The inner roof 31 shown in FIGS. 3 and 4 is fixed to the upper part of the cabin frame 20 and constitutes the ceiling inside the cabin 10. An air conditioner unit 92 and the like, which will be described later, 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.

[0035] As shown in FIG. 2, doors 41 are provided on the left and right side portions of the cabin frame 20 so as to be openable and closable. A rear panel 42 is provided on the rear portion of the cabin frame 20 so as to be openable and closable. As shown in FIG. 4, a front panel 43 is provided on the front portion of the cabin frame 20. In this way, an interior space surrounded by the roof 30, the doors 41, the rear panel 42, and the front panel 43 is formed in the cabin 10.

[0036] In the cabin 10 according to the present embodiment, outside air can be introduced into the interior of the roof 30 via the left rear pillar 22L. Also, indoor air (inside air) can be introduced into the interior of the roof 30 via the inner roof 31. The air conditioner unit 92 in the roof 30 conditions the air in the roof 30. The air conditioned by the air conditioner unit 92 is blown into the interior. Also, when the pressure inside the cabin increases when the door 41 of the cabin 10 is closed or the like, the indoor air can be discharged to the outside via the roof 30 and the right rear pillar 22R, suppressing the increase in the indoor pressure. Hereinafter, the structures related to the air circulation as described above will be described in order.

[0037] First, the structure around the left rear pillar 22L for introducing outside air into the interior of the roof 30 will be described.

[0038] As shown in FIGS. 5, 6, and 7, a pair of upper and lower door support portions 51 are provided on the left rear pillar 22L. By connecting a pair of upper and lower hinge portions 41a provided on the door 41 to the pair of upper and lower door support portions 51 so as to be rotatable, the door 41 is attached to the left rear pillar 22L. Further, a filter housing portion 62 for housing a filter 61 for purifying outside air is provided on the left rear pillar 22L. Further, a first cover member 63 and a second cover member 64 are provided on the left rear pillar 22L so as to cover the filter housing portion 62.

[0039] As shown in FIGS. 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 having a substantially rectangular cross section. A plurality of openings 52 communicating the inside and outside of the left rear pillar 22L are formed on the side surface of the left rear pillar 22L that faces substantially leftward. In the illustrated example, an example is shown in which four rectangular openings 52 are arranged vertically on the left side surface of the left rear pillar 22L. The left rear pillar 22L can introduce outside air from the openings 52. The outside air introduced into the left rear pillar 22L can flow upward through the left rear pillar 22L and flow into the roof 30 from the upper end portion of the left rear pillar 22L.

[0040] The filter housing portion 62 is formed in a substantially rectangular parallelepiped shape that is long in the vertical direction and hollow. The right side surface of the filter housing portion 62 is open. The left side surface (introduction surface 62a) of the filter housing portion 62 is formed in a mesh shape with a large number of minute openings 62b formed therein. Air can flow in a direction orthogonal to the introduction surface 62a through the openings 62b. Thereby, air can flow from the outside to the inside of the filter housing portion 62 through the introduction surface 62a of the filter housing portion 62. Inside the filter housing portion 62, a substantially rectangular parallelepiped filter 61 that is long in the vertical direction is housed. The filter 61 can remove dust contained in the air and purify the air.

[0041] The filter housing portion 62 is fixed to the left rear pillar 22L in a state where the filter 61 is housed. At this time, the opening 52 formed on the left side surface of the left rear pillar 22L is arranged so as to be entirely covered by the filter housing portion 62.

[0042] As shown in FIGS. 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 of, for example, 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.

[0043] An extension portion 63a is formed at the middle part in the vertical direction 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 portion 63a is formed to extend forward from the left end portion of the first cover member 63. The front end portion of the extension portion 63a is bent outward (left side) in the left and right directions.

[0044] A guide surface 63b is formed on the first cover member 63. The guide surface 63b is formed to extend forward from the right end portion of the first cover member 63. The guide surface 63b is formed to follow the outer edge shape of the rear panel 42 in a rear view. For example, as shown in FIG. 9, the corner portion of the rear panel 42 is formed in an R shape, and the guide surface 63b of the first cover member 63 is formed to follow the R shape of the rear panel 42. The guide surface 63b is formed to be slightly inclined toward the center side of the rear panel 42 as it goes forward, as shown in FIG. 7.

[0045] A rear combination lamp 63c in which a plurality of lamps such as a brake lamp and a turn signal lamp are integrated is provided on the rear surface of the first cover member 63. Also, on the rear surface of the first cover member 63 (below the rear combination lamp 63c), an elevating operation tool 63d (see FIGS. 5, etc.) for a driver outside the vehicle to raise and lower the elevating device 9 (see FIG. 1) is provided. The elevating operation tool 63d can be configured by, for example, a push button or the like.

[0046] As shown in Fig. 7, the first cover member 63 is arranged such that the rear part of the filter housing part 62 is positioned inside. Thereby, the first cover member 63 can cover the rear part of the filter housing part 62 (the rear surface of the filter housing part 62 and the rear part of the introduction surface 62a) from the outdoor side (rear side) of the cabin 10. The first cover member 63 (extension part 63a) is arranged so as to leave a predetermined gap between it and the introduction surface 62a of the filter housing part 62.

[0047] As shown in Figs. 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 different from that of the first cover member 63 (for example, a metal material or the like). The vertical length of the second cover member 64 is formed to be substantially the same as the distance between the pair of upper and lower hinge parts 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.

[0048] The second cover member 64 is arranged so as to extend between the pair of upper and lower hinge parts 41a of the door 41. As shown in Fig. 7, the rear part of the second cover member 64 is arranged to overlap with the extension part 63a of the first cover member 63 in the left - right direction. The front end part of the second cover member 64 is arranged to be positioned in front of the front end part of the filter housing part 62. Also, the front end part of the second cover member 64 is arranged to be positioned in front of the rear end part of the door 41. Thereby, the second cover member 64 can cover the front part of the filter housing part 62 (the front surface of the filter housing part 62 and the introduction surface 62a) from the outdoor side (left side) of the cabin 10. The second cover member 64 is arranged so as to leave a predetermined gap between it and the first cover member 63 (extension part 63a), the filter housing part 62, and the door 41.

[0049] In this way, the filter housing portion 62 is covered from the rear and the left side by the first cover member 63 and the second cover member 64. In particular, the introduction surface 62a of the filter housing 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 air flow direction (i.e., the direction perpendicular to the introduction surface 62a) of the air flowing through the introduction surface 62a.

[0050] Here, as shown in FIG. 7, a door seal member 41b and a rear panel seal member 42b for sealing the cabin 10 are provided on the openable / closable door 41 and the rear panel 42.

[0051] The door seal member 41b is provided over the entire outer edge portion of the door 41. The door seal member 41b has a double lip structure that seals the gaps between the two opposing surfaces and the door 41 by contacting the two opposing surfaces. Specifically described with reference to the cross-section shown in FIG. 7, the door seal member 41b includes a main lip 41c that seals between the cabin frame 20 (left rear pillar 22L) and a sub-lip 41d that seals between the filter housing portion 62. In this way, by sealing between the two opposing surfaces respectively, the door seal member 41b can effectively suppress the intrusion of water, wind, dust, etc. from the outside into the indoor space of the cabin 10.

[0052] In particular, in this embodiment, the door seal member 41b at the rear end portion of the door 41 is covered from the left side by the second cover member 64. Thereby, for example, it is possible to suppress the direct hitting of the high-pressure water or wind and rain during car washing from the left on the door seal member 41b, and it is possible to more effectively suppress the intrusion of water or the like into the cabin 10.

[0053] In addition, 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 the same as that of the door seal member 41b. Referring specifically to the cross-section shown in FIG. 7, the rear panel seal member 42b includes a main lip 42c that seals between the cabin frame 20 (left rear pillar 22L) and a sub-lip 42d that seals between the first cover member 63 (guide surface 63b).

[0054] Here, as described above, the guide surface 63b of the first cover member 63 is formed along 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 is guided to fit into the outer edge shape of the rear panel 42 while contacting the guide surface 63b. By guiding the rear panel seal member 42b by the guide surface 63b of the first cover member 63 in this way, it is possible to prevent unintentional deformation of the rear panel seal member 42b that bends along the outer edge shape of the rear panel 42, and it is possible to ensure the sealing performance of the rear panel 42.

[0055] The state in which outside air is introduced from the left rear pillar 22L configured as described above will be described with reference to FIG. 7.

[0056] When air is sucked by a blower 91 disposed in a roof 30 to be described later, outside air is introduced through the opening 52 of the left rear pillar 22L, and the outside air flows upward in the left rear pillar 22L and is guided to the roof 30. The outside air flows into the filter housing portion 62 through the gap between the first cover member 63 and the second cover member 64, and after being dust-removed by the filter 61 housed in the filter housing portion 62, it is introduced into the left rear pillar 22L.

[0057] Here, since the first cover member 63 and the second cover member 64 are arranged in the direction in which the introduction surface 62a of the filter housing portion 62 faces (the direction perpendicular to the introduction surface 62a), outside air does not flow vertically toward the introduction surface 62a of the filter housing portion 62, but flows around the first cover member 63 and the second cover member 64.

[0058] Specifically, the outside air located in front of the second cover member 64 flows backward through the gap between the second cover member 64 and the door 41, and then flows into the filter housing portion 62 from the introduction surface 62a of the filter housing portion 62. Also, the 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 into the filter housing portion 62 from the introduction surface 62a of 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 and the like.

[0059] Although detailed description is omitted, the structure around the right rear pillar 22R is configured to be substantially left-right symmetric with the structure around the left rear pillar 22L. However, since the air inside the cabin 10 is discharged to the outside from the right rear pillar 22R and outside air is not introduced into the cabin, there is no need to provide a filter 61 or a filter housing portion 62 as provided in the left rear pillar 22L in the right rear pillar 22R.

[0060] Next, the structure of the roof 30 will be described.

[0061] As shown in FIGS. 3 and 4, the roof 30 includes an inner roof 31 and an outer roof 32. Inside the roof 30, a duct 70 is formed to guide the air flowing into the cabin 10 of the vehicle interior or the air flowing out from the vehicle interior to the outside. Also, devices such as an air conditioning unit 92 are housed in the roof 30 (inner roof 31). First, the configuration of the inner roof 31 will be described.

[0062] Figures 10 and 11 illustrate the inner roof 31 alone (excluding devices such as the air conditioner unit 92 housed in the inner roof 31). Further, for the purpose of explanation, FIG. 12 shows a diagram in which the shape of the inner roof 31 is schematized. FIGS. 11 and 12 also show the upper beams (front beam 23, rear beam 24, left side beam 25L, and right side beam 25R) in dashed lines to indicate the relative positional relationship with the inner roof 31.

[0063] A duct 70 capable of guiding air is formed on the upper surface of the inner roof 31. In the present embodiment, the duct 70 is formed mainly by the upper surface of the inner roof 31 which is mainly formed in a concave shape. The duct 70 mainly includes an introduction part 71, a first guiding part 72, an air conditioner housing part 73, a second guiding part 74, a discharge part 75, and the like.

[0064] The introduction part 71 is formed at the left rear part of the inner roof 31. More specifically, the introduction part 71 is formed at the rear side of the front-rear center of the inner roof 31 in the front-rear direction. Further, the introduction part 71 is formed so as to extend from the vicinity of the left end of the inner roof 31 to the vicinity of the left-right center in the left-right direction. In the introduction part 71, an outside air inlet 71a and an inside air inlet 71b are formed so as to penetrate the inner roof 31 vertically.

[0065] The outside air inlet 71a is formed at the left rear part of the introduction part 71. The outside air inlet 71a is connected to the upper end of the left rear pillar 22L. Thereby, the outside air guided by the left rear pillar 22L is introduced into the duct 70 (introduction part 71) through the outside air inlet 71a.

[0066] The inside air inlet 71b is formed at the right front of the outside air inlet 71a. The inside air inlet 71b is formed so as to open to the indoor space of the cabin 10 (see FIG. 13). Thereby, the inside air of the cabin 10 is introduced into the duct 70 (introduction part 71) through the inside air inlet 71b.

[0067] The first case interior 72 is formed to extend in the front-rear direction at approximately the center of the left and right sides of the inner roof 31. The rear end portion of the first case interior 72 is connected to the right end portion of the introduction portion 71. The front end portion of the first case interior 72 is connected to the air conditioner accommodation portion 73 described later. The first case interior 72 is formed such that the left and right width gradually widens from the rear to the front.

[0068] The air conditioner accommodation portion 73 is formed at the front portion of the inner roof 31. More specifically, the air conditioner accommodation portion 73 is formed on the front side of the front-rear center of the inner roof 31 in the front-rear direction. Also, the air conditioner accommodation portion 73 is formed to extend from the vicinity of the left end portion to the vicinity of the right end portion of the inner roof 31. The front end portion of the first case interior 72 is connected to the left and right center portion at the rear end of the air conditioner accommodation portion 73. An air outlet 73a is formed in the air conditioner accommodation portion 73 so as to penetrate the inner roof 31 vertically.

[0069] The air outlets 73a are respectively formed at both left and right end portions of the air conditioner accommodation portion 73. The air outlets 73a are formed to open to the interior space of the cabin 10 (see FIG. 13). Thereby, the air-conditioned air from the air conditioner unit 92 described later is blown out into the cabin 10 through the air outlets 73a.

[0070] The second case interiors 74 are respectively formed on both left and right sides of the first case interior 72. The second case interiors 74 are respectively connected to both left and right end portions of the air conditioner accommodation portion 73. The second case interiors 74 are formed to extend rearward from the air conditioner accommodation portion 73. An air outlet 74a is formed in the second case interiors 74 so as to penetrate the inner roof 31 vertically.

[0071] Two air outlets 74a are respectively formed in each of the left and right second case interiors 74. The air outlets 74a are formed to open to the interior space of the cabin 10 (see FIG. 13). Thereby, the air-conditioned air from the air conditioner unit 92 described later is blown out into the cabin 10 through the air outlets 74a.

[0072] The discharge part 75 is formed at the right rear part of the inner roof 31. More specifically, the discharge part 75 is formed on the rear side of the front-rear center of the inner roof 31 in the front-rear direction. Also, the discharge part 75 is formed so as to extend from the vicinity of the right end of the inner roof 31 to the vicinity of the left-right center (near the introduction part 71) in the left-right direction. In the present embodiment, a resonator 120 for reducing the noise in the cabin 10 is configured by the discharge part 75. In the discharge part 75, an inner air inlet 75a and an inner air outlet 75b are formed so as to penetrate the inner roof 31 vertically.

[0073] The inner air inlet 75a is formed at the left part of the discharge part 75. The inner air inlet 75a is formed so as to open to the interior space of the cabin 10 (see FIG. 13). Thereby, the inner air of the cabin 10 is introduced into the duct 70 (discharge part 75) through the inner air inlet 75a.

[0074] The inner air outlet 75b is formed at the right part of the discharge part 75. The inner air outlet 75b is connected to the upper end of the right rear pillar 22R. Thereby, the inner air introduced into the discharge part 75 through the inner air inlet 75a can be discharged to the outside through the inner air outlet 75b and the right rear pillar 22R.

[0075] Details of the resonator 120 configured by the discharge part 75 will be described later.

[0076] Also, on the upper surface of the inner roof 31, a concave first wiring accommodation part 76 and a second wiring accommodation part 77 for arranging wirings and the like are formed.

[0077] The first wiring accommodation part 76 is formed between the first guide part 72 and the left second guide part 74 in the left-right direction. The first wiring accommodation part 76 is formed so as to extend in the front-rear direction and is formed so as to connect the introduction part 71 and the air conditioner accommodation part 73. A seal member 76a is arranged at the front end part of the first wiring accommodation part 76, and the air flowing through the first wiring accommodation part 76 in the front-rear direction is blocked.

[0078] The second wiring accommodating portion 77 is formed between the first guiding portion 72 and the second guiding portion 74 on the right side in the left-right direction. The second wiring accommodating portion 77 is formed to extend in the front-rear direction and to connect the discharge portion 75 and the air conditioner accommodating portion 73. A seal member 77a is disposed at the front end portion of the second wiring accommodating portion 77, and the air flowing through the second wiring accommodating portion 77 in the front-rear direction is blocked.

[0079] Wiring or the like can be appropriately arranged in the first wiring accommodating portion 76 and the second wiring accommodating portion 77 in the front-rear direction. At this time, since the flow of unnecessary air is inhibited by the seal member 76a and the seal member 77a, it is possible to prevent poor air flow and the occurrence of condensation due to the cold air of the air conditioner unit 92 described later.

[0080] The inner roof 31 configured as described above is fixed to the cabin frame 20 from above as shown in FIG. 3. More specifically, the inner roof 31 is fixed to the front beam 23, etc. by fastening tools such as bolts in a state of being placed on the front beam 23, the rear beam 24, the left side beam 25L, and the right side beam 25R.

[0081] Here, as shown in FIGS. 11 and 15, among the fastening tools for fixing the inner roof 31 to the cabin frame 20, some fastening tools 31a are provided inside the duct 70 formed in the inner roof 31. For example, FIG. 15 shows a fastening tool 31a provided inside the second guiding portion 74 on the left side.

[0082] Thus, instead of arranging the fastener 31a while avoiding the duct 70, by arranging the fastener 31a inside the duct 70, it is possible to effectively utilize the internal space of the roof 30. Specifically, since the fastener 31a needs 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), it will be provided at a position overlapping with the front beam 23 or the like in a plan view. By arranging this fastener 31a inside the duct 70, the duct 70 can be formed outside the fastener 31a (see FIG. 15).

[0083] Furthermore, in the present embodiment, by forming a part of the duct 70 to be located outside the front beam 23 or the like, the internal space of the roof 30 is more effectively utilized. For example, in the present embodiment, as shown in FIGS. 11 and 12, a part of the introduction part 71 and the discharge part 75 is formed so as to protrude outside (rear side) the rear beam 24 in a plan view. Note that the shape of the duct 70 is not limited to this, and any part of the duct 70 can be formed to be located outside the front beam 23 or the like. Also, not limited to the duct 70, the arrangement space of various devices (for example, the blower 91, the air conditioner unit 92, etc.) can also be formed to be located outside the cabin frame 20 (the front beam 23 or the like).

[0084] Next, the devices housed in the roof 30 will be described. As shown in FIGS. 4 and 14, an inside / outside air switching mechanism 100, a blower 91, an air conditioner unit 92, and a guide member 93 are housed in the roof 30.

[0085] The inside / outside air switching mechanism 100 shown in FIGS. 14 and 16 switches the air introduced into the roof 30 to either outside air or inside air by opening and closing the outside air inlet 71a formed in the introduction part 71. The specific configuration of the inside / outside air switching mechanism 100 will be described later.

[0086] The blower 91 shown in FIGS. 4 and 14 is a device for sending air into the air conditioner unit 92. The blower 91 is disposed in the right part of the introduction part 71 (near the connection part with the first guide part 72). The blower 91 can send the air in the introduction part 71 toward the first guide part 72.

[0087] The air conditioner unit 92 is a device for performing air conditioning. The air conditioner unit 92 is disposed at the left and right center part of the air conditioner housing part 73. The air inlet 92a of the air conditioner unit 92 is disposed so as to face the front end part of the first guide part 72.

[0088] The guide member 93 guides the air conditioned by the air conditioner unit 92 to the second guide part 74. The guide member 93 is disposed on both the left and right sides of the air conditioner unit 92 within the air conditioner housing part 73. The guide member 93 is formed in a cylindrical shape. One end part of the guide member 93 is connected to air outlets (not shown) respectively formed on the left and right side surfaces of the air conditioner unit 92. The other end part of the guide member 93 is disposed so as to face the front end part of the second guide part 74. The bottom surface of the guide member 93 is connected to the air outlet 73a formed in the air conditioner housing part 73.

[0089] As shown in FIG. 3, an outer roof 32 is provided on the upper part of the inner roof 31 configured as described above. The duct 70 formed in the inner roof 31 is closed from above by the outer roof 32. A seal member for preventing air leakage from the gap between the inner roof 31 and the outer roof 32 is appropriately disposed on the outer edge part of the duct 70.

[0090] In addition, in this embodiment, an example in which the concave duct 70 is formed on the upper surface of the inner roof 31 is shown, but the present invention is not limited to this. For example, it is also possible to form a concave duct on the lower surface of the outer roof 32 instead of the upper surface of the inner roof 31, or to form concave ducts on both the upper surface of the inner roof 31 and the lower surface of the outer roof 32.

[0091] As shown in FIG. 13, the lower surface of the inner roof 31 constitutes the ceiling inside the cabin 10. Therefore, it is desirable to provide a decorative material such as a non-woven fabric on the lower surface of the inner roof 31 (particularly, the portion located inside the cabin 10).

[0092] Further, the cabin 10 is provided with a cover member that covers the cabin frame 20 from the inside. Specifically, 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, a right side beam cover 98R that covers the right side beam 25R, etc. are provided. Each cover member is formed of, for example, resin or the like. By covering the cabin frame 20 with each cover member, the aesthetics inside the cabin 10 can be improved.

[0093] Also, appropriate components can be arranged inside each cover member. For example, as shown in FIG. 7, between the left rear pillar 22L and the left rear pillar cover 95L that covers the left rear pillar 22L, a drain hose 95a of the air conditioner unit 92, wiring 95b of electrical components, etc. can be arranged as needed. Moreover, various devices can be provided on each cover member. For example, it is possible to provide an operating tool or the like for operating the air conditioner unit 92.

[0094] Next, the state of air flow in the roof 30 configured as described above will be described.

[0095] When air-conditioning the interior of the cabin 10, the blower 91 and the air conditioner unit 92 are operated. As shown in FIG. 12, the blower 91 sends the air in the introduction part 71 to the first guide part 72. Along with this, air is introduced into the introduction part 71 from the outside air inlet 71a or the inside air inlet 71b. Note that which of the outside air inlet 71a or the inside air inlet 71b to introduce air from can be selected by an inside / outside air switching mechanism 100 described later.

[0096] The air introduced into the introduction part 71 is sent to the air conditioner unit 92 via the first guide part 72. The air sent to the air conditioner unit 92 is air-conditioned (temperature adjustment, etc.) by the air conditioner unit 92. The air air-conditioned by the air conditioner unit 92 is sent to the second guide part 74 via a guide member 93 (see FIG. 14, etc.).

[0097] The air flowing through the guide member 93 is blown out into the interior of the cabin 10 through the air outlet 73a from the middle part of the guide member 93. Also, the air sent to the second guide part 74 via the guide member 93 is blown out into the interior of the cabin 10 through the air outlet 74a. Thereby, the interior of the cabin 10 can be air-conditioned.

[0098] Also, the resonator 120 constituted by the discharge part 75 can reduce the noise in the interior of the cabin 10. Also, when the pressure in the interior of the cabin 10 increases when the door 41 is closed or the like, the air in the cabin 10 can be discharged to the outside through the discharge part 75. Specifically, the air in the cabin 10 introduced into the discharge part 75 through the inside air inlet 75a can be discharged to the outside of the cabin 10 through the inside air outlet 75b. Thereby, the pressure rise in the cabin 10 can be suppressed, and it becomes easier to close the door 41 and the rear panel 42.

[0099] Next, the inside / outside air switching mechanism 100 provided in the introduction part 71 will be described.

[0100] The inside / outside air switching mechanism 100 shown in FIGS. 16 and 17 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 seal member 104, a motor 105, an arm 106, a connecting shaft 107, and the like.

[0101] The base plate 101 is formed in a substantially flat plate shape. An opening 101a that penetrates the base plate 101 vertically is formed at the center of the base plate 101. The base plate 101 is arranged such that the opening 101a communicates with the outside air inlet 71a and is fixed to the first guide portion 72. A support portion 101b for rotatably supporting the opening / closing member 102 is provided on the left portion of the base plate 101. The support portion 101b is formed in a substantially U shape in a side view, in which both front and rear end portions of a plate-like member are bent upward.

[0102] 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 portion of the opening / closing member 102. The rotating shaft 103 is inserted through the first connecting portion 102a and the support portion 101b. Thereby, the opening / closing member 102 can rotate relative to the base plate 101 about the rotating shaft 103. A second connecting portion 102b for connecting to a connecting shaft 107 described later is erected on the front portion of the opening / closing member 102. A long hole 102c extending in the left-right direction is formed in the second connecting portion 102b.

[0103] 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 so as to extend over the entire circumference of the outer edge of the opening 101a of the base plate 101. The seal member 104 can seal the space between the base plate 101 and the opening / closing member 102 when the opening / closing member 102 closes the opening 101a.

[0104] 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.

[0105] By using the internal and external air switching mechanism 100 configured as described above, it is possible to switch between an external air introduction state in which external air is introduced when performing air conditioning and an internal air circulation state in which internal air is circulated.

[0106] Specifically, the external air introduction state and the internal air circulation state can be switched by an appropriate operating tool. When the internal air circulation state is selected by the operating tool, the motor 105 operates until the state shown in FIG. 17 is reached. More specifically, the output shaft 105a rotates until the connecting shaft 107 is positioned below the output shaft 105a of the motor 105. As a result, the opening / closing member 102 connected to the connecting shaft 107 rotates downward and is pressed against the seal member 104. In this state, since the external air inlet 71a is blocked, external air is not introduced into the introduction portion 71 through the left rear pillar 22L. In the internal air circulation state, indoor air (internal air) is introduced from the internal air inlet 71b shown in FIG. 16 into the introduction portion 71, and the internal air can be air-conditioned by the air conditioning unit 92.

[0107] On the other hand, when the external air introduction state is selected by the operating tool, the motor 105 operates until the state shown in FIG. 18 is reached. More specifically, the output shaft 105a rotates until the connecting shaft 107 is positioned above the output shaft 105a of the motor 105. As a result, the opening / closing member 102 connected to the connecting shaft 107 rotates upward and separates from the seal member 104. In this state, since the external air inlet 71a is opened, external air can be introduced into the introduction portion 71 through the left rear pillar 22L. The external air introduced into the introduction portion 71 is air-conditioned by the air conditioning unit 92 and then blown into the interior of the cabin 10.

[0108] In this way, by using the internal and external air switching mechanism 100, it is possible to switch between the external air introduction state and the internal air circulation state with a simple configuration. Note that the configuration of the internal and external air switching mechanism 100 described in this embodiment is an example, and the configuration can be arbitrarily changed.

[0109] For example, FIG. 19 schematically shows an internal and external air switching mechanism 110 (another example of the internal and external air switching mechanism 100) configured to open and close not only the external air inlet 71a but also the internal air inlet 71b simultaneously. The internal and external air switching mechanism 110 includes an external air opening and closing member 111 capable of opening and closing the external air inlet 71a, an internal air opening and closing member 112 capable of opening and closing the internal air inlet 71b, a swing member 113 connected to the external air opening and closing member 111 and the internal air opening and closing member 112, a motor 114, and the like.

[0110] The external air opening and closing member 111 is rotatably supported about a rotation shaft 111a provided at the left end portion. The internal air opening and closing member 112 is rotatably supported about a rotation shaft 112a provided at the right end portion. The swing member 113 is swingably supported about a swing shaft 113a provided at the lower portion.

[0111] A long hole 113b is formed in the upper portion of the swing member 113. A connecting shaft 114a is inserted into the long hole 113b. Similar to the internal and external air switching mechanism 100 (see FIG. 17 etc.), the connecting shaft 114a can move in an arc about the output shaft of the motor 114 via an arm (not shown) provided on the motor 114. By moving the connecting shaft 114a by the driving force of the motor 114, the swing member 113 can be swung left and right.

[0112] Long holes 111b and 112b are respectively formed in the external air opening and closing member 111 and the internal air opening and closing member 112. Connecting shafts 113c and 113d provided at the left and right end portions of the swing member 113 are respectively inserted into the long holes 111b and 112b.

[0113] In the internal and external air switching mechanism 110 configured as described above, when the outside air introduction state is selected, as shown in Fig. 19(a), the swing member 113 swings to the right. By this swing member 113, the internal air opening / closing member 112 is pushed down, and the internal air inlet 71b is closed by the internal air opening / closing member 112. On the other hand, the outside air opening / closing member 111 is pulled up, and the outside air inlet 71a is opened. Thus, in the outside air introduction state, outside air can be introduced through the outside air inlet 71a while preventing the inflow of air (internal air) from the internal air inlet 71b into the introduction part 71.

[0114] On the other hand, when the internal air circulation state is selected, as shown in Fig. 19(b), the swing member 113 swings to the left. By this swing member 113, the outside air opening / closing member 111 is pushed down, and the outside air inlet 71a is closed by the outside air opening / closing member 111. On the other hand, the internal air opening / closing member 112 is pulled up, and the internal air inlet 71b is opened. Thus, in the internal air circulation state, internal air can be introduced through the internal air inlet 71b while preventing the inflow of air (outside air) from the outside air inlet 71a into the introduction part 71.

[0115] As described above, in the internal and external air switching mechanism 110, the opening and closing of two opening / closing members (the outside air opening / closing member 111 and the internal air opening / closing member 112) can be performed using one drive source (the motor 114), and the configuration can be simplified.

[0116] Next, the resonator 120 constituted by the discharge part 75 will be described.

[0117] The resonator 120 shown in Figs. 20, 21, and 22 is for reducing the noise (stuffiness noise) in the cabin 10. The resonator 120 is constituted by the left part of the discharge part 75 (the part where the internal air inlet 75a is formed). The resonator 120 is provided with a cover member 121, a partition member 122, an opening / closing member 123, a seal member 124, etc.

[0118] The cover member 121 shown in FIGS. 13 and 22 covers the inner air inlet 75a from the indoor side of the cabin 10. On the indoor side surface of the inner roof 31, a recess 31b is formed so as to recess the periphery of the inner air inlet 75a. The cover member 121 is arranged to cover a part of the recess 31b from the indoor side of the cabin 10. In the present embodiment, the cover member 121 is arranged from the left end portion to the vicinity of the right end portion of the recess 31b (on the right side of the right end portion of the inner air inlet 75a). As a result, most of the recess 31b is blocked by the cover member 121, but the right end portion of the recess 31b is open to the indoor side of the cabin 10. The cover member 121 is arranged to be flush with the lower surface of the inner roof 31 (the surface around the recess 31b). Thus, the cover member 121 can cover the inner air inlet 75a while not impairing the appearance of the interior of the cabin 10.

[0119] The partitioning member 122 shown in FIGS. 20, 21, and 22 is for partitioning the discharge portion 75. The partitioning member 122 is formed with an upper surface portion 122a that covers the discharge portion 75 from above by bending a flat plate-like member, and side surface portions 122b that partition the discharge portion 75 left and right. The upper surface portion 122a can cover the left portion of the discharge portion 75 from above. The side surface portions 122b can partition the discharge portion 75 into a left portion (the portion where the inner air inlet 75a is formed) and a right portion (the portion where the inner air outlet 75b is formed). An opening 122c penetrating the side surface portion 122b is formed in the side surface portion 122b. The partitioning member 122 is arranged to partition the left and right portions of the discharge portion 75 and is fixed to the upper surface of the inner roof 31. Also, 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 partitioning member 122 (upper surface portion 122a).

[0120] The opening / closing member 123 is a member that can open and close the opening 122c of the partitioning member 122. The opening / closing member 123 is formed of a material having elasticity 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 arranged to close the opening 122c from the right side of the side surface portion 122b. The upper end portion of the opening / closing member 123 is fixed to the side surface portion 122b by an appropriate fixture (such as a screw). Thus, when a force (air pressure) equal to or greater than a predetermined value is applied to the opening / closing member 123 toward the right, the opening / closing member 123 elastically deforms, the lower portion of the opening / closing member 123 separates from the side surface portion 122b, and the opening 122c is opened. On the other hand, even when a force is applied to the opening / closing member 123 toward the left, the opening / closing member 123 is pressed against the side surface portion 122b, and the opening 122c is not opened.

[0121] In this way, the partitioning member 122 and the opening / closing member 123 constitute a rectifying mechanism 125 that allows air to flow only in one direction (from left to right).

[0122] With the discharge portion 75 (resonator 120) configured as described above, the noise in the cabin 10 can be reduced. Specifically, the sound that has entered from the inner air inlet 75a into the left portion of the discharge portion 75 (inside the partitioning member 122) is resonated inside the partitioning member 122, and air friction is generated near the inner air inlet 75a, so that the energy of the sound in the cabin 10 can be absorbed. By appropriately adjusting the volume inside the resonator 120, noise of a specific frequency can be effectively suppressed.

[0123] In the present embodiment, an example in which the resonator 120 is configured by the concave discharge portion 75 formed in the inner roof 31 has been shown, but the present invention is not limited to this. For example, it is also possible to form a concave resonator on the lower surface of the outer roof 32, or to form concave resonators on both the inner roof 31 and the outer roof 32.

[0124] In addition, in the present embodiment, an example in which the resonator 120 is formed at the right rear part of the roof 30 has been shown. However, the present invention is not limited to this, and the resonator 120 can be formed at any position. For example, it can also be arranged at the left rear part of the roof 30 or at the front part of the roof 30 (front side of the center in the front-rear direction). In this case, it is desirable to select a position that does not interfere with the other duct 70 so as not to inhibit the function of the other duct 70.

[0125] In addition to the roof 30, a separate resonator may be provided. For example, as shown in FIG. 1, a lower resonator 13 can 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 corresponding to the respective resonators different, the noise in the cabin 10 can be more effectively reduced.

[0126] In addition, the discharge part 75 has a function not only as the resonator 120 but also as an inner air damper that suppresses an increase in the pressure inside the cabin 10. For example, when the pressure inside the cabin 10 increases when the door 41 is closed or the like, the opening and closing member 123 is elastically deformed to the right by the pressure, and the opening 122c is opened. When the opening 122c is opened, the air inside the cabin 10 is discharged to the outside through the discharge part 75, the inner air discharge port 75b, and the right rear pillar 22R. Thereby, an increase in the pressure inside the cabin 10 can be suppressed.

[0127] Next, a seal structure for preventing water from entering the cabin 10 or the roof 30 will be described.

[0128] As shown in FIG. 15, a first seal member 130 is provided between the roof 30 and the cabin frame 20 so that water does not enter the interior of the cabin 10 from the outside. Hereinafter, the configuration regarding the arrangement of the first seal member 130 will be described by taking the cross-sectional structure in the middle of the left side beam 25L as shown in FIG. 15 as an example.

[0129] On the lower surface of the inner roof 31, a concave first seal accommodating portion 131 for accommodating the first seal member 130 is formed. The first seal accommodating portion 131 is formed along the cabin frame 20 on which the inner roof 31 is placed. That is, 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. Thereby, the first seal accommodating portion 131 is formed so as to extend in a substantially rectangular annular shape in plan view.

[0130] The first seal accommodating portion 131 is formed to be located inside the outer edge of the upper surface 132 of the left side beam 25L. That is, the outer edge in the width direction (the left-right direction in FIG. 15) of the first seal accommodating portion 131 is located inside the outer edge in the width direction of the upper surface 132 of the left side beam 25L. Particularly in the present embodiment, the inner edge in the width direction of the first seal accommodating portion 131 is also located outside 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 plan view. Thereby, the first seal accommodating portion 131 is blocked from below by the upper surface 132 of the left side beam 25L.

[0131] Although FIG. 15 shows an example of the left side beam 25L, 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 the front beam 23, the right side beam 25R, and the rear beam 24 in plan view, and is blocked from below by the front beam 23 and the like.

[0132] The first seal member 130 has a rectangular cross-section and is formed in a hollow shape. The first seal member 130 is formed of an elastic member such as rubber, for example. The first seal member 130 is housed in the first seal housing portion 131 and is arranged along the extending direction of the first seal housing portion 131. That is, the first seal member 130 is arranged in a substantially rectangular ring shape in plan view along the upper part 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.

[0133] Due to the first seal member 130 configured as described above, the gap between the cabin frame 20 and the inner roof 31 is sealed, so that it is possible to prevent water from entering the interior of the cabin 10 from the gap. In particular, in the present embodiment, the first seal housing portion 131 is closed from below by the cabin frame 20 (the left side beam 25L). Therefore, even when water is sprayed from below when washing the tractor 1, it is possible to make it difficult for water to directly enter the first seal housing portion 131. Thereby, the sealing performance between the cabin frame 20 and the inner roof 31 can be effectively improved.

[0134] Further, as shown in FIG. 15, a second seal member 140 is provided between the inner roof 31 and the outer roof 32 so that water does not enter the roof 30 from the outside. Hereinafter, the configuration regarding the arrangement of the second seal member 140 will be described by taking the cross-sectional structure at the middle part of the left side beam 25L as shown in FIG. 15 as an example.

[0135] On the upper surface of the inner roof 31, a first inclined portion 141 inclined downward from the outer edge side of the inner roof 31 toward the inside, a second inclined portion 142 inclined upward toward the inside of the inner roof 31, and a second seal housing portion 143 in which the second seal member 140 is housed are formed.

[0136] The first inclined portion 141 and the second inclined portion 142 are formed over the entire circumference of the outer edge portion of the inner roof 31. The second inclined portion 142 is formed so as to be adjacent to the inner side of the first inclined portion 141. The first inclined portion 141 and the second inclined portion 142 formed in this way form a groove having a substantially V-shaped cross section. On the outer edge portion of the outer roof 32, an inclined portion 144 is formed along 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 vertically. Thereby, the gap between the inner roof 31 and the outer roof 32 is covered from below by the first inclined portion 141.

[0137] Further, the first inclined portion 141 is formed so as to incline downward toward the corner portion of the roof 30 formed in a substantially rectangular shape in plan view. For example, as shown in FIG. 23, the first inclined portion 141 formed on the left side portion of the inner roof 31 is formed so as to incline downward from the substantially central portion in the front-rear direction of the inner roof 31 toward both the front and rear sides (the front and rear corner portions of the roof 30). Although illustration is omitted, the same applies to the first inclined portion 141 formed on the right side portion of the inner roof 31. Further, as shown in FIG. 9, the first inclined portion 141 formed on the rear side portion of the inner roof 31 is formed so as to incline downward from the substantially central portion in the left-right direction of the inner roof 31 toward both the left and right sides (the left and right corner portions of the roof 30). Although illustration is omitted, the same applies to the first inclined portion 141 formed on the front side portion of the inner roof 31.

[0138] The second seal accommodation part 143 is formed inside the second inclined part 142. The second seal accommodation part 143 is also formed over the entire circumference of the inner roof 31. The second seal accommodation part 143 is formed in an annular shape in plan view so as to surround the internal space of the roof 30 (the duct 70 and the space where various devices are arranged) from the outside. The second seal accommodation part 143 is formed in a shape that can secure a space for accommodating the second seal member 140. The second seal accommodation part 143 of the present embodiment is formed by forming the upper surface of the inner roof 31 in a stepped shape, but for example, it is also possible to form the upper surface of the inner roof 31 in a concave shape that is recessed downward.

[0139] The second seal member 140 has a rectangular cross section and is formed in a hollow shape. The second seal member 140 is formed of an elastic member such as rubber, for example. The second seal member 140 is accommodated in the second seal accommodation part 143 and is arranged along the extending direction of the second seal accommodation part 143. That is, the second seal member 140 is arranged over the entire circumference 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.

[0140] Due to the second seal member 140 configured as described above, the gap between the inner roof 31 and the outer roof 32 is sealed, so that it is possible to prevent water from entering the roof 30 from the gap. In particular, in the present embodiment, the gap between the inclined part 144 of the outer roof 32 and the second inclined part 142 of the inner roof 31 is covered from below by the first inclined part 141 of the inner roof 31. For this reason, even when water is sprayed from below when washing the tractor 1, etc., it is possible to make it difficult for water to directly enter the second seal accommodation part 143. Thereby, the sealing performance between the inner roof 31 and the outer roof 32 can be effectively improved.

[0141] In this embodiment, the 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, the water on the roof 30 (for example, rainwater, water used for car washing, etc.) flows toward the outer edge side 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 corner of the roof 30 along the inclination of the first inclined portion 141 as indicated by the dashed line in the figure, and falls downward from the corner of the roof 30. By guiding the water in this way, the water can be dropped from a position that does not obstruct the driver's view (near each pillar of the cabin 10), so that the comfort of the driver can be improved.

[0142] Next, the work lamp 33 provided on the roof 30 will be described.

[0143] The work lamp 33 shown in FIGS. 2 and 4 is for lighting to illuminate the front and rear of the cabin 10. The work lamp 33 is provided on the left and right of the rear part of the roof 30 and on the left and right of the front part of the roof 30, respectively. The work lamp 33 of this embodiment is fixed to the roof 30 instead of the cabin frame 20. Hereinafter, taking the work lamp 33 provided on the left rear part of the roof 30 as an example, the mounting structure of the work lamp 33 will be described.

[0144] As shown in FIGS. 9 and 24, the work lamp 33 is provided with a fixing portion 33a for fixing to the roof 30. The fixing portion 33a is composed of a plate-like member bent in a U shape in a rear view. The work lamp 33 is disposed below the left rear part of the inner roof 31. In this state, a bolt 151 is inserted into the fixing portion 33a from below. The upper part of the bolt 151 is inserted into the inner roof 31. The upper part 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. Further, an elastic member 153 for protecting the inner roof 31 is disposed between the bolt 151 and the nut 152.

[0145] As shown in FIG. 25, the nut 152 is provided with a locking portion 152a that extends laterally from the portion through which the bolt 151 is inserted. The locking portion 152a is arranged to be located within a groove portion 154 formed on the upper surface of the inner roof 31. The groove portion 154 is formed, for example, between a pair of convex portions 155 formed so as to bulge upward from the upper surface of the inner roof 31. By locking the locking portion 152a with the groove portion 154, rotation of the nut 152 can be prevented.

[0146] Thus, in this embodiment, the work lamp 33 can be directly fixed to the roof 30 (inner roof 31) instead of to a skeletal member such as the cabin frame 20. Further, by locking the nut 152 with the groove portion 154, it is possible to prevent the nut 152 from rotating when fastening the bolt 151, and the attachment work of the work lamp 33 can be easily performed.

[0147] Although the work lamp 33 provided at the left rear portion of the roof 30 has been described, the other work lamps 33 are also fixed to the roof 30 by a similar attachment structure.

[0148] As described above, the cabin 10 for the tractor 1 (work vehicle) according to one aspect of the present disclosure is an inner roof 31 that constitutes the ceiling inside the cabin, an outer roof 32 provided above the inner roof 31, and the cabin 10 for the tractor 1, comprising: at least one of the upper surface of the inner roof 31 or the lower surface of the outer roof 32 is formed in a concave shape, and a duct 70 for guiding air flowing into the cabin or air flowing out of the cabin is formed (see FIG. 12). By configuring in this way, it is possible to reduce the number of parts. That is, by forming the duct 70 in the roof 30 itself, there is no need to separately provide a duct component. Thereby, reduction of the number of parts, cost, space saving, etc. can be achieved.

[0149] Further, the duct 70 includes a first guiding portion 72 capable of guiding air in the front-rear direction, and second guiding portions 74 respectively formed on the left and right sides of the first guiding portion 72 and capable of guiding the air guided by the first guiding portion 72 into the cabin interior. It includes these. By configuring in this way, a suitable duct 70 can be formed. That is, by forming the second guiding portions 74 on the left and right sides of the first guiding portion 72, it becomes easy to equalize the flow rate of the air branched from the first guiding portion 72 to the second guiding portions 74.

[0150] It further includes a cabin frame 20 that constitutes the framework of the cabin 10, and the duct 70 further includes an introduction portion 71 capable of guiding the air introduced from the outside through the cabin frame 20 to the first guiding portion 72. By configuring in this way, outside air can be introduced into the duct 70 through the cabin frame 20. Thereby, effective utilization (utilization as an air circulation path) of the cabin frame 20 can be achieved.

[0151] Also, the cabin frame 20 includes a pair of left and right rear pillars (left rear pillar 22L and right rear pillar 22R) provided at the rear, and the introduction portion 71 is capable of guiding the air introduced from the outside through either one of the pair of left and right rear pillars. By configuring in this way, effective utilization of the rear pillars (left rear pillar 22L and right rear pillar 22R) can be achieved.

[0152] Also, the introduction portion 71 is capable of guiding the air introduced from the cabin interior to the first guiding portion 72. By configuring in this way, the air (inside air) in the cabin interior can be circulated.

[0153] Further, 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 the outside to the introduction part 71 and an inside air circulation state in which air can be introduced from the inside of the cabin to the introduction part 71. With this configuration, the outside air introduction state and the inside air circulation state can be appropriately switched.

[0154] Further, the duct 70 further includes a discharge part 75 that can guide the air in the cabin to the outside. With this configuration, by effectively utilizing the roof 30, the air in the cabin can be discharged to the outside.

[0155] Further, the discharge part 75 can guide the air in the cabin to any one of the pair of left and right rear pillars (left rear pillar 22L and right rear pillar 22R). With this configuration, the inside air can be discharged through the rear pillars (left rear pillar 22L and right rear pillar 22R).

[0156] Further, the discharge part 75 constitutes a resonator 120 that can reduce the noise in the cabin. With this configuration, by effectively utilizing the discharge part 75, the noise in the cabin can be reduced.

[0157] Further, as described above, the cabin 10 for the tractor 1 (work vehicle) according to one aspect of the present disclosure includes a cabin frame 20, an inner roof 31 that is fixed to the cabin frame 20 and constitutes a ceiling facing the inside of the cabin, and an outer roof 32 provided above the inner roof 31, and is a cabin 10 for the tractor 1, on the upper surface of the inner roof 31, A duct 70 is formed in a concave shape to guide air flowing into the cabin interior or air flowing out of the cabin interior. Inside the duct 70, a fastening member 31a (first fixing member) for fixing the inner roof 31 to the cabin frame 20 is provided (see Fig. 15). By configuring in this way, a wide space can be secured between the inner roof 31 and the outer roof 32. That is, instead of providing the fastening member 31a while avoiding the duct 70, by arranging the fastening member 31a inside the duct 70, it becomes unnecessary to separately secure a space for arranging the fastening member 31a, so a wide space can be secured between the inner roof 31 and the outer roof 32.

[0158] Also, 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 plan view. The duct 70 is formed such that at least a part thereof is located outside the upper beam in plan view. By configuring in this way, the duct 70 can be arranged up to the outside of the upper beam, and the degree of freedom in design can be increased.

[0159] Also, on the lower surface of the inner roof 31 a concave first seal accommodating portion 131 (accommodating portion) formed inside the outer edge of the upper beam is formed. In the first seal accommodating portion 131 a first seal member 130 (seal member) for sealing between the inner roof 31 and the upper beam is arranged. By configuring in this way, the sealing performance between the inner roof 31 and the upper beam can be improved. In particular, by forming the first seal accommodating 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, and the sealing performance can be effectively improved.

[0160] Further, on the upper surface of the inner roof 31, a first inclined portion 141 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 inclined upward toward the inside of the inner roof 31 inside the inner roof 31 from the first inclined portion 141 are formed, and the outer roof 32 is arranged so as to cover the second inclined portion 142 from above. By configuring in this way, the sealing performance between the inner roof 31 and the outer roof 32 can be improved. That is, by inclining the first inclined portion 141, for example, water for car washing from below can be made difficult to enter between the inner roof 31 and the outer roof 32.

[0161] Further, the inner roof 31 is formed in a substantially rectangular shape in plan view, and the first inclined portion 141 is formed so as to incline downward toward the corner portion of the inner roof 31 in plan view (see FIGS. 9 and 23). By configuring in this way, water can be guided to the corner portion of the inner roof 31 using the first inclined portion 141, and it can be prevented that the falling water hinders the driver's view and work.

[0162] Further, the cabin 10 further includes a work lamp 33 fixed to the inner roof 31 (see FIG. 24). By configuring in this way, by directly attaching the work lamp 33 to the inner roof 31, simplification of the attachment structure of the work lamp 33 can be achieved.

[0163] Further, the cabin 10 Inside the duct 70, a nut 152 (second fixture) for fixing the work lamp 33 to the inner roof 31 is provided. With this configuration, the duct 70 can be effectively utilized to attach the work lamp 33.

[0164] Also, as described above, the cabin 10 for the tractor 1 (work vehicle) according to one aspect of the present disclosure includes an inner roof 31 that constitutes the ceiling inside the cabin, and an outer roof 32 provided above the inner roof 31, and is a cabin 10 for the tractor 1 including at least one of the upper surface of the inner roof 31 or the lower surface of the outer roof 32 is formed in a concave shape, and a resonator 120 capable of reducing the noise inside the cabin is formed (see FIG. 20 etc.). With this configuration, the noise inside the cabin 10 can be reduced. Also, the space between the inner roof 31 and the outer roof 32 can be effectively utilized.

[0165] Also, at least one of the upper surface of the inner roof 31 or the lower surface of the outer roof 32 is formed in a concave shape, and a duct 70 (discharge portion 75) for guiding the air flowing out from the inside of the cabin is formed, and the resonator 120 is formed in the middle of the duct 70. With this configuration, the duct 70 can be effectively utilized to constitute the resonator 120.

[0166] Also, in the middle of the duct 70, a rectifying mechanism 125 is further provided that allows the air to flow in the first direction flowing out from the inside of the cabin and inhibits the air from flowing back in the second direction into the cabin. By configuring in this way, it is possible to suppress the pressure rise inside the cabin 10. As a result, it is possible to easily close the door 41 and the rear panel 42.

[0167] Further, the rectifying mechanism 125 includes a partitioning member 122 that partitions the duct 70 (discharge portion 75), and an opening / closing member 123 (elastic member) that is disposed so as to close the opening 122c formed in the partitioning member 122 and opens the opening 122c as air flows in the first direction. It is provided with. By configuring in this way, the rectifying mechanism 125 can be simply configured.

[0168] Further, in the inner roof 31, a recess 31b formed at a position facing the cabin interior, and an inner air inlet 75a (through hole) formed in the recess 31b and communicating the cabin interior with the resonator 120 are formed. By configuring in this way, the recess 31b can guide air to the inner air inlet 75a.

[0169] Further, the cabin 10 further includes a cover member 121 disposed so as to cover the inner air inlet 75a from the cabin interior side. By configuring in this way, the cover member 121 can cover and hide the inner air inlet 75a, and the aesthetics inside the cabin can be improved.

[0170] Further, the resonator 120 is formed at the rear of the inner roof 31 or the outer roof 32. By configuring in this way, the space at the rear of the roof 30 can be effectively utilized.

[0171] Also, as described above, the cab 10 for the tractor 1 (work vehicle) according to one aspect of the present disclosure is a cab 10 for a tractor 1 having a roof 30 in which a duct 70 for guiding air is formed, a left rear pillar 22L (rear pillar) provided at the rear part of the cab 10 and capable of guiding outside air to the roof 30, a filter 61 for purifying the outside air introduced into the left rear pillar 22L, a filter housing portion 62 for housing the filter 61, a first cover member 63 for covering the filter housing portion 62 from the outdoor side, and includes (see FIG. 6 and the like). By configuring in this way, the filter 61 can be suitably arranged. That is, by covering the filter housing portion 62 in which the filter 61 is housed with the first cover member 63, the filter 61 can be arranged while suppressing a decrease in aesthetic appearance. Further, by providing the first cover member 63, it is possible to make it difficult for dust and water to enter the filter 61.

[0172] Also, the cab 10 further includes a second cover member 64 for covering the filter housing portion 62 from the outdoor side. By configuring in this way, it is possible to make it more difficult for dust and water to enter the filter 61.

[0173] Also, the filter housing portion 62 has an opening 62b through which outside air can flow, the first cover member 63 and the second cover member 64 are arranged so that at least a part thereof overlaps when viewed from the flow direction of the outside air flowing through the opening 62b (in this embodiment, the direction perpendicular to the introduction surface 62a). By configuring in this way, it is possible to make it difficult for water and dust from the outside to reach the filter 61. Thereby, it is possible to suppress the dirt and deterioration of the filter 61.

[0174] Also, the first cover member 63 It is arranged so as to cover at least the filter housing portion 62 from the rear, The second cover member 64, is arranged so as to cover at least the filter housing portion 62 from the side. By configuring in this way, the filter housing portion 62 can be covered and hidden from a plurality of directions. Thereby, deterioration of the filter 61 and the like can be effectively suppressed.

[0175] Further, the first cover member 63 and the second cover member 64 are formed of different materials. By configuring in this way, improvement in aesthetics can be achieved due to the difference in materials.

[0176] Further, the first cover member 63 is formed of a resin material, and the second cover member 64 is formed of a metal material. By configuring in this way, improvement in aesthetics can be achieved due to the difference in materials.

[0177] Further, the first cover member 63 is provided with a rear combination lamp 63c (lamp). By configuring in this way, the rear combination lamp 63c can be integrated with the first cover member 63, and component management can be easily performed.

[0178] Further, the first cover member 63 is provided with a lifting operation tool 63d (operation tool) of the lifting device 9 of the tractor 1. By configuring in this way, it is possible to easily operate the lifting device 9 from the outside.

[0179] Note that the tractor 1 according to the present embodiment is one form of implementation of a work vehicle. Further, the left rear pillar 22L and the right rear pillar 22R according to the present embodiment are one form of implementation of a rear pillar. Also, the fastener 31a according to the present embodiment is an embodiment of the first fixture. Also, the front beam 23, rear beam 24, left side beam 25L, and right side beam 25R according to the present embodiment are embodiments of the upper beam. Also, the first seal accommodation portion 131 according to the present embodiment is an embodiment of the accommodation portion. Also, the first seal member 130 according to the present embodiment is an embodiment of the seal member. Also, the nut 152 according to the present embodiment is an embodiment of the second fixture. Also, the opening / closing member 123 according to the present embodiment is an embodiment of the elastic member. Also, the inside air inlet 75a according to the present embodiment is an embodiment of the through-hole. Also, the rear combination lamp 63c according to the present embodiment is an embodiment of the lamp. Also, the lifting operation tool 63d according to the present embodiment is an embodiment of the operation tool.

[0180] As described above, one embodiment of the present invention has been described. However, 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.

[0181] For example, in the above embodiment, the tractor 1 is described as an example of the work vehicle, but other agricultural vehicles, construction vehicles, industrial vehicles, etc. may also be used.

[0182] Also, the configurations (shape, size, number, etc.) of the respective members described in the above embodiment are not limiting, and can be arbitrarily changed.

[0183] In addition, in this embodiment, a configuration for introducing outside air into the roof 30 through the left rear pillar 22L and a configuration for discharging inside air to the outside through the right rear pillar 22R have been described. However, the present invention is not limited to this. For example, a configuration for introducing outside air into the roof 30 through the right rear pillar 22R and a configuration for discharging inside air to the outside through the left rear pillar 22L are also possible. Further, not limited to the rear pillars (left rear pillar 22L and right rear pillar 22R), it is also possible to adopt a configuration in which air is circulated through other members constituting the cabin frame 20 (for example, left front pillar 21L, right front pillar 21R, etc.).

[0184] In addition, the shape of the duct 70 described in this embodiment (see FIG. 12) is an example and can be arbitrarily changed. For example, the number of branches of the duct 70 can be increased or decreased, or the cross-sectional shape can be arbitrarily changed.

[0185] In addition, the arrangement of various devices in the roof 30 is not limited and can be arbitrarily changed. For example, the air conditioner unit 92 can be arranged at the rear of the roof 30. Further, the blower 91 and the air conditioner unit 92 can be arranged adjacent to each other (or directly connected).

Explanation of Signs

[0186] 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 Lamp 61 Filter 62 Filter Housing 63 First Cover Member 64 Second Cover Member 70 Duct 71 Introduction Part 72 First Guide Part 74 Second Case Interior 75 Discharge Section 100 Inside-Outside Air Switching Mechanism 120 Resonator 125 Rectifying Mechanism

Claims

1. An inner roof that constitutes the ceiling inside the cabin, An outer roof provided above the inner roof, A cabin for a work vehicle comprising: On at least one of the upper surface of the inner roof or the lower surface of the outer roof, There is formed a duct that is formed in a concave shape and guides air flowing into the cabin or air flowing out of the cabin. A cabin for a work vehicle.

2. The duct is: A first guide part capable of guiding air in the front-rear direction, Second guide parts respectively formed on the left and right of the first guide part and capable of guiding the air guided by the first guide part into the cabin, Including: The cabin for a work vehicle according to Claim 1.

3. Further comprising a cabin frame that constitutes the framework of the cabin, The duct is: Further including an introduction part capable of guiding air introduced from the outside through the cabin frame to the first guide part. The cabin for a work vehicle according to Claim 2.

4. The cabin frame includes: A pair of left and right rear pillars provided at the rear, The introduction part is: Capable of guiding air introduced from the outside through either one of the pair of left and right rear pillars. The cabin for a work vehicle according to Claim 3.

5. The introduction part is: Capable of guiding air introduced from the cabin interior to the first guide part. The cabin for a work vehicle according to Claim 4.

6. Further comprising an internal and external air switching mechanism capable of switching between an external air introduction state in which air can be introduced from the outside to the introduction part and an internal air circulation state in which air can be introduced from the cabin interior to the introduction part. The cabin for a work vehicle according to Claim 5.

7. The duct further includes a discharge part capable of guiding the air inside the cabin to the outside. The cabin for a work vehicle according to Claim 6.

8. The discharge part is: Capable of guiding the air inside the cabin to either one of the pair of left and right rear pillars. The cabin for a work vehicle according to Claim 7.

9. The discharge part is: Constitutes a resonator capable of reducing the noise inside the cabin. The cabin for a work vehicle according to Claim 7.

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