JP6346001B2 - Tractor - Google Patents

Description

The present invention relates to a farm tractor .

  2. Description of the Related Art Conventionally, work vehicles such as agricultural tractors include a cabin that covers a control seat on a traveling machine body (see, for example, Patent Documents 1 and 2). The cabins described in Patent Literatures 1 to 3 have a cabin frame that constitutes a framework, and a roof body that is disposed on the upper end side of the cabin frame. The cabin frame has a so-called frame structure in which a pillar (pillar) and a beam member (beam) are combined, and rigidity is secured by the pillar and the beam member.

JP 2002-67657 A JP 2004-345367 A

  By the way, regarding the structure of this type of cabin, there is a strong demand not only for cost reduction but also for ease of boarding and improvement of comfort inside the cabin. For example, it is desired to manage farming comfortably by managing air conditioning in the cabin or reducing noise in the cabin.

  This invention makes it a technical subject to provide the working vehicle which examined and improved the above present condition.

The invention of claim 1 includes a cabin frame that forms a framework of a cabin that covers a control seat on a traveling body, and a roof body that is disposed on an upper end side of the cabin frame, and the cabin frame includes a pair of left and right front columns. A pair of left and right rear struts, a front beam member that connects the upper ends of the front columns, a rear beam member that connects the upper ends of the rear columns, the front column and the rear that are arranged in the front and rear direction and a side beam member for connecting the upper end of the strut, the at tractor supporting the roof member in the group of the beam member, the left and right extending to the rear beam member and the longitudinal direction extending horizontally above Each of the side beam members is formed in a C-shaped cross section, and a reinforcing plate extending along the respective longitudinal direction is fitted into and fixed to the openings of the rear beam member and the side beam member, thereby fixing the rear beam member. A small number of beam members and side beam members Both of the longitudinal intermediate portions are formed in a hollow shape, and the left and right end surfaces of the rear beam member and the rear end surface of the side beam member are fixed to the upper end side surface of the rear column, while the rear beam member and the left and right side beam members are fixed. A pair of left and right brace-like reinforcing brackets are fixed to the inner side of the inner wall, and the presence of the reinforcing brackets ensures the connection strength of the rear beam member, the left and right side beam members, and the rear column. In addition, the interior of the roof body is divided into two front and rear chambers, the rear chamber of the roof body protrudes rearward from the rear beam member, the rear chamber is supported by the rear beam member, and the rear chamber is The air conditioner is housed.

According to a second aspect of the present invention, in the tractor according to the first aspect, the left and right side portions of the roof body are provided with tail pipes that discharge exhaust gas from an engine mounted on the traveling body to the outside. An outside air intake port that communicates the rear chamber with the outside is formed on the opposite side of the tail pipe, and the outside air inlet port is the outside air of the left and right side walls of the rear cover that forms the rear chamber. Facing the air conditioner in the rear cover through a communication port formed on the side wall portion closer to the intake port, a ventilation frame is attached to the outside air intake port, and a dust filter is attached to the communication port. attaching one, those that the the rear side of the inner roof facing the back of the head of an operator who sits on control seat forms an inside air intake port in communication with said cabin and said rear cover A.

According to the present invention, it comprises a cabin frame that constitutes a framework of a cabin that covers a control seat on a traveling machine body, and a roof body that is disposed on the upper end side of the cabin frame, and the cabin frame includes a pair of left and right front columns, A pair of left and right rear struts, a front beam member that connects the upper ends of the front struts, a rear beam member that connects the upper ends of the rear struts, the front struts and the rear struts arranged in front and rear A side beam member that connects between the upper ends of the roof body, and the roof vehicle is supported by the group of beam members, the interior of the roof body is divided into two front and rear chambers, The rear chamber protrudes rearward from the rear beam member, the rear chamber is supported by the rear beam member, and the air conditioner is accommodated in the rear chamber, so that the total height of the cabin is not increased. The air conditioner can be placed inside the roof Both can be avoided the problem of limiting the operator's forward view for example to accommodate the air conditioner in the front chamber of the roof body. Moreover, since the said rear chamber and the said front chamber which accommodate the said air conditioner are divided, it is easy to aim at the sealing performance of the said rear chamber. This also contributes to an improvement in workability of the air conditioner.

  According to a second aspect of the present invention, the tail pipe for releasing the exhaust gas of the engine mounted on the traveling machine body to the outside is provided on one of the left and right sides of the traveling machine body, and the side of the roof body opposite to the tail pipe is provided. In addition, since the outside air intake port that communicates the rear chamber with the outside is formed, it is possible to remarkably prevent the exhaust gas from the tail pipe from being taken into the outside air intake port.

It is a left view of a tractor. It is a top view of a tractor. It is a right view of a tractor. It is the perspective view which looked at the tractor from diagonally right back. It is left side explanatory drawing of a traveling body. It is left side explanatory drawing which shows the detailed structure of a traveling body. It is the perspective view which looked at the traveling body from diagonally left rear. It is right side explanatory drawing of a traveling body. It is right side explanatory drawing which shows the detailed structure of a traveling body. It is the perspective view which looked at the traveling machine body from diagonally right rear. It is a left view of a cabin. It is a top view of a cabin. It is a front view of a cabin. It is a right view of a cabin. It is a rear view of a cabin. It is a bottom view of a cabin. It is a left view of a cabin frame. It is a top view of a cabin frame. It is a front view of a cabin frame. It is a right view of a cabin frame. It is a rear view of a cabin frame. It is the perspective view which looked at the cabin frame from diagonally left front. It is the perspective view which looked at the cabin frame from diagonally left rear. It is the perspective view which looked at the anti-vibration support structure of the cabin from diagonally left front. It is the perspective view which looked at the anti-vibration support structure of the cabin from diagonally right rear. It is an expansion perspective view of a right front support | pillar and a front beam member. It is an expansion perspective view of a right back support and a back beam member. It is a top view of a roof body. It is a perspective view which shows an inner roof. (A) is an enlarged sectional view of the front beam member, (b) is an enlarged sectional view of the rear beam member, (c) is an enlarged sectional view of the right beam member, and (d) is an enlarged sectional view of the left beam member. (A) is explanatory drawing which shows the connection structure of a front beam member, a left beam member, and a left front support | pillar, (b) is explanatory drawing which shows the connection structure of a front beam member, a right beam member, and a right front support | pillar. (A) is explanatory drawing which shows the connection structure of a rear beam member, a left beam member, and a left rear support | pillar, (b) is explanatory drawing which shows the connection structure of a rear beam member, a right beam member, and a right rear support | pillar. (A) is a side view of a base bracket, (b) is a rear perspective view of the base bracket. It is a left view of the cabin which shows the structure of a reinforcement frame. It is an inner surface figure of the left side door which shows the structure of a reinforcement frame. It is an expansion perspective view of the cabin frame which shows the attachment structure of a hinge. It is a plane sectional view of a hinge. It is a rear view of a rear glass. It is an internal view of a rear glass. It is a perspective view of a rotary handle and a locked block. It is a plane sectional view of a rotation type handle and a locked block. It is an enlarged rear view of a cabin. It is an expansion perspective view of the cabin frame back side. It is an expanded side sectional view of an inside air discharge part. It is a front perspective view of a board support plate. It is a perspective view of an engine and a cabin viewed from the right front side. It is right side sectional drawing which shows the relationship between a board support plate, a brake pedal, and a brake valve. It is an expanded left side sectional view of a roof body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking a tractor as a work vehicle as an example.

  First, an outline of the tractor 1 will be described with reference to FIGS. The traveling machine body 2 of the tractor 1 in the embodiment is supported by a pair of left and right rear wheels 4 as well as a pair of left and right front wheels 3 as a traveling unit. The tractor 1 is configured to travel forward and backward by driving the rear wheels 4 and the front wheels 3 with a common rail type diesel engine 5 (hereinafter simply referred to as an engine) as a power source mounted on the front portion of the traveling machine body 2. Has been. The engine 5 is covered with a bonnet 6. A cabin 7 is installed on the upper surface of the traveling machine body 2. Inside the cabin 7, a steering seat 8 and a steering handle (round handle) that moves the steering direction of the front wheel 3 to the left and right by steering. 9 are arranged. Steps 10 on which the operator gets on and off are provided at the left and right lower portions of the cabin 7. A fuel tank 11 that supplies fuel to the engine 5 is provided below the bottom of the cabin 7.

  The traveling machine body 2 includes an engine frame 14 having a front bumper 12 and a front axle case 13, and left and right machine body frames 15 detachably fixed to a rear portion of the engine frame 14. A front axle 16 is rotatably protruded outward from the left and right ends of the front axle case 13. The front wheels 3 are attached to the left and right ends of the front axle case 13 via the front axle 16. A transmission case 17 is connected to the rear part of the body frame 15 for appropriately changing the rotational power from the engine 5 and transmitting it to the front and rear four wheels 3, 3, 4, 4. A tank frame 18 having a rectangular frame plate shape in a bottom view projecting outward in the left and right directions is bolted to the lower surface sides of the left and right body frames 15 and the mission case 17. The fuel tank 11 of the embodiment is divided into left and right. The left and right fuel tanks 11 are distributed and mounted on the upper surface side of the left and right projecting portions of the tank frame 18. The left and right rear axle cases 19 are mounted on the left and right outer surfaces of the mission case 17 so as to protrude outward. Left and right rear axle cases 20 are rotatably inserted in the left and right rear axle cases 19. The rear wheel 4 is attached to the mission case 17 via the rear axle 20. Upper portions of the left and right rear wheels 4 are covered with left and right rear fenders 21.

A hydraulic lifting mechanism 22 that lifts and lowers a working machine such as a rotary tiller is detachably attached to the rear upper surface of the mission case 17. Working machines such as rotary tillers
It is connected to the rear part of the mission case 17 through a three-point link mechanism comprising a pair of left and right lower links 23 and a top link 24. On the rear side surface of the mission case 17, a PTO shaft 25 for transmitting a PTO driving force to a working machine such as a rotary tiller is provided to project rearward.

  A flywheel 26 is attached to an engine output shaft (not shown) projecting rearward from the rear side surface of the engine 5. A main shaft 27 projecting rearward from the flywheel 26 and a main transmission input shaft 28 projecting forward from the front side of the transmission case 17 are connected via a power transmission shaft 29 having universal shaft joints at both ends. FIG. 1, FIG. 7 and FIG. 10). In the transmission case 17, a hydraulic continuously variable transmission, a forward / reverse switching mechanism, a traveling auxiliary transmission gear mechanism, and a differential gear mechanism for rear wheels are arranged. The rotational power of the engine 5 is transmitted to the main transmission input shaft 28 of the transmission case 17 via the main driving shaft 27 and the power transmission shaft 29, and is appropriately shifted by the hydraulic continuously variable transmission and the traveling auxiliary transmission gear mechanism. Then, the transmission power is transmitted to the left and right rear wheels 4 through the rear wheel differential gear mechanism.

  The front wheel output shaft 30 projecting forward from the lower front portion of the transmission case 17 projects rearward from the front axle case 13 containing a front wheel differential gear mechanism (not shown) via a front wheel drive shaft 31. A front wheel transmission shaft (not shown) is connected. Transmission power by the hydraulic continuously variable transmission and the traveling auxiliary transmission gear mechanism in the transmission case 17 is transmitted from the front wheel output shaft 30, the front wheel drive shaft 31, and the front wheel transmission shaft to the front wheel differential gear mechanism in the front axle case 13. Is transmitted to the left and right front wheels 3 via.

  Next, the internal structure of the cabin 7 will be described with reference to FIGS. A steering column 32 is disposed in front of the control seat 8 in the cabin 7. The steering column 32 is erected in a state of being embedded in the back side of the dashboard 33 disposed on the front side inside the cabin 7. A steering handle 9 having a substantially round shape in plan view is attached to the upper end side of the handle shaft that protrudes upward from the upper surface of the steering column 32.

  On the right side of the steering column 32, there is a one-touch lift lever 34 for forcibly moving a working machine such as a rotary tiller to the highest position or the lowest position, and a pair of left and right brake pedals 35 for braking the traveling machine body 2. And are arranged. On the left side of the steering column 32, a forward / reverse switching lever 36 (reverser lever) for switching the traveling direction of the traveling machine body 2 between forward and reverse and a power transmission clutch (not shown) are disconnected. A clutch pedal 37 is provided.

  An erroneous operation preventing body 38 (reverser guard) extending along the forward / reverse switching lever 36 is disposed on the left side of the steering column 32 and below the forward / reverse switching lever 36. By disposing an erroneous operation prevention body 38 as a contact preventer below the forward / reverse switching lever 36, the operator is prevented from inadvertently contacting the forward / reverse switching lever 36 when getting on and off the tractor 1. An operation display panel 39 incorporating a liquid crystal panel is provided on the upper rear side of the dashboard 33.

An accelerator pedal 41 that controls the rotational speed or the vehicle speed of the engine 5 is disposed on the right side of the steering column 32 in the floor plate 40 in front of the control seat 8 in the cabin 7. Note that substantially the entire top surface of the floor plate 40 is formed as a flat surface. Side columns 42 are arranged on both the left and right sides of the control seat 8. Between the control seat 8 and the left side column 42, the parking brake lever 43 for executing the operation of maintaining the left and right rear wheels 4 in a braking state and the traveling speed (vehicle speed) of the tractor 1 are forcibly greatly increased. An ultra-low speed lever 44 (creep lever) to be reduced, a sub-shift lever 45 for switching the output range of the traveling sub-transmission gear mechanism in the transmission case 17, and a PTO shift for switching the driving speed of the PTO shaft 25 Lever 46
And are arranged. A differential lock pedal 47 for turning on / off the differential drive of the left and right rear wheels 4 is disposed below the control seat 8. A reverse PTO lever 48 that performs an operation of driving the PTO shaft 25 in the reverse direction is disposed on the left rear side of the control seat 8.

  Between the control seat 8 and the left side column 42, an armrest 49 for placing the arm and elbow of the operator seated on the control seat 8 is provided. The armrest 49 is configured separately from the control seat 8 and has a main transmission lever 50 that increases and decreases the traveling speed of the tractor 1 and a dial type that manually changes and adjusts the height position of a work machine such as a rotary tiller. A working part position dial 51 (elevating dial) is provided. In addition, the armrest 49 is configured to be able to be turned up and rotated in a plurality of stages with the rear end lower part as a fulcrum.

  The left side column 42 includes, in order from the front side, a throttle lever 52 that sets and maintains the rotational speed of the engine 5, and a PTO clutch switch 53 that performs intermittent operation of power transmission from the PTO shaft 25 to a working machine such as a rotary tiller. A plurality of hydraulic operation levers 54 (SCV levers) for switching the hydraulic external take-off valve 430 (sub-control valve, see FIG. 42) arranged on the upper surface side of the mission case 17 are arranged. Here, the hydraulic external take-off valve is for supplying and controlling hydraulic oil to another work machine such as a front loader retrofitted to the tractor 1. In the embodiment, four hydraulic operation levers 54 are arranged in accordance with the number of hydraulic external take-out valves 430 (four stations).

  Next, the detailed structure of the cabin 7 will be described with reference to FIGS. The cabin 7 that covers the control seat 8 on the traveling machine body 2 includes a cabin frame 300 that forms a framework. The cabin frame 300 includes a pair of left and right front columns 301 positioned in front of the control seat 8, a pair of left and right rear columns 302 positioned behind the control seat 8, and a front beam that connects between the upper ends of the front columns 301. A member 303, a rear beam member 304 for connecting the upper ends of the rear columns 302, and a left and right side beam member 305 for connecting the upper ends of the front columns 301 and the rear columns 302 arranged in the front-rear direction. It is a box frame. A roof body 306 is detachably attached to the upper end side of the cabin frame 300, that is, on a rectangular frame constituted by the front beam member 303, the rear beam member 304, and the left and right side beam members 305.

  The left and right outer end sides of the front lower plate 307 extending inward and leftward and rightward are connected to the lower end side of each front support column 301. A vertically long board support plate 308 that fixes and supports the dashboard 33 is connected to the left and right inner ends of the left and right front lower plate plates 307, and the board support plate 308 is erected between the left and right front columns 301. On the other hand, a rear intermediate beam member 309 extending in parallel with the rear beam member 304 is connected between the lower ends of the left and right rear columns 302. The rear intermediate beam member 309 is connected to the upper ends of a pair of left and right rear lower frames 310 extending downward. End portions in the longitudinal direction of the bottom frame 311 extending in the front-rear direction are connected to the front lower plate 307 and the lower end side of the rear lower frame 310 aligned in the front-rear direction.

  A rear end upper side of the fender frame 312 that is curved so as to swell forward and upward in a side view along the shape of the rear fender 21 is connected to the lower end side of each rear post 302. The front end lower side of each fender frame 312 is connected to the rear end side of the side frame 313 protruding rearward from the lower portion of the corresponding front support 301. The left and right outer end sides of the front lower plate plate 307 are also connected to each side frame 313. The left and right rear fenders 21 are attached to the left and right outer surfaces of each fender frame 312 and the corresponding left and right outer surfaces of the rear lower frame 310.

A rear cover plate 314 that covers a region surrounded by the rear intermediate beam member 309 and the left and right rear lower frames 310 is attached to the rear intermediate beam member 309 and the left and right rear lower frames 310. A seat support plate 315 that is L-shaped in a side view is attached to the lower end side of the rear cover plate 314 and the left and right bottom frames 311. The control seat 8 is disposed on the seat support plate 315. The left and right fender frames 312, the rear lower frame 310, and the bottom frame 311 are attached with bulged fender inner plates 316 along the front inner surface side of the rear wheel 4. Side columns 42 are disposed on the left and right fender inner plates 316. A floor plate support plate 317 is attached and supported on the left and right front lower plate plates 307, the front side of the bottom frame 311, the side frames 313, and the front end sides of the seat support plates 315. The floor board 40 is disposed on the left and right floor board support plates 317. The front end lower sides of the left and right fender frames 312 and the front and rear middle portions of the bottom frame 311 corresponding thereto are connected by left and right horizontally long auxiliary frames 318.

  A windshield 321 is disposed on the front side of the cabin frame 300, that is, in a region surrounded by the left and right front columns 301, the front beam members 303, and the left and right front lower plate plates 307. A rear glass 322 is disposed on the rear surface side of the cabin frame 300, that is, in a region surrounded by the left and right rear columns 302, the rear beam member 304, and the rear intermediate beam member 309. Side doors 323 made of transparent glass are disposed in the left and right side surfaces of the cabin frame 300, that is, in the region surrounded by the front and rear columns 301 and 302, the side beam members 305, the fender frame 312 and the side frames 313. doing. Each side door 323 is attached to the corresponding rear column 302 via a pair of upper and lower hinges 324 so as to be opened and closed.

  As is apparent from the arrangement structure of the windshield 321, the rear glass 322, and the left and right side doors 323, the columns 301 and 302 and the beam members 303, 304, and 305 are located on the side sides of the cabin 7 (cabin frame 300). ing. For this reason, it is possible to widen the windows on the front, rear, left and right sides of the cabin frame 300. In the embodiment, a windshield 321, a rear glass 322, and left and right side doors 323 (made of transparent glass) are disposed on the front, rear, left and right side surfaces of the cabin frame 300. As a result, both the front / rear and left / right visibility of the operator and the rigidity of the cabin frame 300 are ensured.

  As shown in FIGS. 22 to 25, the front portions of the left and right front lower plate plates 307 are front support bases attached to the left and right body frames 15 via front vibration isolating rubber bodies 98 as vibration isolating members. 96. Further, a base bracket 327 projecting outward in the left and right directions is provided at a connecting portion (butting portion) between the left and right rear lower frames 310 and the bottom frame 311. The left and right base brackets 327 are connected to a rear support 97 attached to the left and right rear axle cases 19 via a rear vibration isolation rubber body 99 as a vibration isolation member. Accordingly, the traveling machine body 2 supports the cabin 7 in a vibration-proof manner via the plurality of vibration-proof rubber bodies 98 and 99.

  As shown in FIGS. 11 to 27, the cabin frame 300 is provided with various support stays 331, 335, 338, and 343 for attaching the lamp member. That is, a pair of left and right front upper support stays 331 are welded and fixed to the middle part of the front beam member 303 in the longitudinal direction. Each of the front upper support stays 331 is a thin plate projecting forward and obliquely upward. A front upper work lamp 333, which is an example of a lamp member, is attached to each front upper support stay 331 via a front attachment piece 332 that extends downward in the forward direction. The left and right front upper stage work lights 333 illuminate the front of the tractor 1. The left and right front upper work lights 333 are positioned so as to overlap the front beam member 303 in front view so as not to obstruct the operator's front view. On the front side of the roof body 306, a recessed portion 334 (also referred to as a bulging portion) that is recessed upward is formed so that each front upper stage work lamp 333 fits. When the roof body 306 is attached to the upper end side of the cabin frame 301, the front upper work light 333 is accommodated in the respective recessed portions 334 on the front side, so that the roof body 306 and each front upper work light 333 do not interfere with each other. .

On the other hand, on the upper end side of the left and right rear struts 302, after projecting rearward outward left and right away from both the rear beam member 304 and the left and right side beam members 305 in a plan view so as not to disturb the operator's front view. The base end side of the upper support stay 335 is fixed by welding. A rear upper work lamp 337, which is an example of a lamp member, is attached to the front end side of each rear upper support stay 335 via a rear attachment piece 336 that extends rearward. The left and right rear upper work lights 337 illuminate the rear of the tractor 1 (work machine, etc.). In the embodiment, by providing the rear upper stage support stay 335 on the upper end side of each rear column 302 instead of the rear beam member 304, while ensuring a good rear view of the operator, between the left and right rear upper stage support stays 335, An arrangement space on the rear side of the roof body 306 (an arrangement space for the rear cover 363 that accommodates the air conditioner 364) is secured.

  The proximal end side of the front middle support stay 338 is fixed by welding to the middle part of the front and rear left and right support posts 301. A front composite lamp 339 and a front / middle work lamp 340, which are examples of lamp members, are attached to the front end side of each front / middle support stay 338. Each front middle support stay 338 is laterally outward facing away from both the front beam member 303 and the left and right side beam members 305 in plan view so that the front composite light 339 and the front middle work light 340 do not obstruct the front view of the operator. Projecting forward and curved so as to extend forward from the midway part in the longitudinal direction. The front composite light 339 indicates the intention of the vehicle and the person in front of the tractor 1 such as the vehicle width and left-right rotation of the tractor 1, and the front composite light 339 according to the embodiment includes a direction indicator light and a vehicle width. It consists of lights. The left and right front middle stage work lights 340 illuminate the front of the tractor 1. In the embodiment, a vertical mounting bracket 341 is provided on the front end side of each front middle support stay 338, and a front composite lamp 339 is attached to the front side of the mounting bracket 341. A front middle work lamp 340 is attached to the upper end side of the attachment bracket 341. Note that side mirrors 342 are attached via mirror stays 341 above the front and middle support stays in the left and right front columns 301. The mirror stay 341 also extends forward in the left and right directions away from both the front beam member 303 and the left and right side beam members 305 in a plan view so as not to disturb the operator's front view.

  The front side of the rear lower support stay 343 in the vertical direction is welded and fixed to the lower portions of the left and right rear struts 302. A rear composite lamp 344 and a rear lower stage work lamp 345, which are examples of lamp members, are attached to the rear side of each rear lower stage support stay 343. Each rear lower support stay 343 projects outward from the left and right rear struts 302 in the rear view so that the rear composite lamp 344 and the rear lower work lamp 345 do not obstruct the operator's rear view. The rear composite light 344 indicates the intention of the vehicle or person behind the tractor 1 to decelerate, stop, reverse, rotate left and right, and the like. It consists of a light, a reverse light, and a direction indicator light. The left and right rear lower work lamps 345 illuminate the left and right sides of the tractor 1. In the embodiment, the rear composite lamp 344 is attached to the front side of each rear lower support stay 343. A rear lower work lamp 345 is attached to the upper end side of the rear lower support stay 343. The front composite lamp 339 and the rear composite lamp are set at approximately the same vertical height.

  Although not shown in detail, in the embodiment, the cabin frame 300 is formed in a hollow shape, and the inside of the hollow shape is configured as a wiring passage for inserting cables. Then, cables are pulled out from the notches (not shown) formed in the support columns 301, 302, the beam members 303, 304 and the support stay, and the cables are connected to the lamp members 333, 337, 339, 340, 344, 345. doing.

  As apparent from the above description and FIGS. 11 to 27, the cabin 7 is provided that covers the control seat 8 on the traveling machine body 2, and the cabin 7 includes a cabin frame 300 that constitutes a framework, and the cabin frame 300. In the work vehicle 1 having the roof body 306 arranged on the upper end side, support stays 331, 335, 338, 343 for attaching the lamp members 333, 337, 339, 340, 344, 345 are provided in the cabin frame 300. The lamp members 333, 337, 339, 340, 344, and 345 can be directly attached to the cabin frame 300. For this reason, it contributes to the assembly workability | operativity improvement in a production line, and can aim at cost reduction.

  The cabin frame 300 includes a pair of left and right front struts 301, a pair of left and right rear struts 302, a front beam member 303 connecting between the upper ends of the front struts 301, and an upper end of the rear struts 302. A rear beam member 304 that connects the front beam 301 and a side beam member 305 that connects the upper ends of the front column 301 and the rear column 302 that are arranged in the front-rear direction. A front composite lamp 339 and a front middle work lamp 340 as the lamp members are attached to the support stay 338, and a rear composite lamp 344 as the lamp member and the support stay 343 provided at the lower part of each rear column 302 Since the rear lower stage work lamp 345 is attached, the front composite lamp 339 and the front middle stage work lamp 340 can be attached together on the support stay 338 on the front post 301 side. The support stay 343 posts 302 side, be mounted together rear composite lamp 344 and rear lower working light 345. That is, the support stays 338 and 343 can be used as support members for the plurality of lamp members 339, 340, 344, and 345, thereby contributing to a reduction in the number of parts. In addition, the handling of cables for the plurality of lamp members 339, 340, 344, and 345 can be simplified. It is easy to secure the front / rear and left / right visibility from within the cabin 7.

  As apparent from the above description and FIGS. 11 to 27, the cabin 7 is provided that covers the control seat 8 on the traveling machine body 2, and the cabin 7 includes a cabin frame 300 that constitutes a framework, and the cabin frame 300. In the work vehicle 1 having the roof body 306 disposed on the upper end side, the cabin frame 300 connects the pair of left and right front columns 301, the pair of left and right rear columns 302, and the upper ends of the front columns 301 to each other. A front beam member 303; a rear beam member 304 that connects the upper ends of the rear columns 302; and a side beam member 305 that connects the upper columns of the front column 301 and the rear column 302 arranged in the front-rear direction. A front upper work lamp 333 is attached to each of a pair of left and right support stays 331 provided in the middle of the longitudinal direction of the front beam member 303, Since the rear upper work lamp 337 is attached to the support stay 335 provided on the side, the front upper work lamp 333 can be directly attached to the front beam member 303, and the rear upper work lamp 337 is attached to the rear beam member 304. Can be attached directly. For this reason, it contributes to the assembly workability | operativity improvement in a production line, and can aim at cost reduction. In addition, since it is not necessary to attach the upper work lights 333 and 337 to the roof body 306 or route cables, the assembling work of the roof body 306 with respect to the cabin frame 300 can be simplified. This also contributes to improving the assembly workability on the production line.

  In addition, since each front upper work lamp 333 is positioned so as to overlap the front beam member 303 in a front view, each front upper work lamp 333 may block the front view of the operator seated on the control seat 8. Can be significantly reduced, and the operator's front view can be secured well.

  Next, the detailed structure of the step 10 provided in the left and right lower portions of the cabin 7 will be described with reference to FIGS. As shown in FIGS. 11 to 23, a step 10 on which an operator gets on and off is provided on the left and right lower sides of the cabin 7 between a front wheel 3 and a rear wheel 4 arranged in front and rear. Step 10 of the embodiment includes a plurality of tread plate step portions 351 (two steps in the embodiment), and front and rear side plate portions 352 and 353 connected to these tread plate step portions 351. The plurality of tread plate step portions 351 are shifted from each other in the front-rear direction so as to move away from the rear wheel 4 as going downward. In the embodiment, the lower step tread step 351 is displaced forward from the upper step tread step 351.

In this case, the front side plate part 352 is formed in a substantially L shape in front view. The upper end side of the vertically long portion 354 in the front plate portion 352 is bolted to a bracket piece 355 that is welded and fixed to the lower end side of each front column 301. The front end side of the upper stepped plate step portion 351 is fixed to a vertically halfway portion of the vertically long portion 354 in the front side plate portion 352. The front end side of the lower tread plate step portion 351 is fixed to the lower end horizontal portion 356 of the front plate portion 352. The lower end horizontal part 356 of the front side plate part 352 projects forward from the vertically long part.

  The upper end side of the rear plate portion 353 is bolted to an auxiliary frame 318 that connects the left and right fender frames 312 and the bottom frame 311. The rear end side of the upper step plate step portion 351 is fixed to the upper and lower middle portions of the rear plate portion 353. The rear end side of the lower tread plate step portion 351 is fixed to the lower end side of the rear plate portion 353. The rear side plate portion 353 is inclined forward and downward and is further bent forward in the vicinity of the upper and lower middle portions. If comprised in this way, it will become easy to orient | assign the moving direction of the operator who gets into the cabin 7 in the back diagonally upward toward the control seat 8 (the operator's flow line may be directed to the control seat 8 by the shifting arrangement | positioning of each stepping plate step part 351. Possible). Therefore, the boarding / alighting property to the cabin 7 can be remarkably improved.

  As shown in FIGS. 13, 19, 22, and 23, the lateral width of the rear side plate portion 353 is set wider than the lateral width of the front side plate portion 352 (vertically long portion 354). If comprised in this way, when an operator puts a foot on each step board step part 351, presence of the front side board part 352 (vertically long part 354) does not become obstructive, and it contributes to the boarding / alighting improvement of the cabin 7 also in this point. Moreover, since the rear side plate part 353 is wide, mud splashing of the rear wheel 4 can be effectively suppressed by the presence of the rear side plate part 353.

  As apparent from the above description and FIGS. 11 to 23, the traveling machine body 2 on which the engine 5 is mounted, the pair of left and right front wheels 3 and rear wheels 4 that support the traveling machine body 2, and the traveling machine body 2 In a work vehicle 1 that includes a cabin 7 that covers a certain control seat 8 and a step 10 for getting in and out of the cabin 7, the left and right sides of the cabin 7 are positioned between the front wheel 3 and the rear wheel 4 that are lined up and down. On the lower side, the step 10 is suspended and provided, and the step 10 includes a plurality of step plate step portions 351 and front and rear side plate portions 352 and 353 connected to the step plate step portions 351. The plurality of tread stepped portions 351 are shifted from each other in the front-rear direction so as to move away from the rear wheel 4 toward the lower step, so that the operator moves along the flow line of the operator toward the inside and outside of the cabin 7. Will be located the treadle stepped portion 351, it can be significantly improved passenger of the said cabin 7.

  Further, since the width in the left-right direction of the rear side plate portion 353 is set wider than the width in the left-right direction of the front side plate portion 352 (vertically long portion 354), when the operator puts his / her foot on each step plate step portion 351 Further, the presence of the front side plate portion 352 does not get in the way, and this also contributes to an improvement in getting on and off the cabin 7. Moreover, since the said rear side board part 353 is wide, mud splash of the said rear wheel 4 can be suppressed effectively by the presence of the said rear side board part 353.

  Next, the air conditioning structure inside and outside the roof body 306 will be described with reference to FIGS. 1, 2, 11, 14, 28, and 29. The roof body 306 attached to the upper end side of the cabin frame 301 includes an outer roof 361 that is an exterior, an inner roof 362 that forms the ceiling of the cabin 7, and a rear cover 363 that protrudes rearward from the rear beam member 304. Yes. By covering the inner roof 362 and the rear cover 363 with the outer roof 361 from above, the inside of the roof body 306 is configured to be hollow. Therefore, the rear side of the outer roof 361 also extends rearward from the rear beam member 304. A recess 334 (bulging portion) into which each front upper work lamp 333 is fitted is formed on the front side of the outer roof 361.

The interior of the roof body 306 is divided into two front and rear chambers by an inner roof 362 and a rear cover 363. The space on the inner roof 362 side corresponds to the front chamber, and the space on the rear cover 363 side corresponds to the rear chamber. An air conditioner 364 that manages the air conditioning in the cabin 7 is accommodated in the rear chamber side (rear cover 363 side) inside the roof body 306. The air conditioner 364 adjusts the air conditioning (room temperature) in the cabin 7 by heating using the cooling water of the engine 5 and cooling using a compressor, a condenser, an evaporator, and the like driven by the engine. By disposing the air conditioner 364 on the rear cover 363 side protruding rearward from the rear beam member 304, the overall height of the cabin 7 is prevented from becoming higher than necessary. In particular, in the embodiment, by providing the rear upper stage support stay 335 on the upper end side of each rear column 302 instead of the rear beam member 304, while ensuring a good rear view of the operator, between the left and right rear upper stage support stays 335. In addition, an arrangement space on the rear side of the roof body 306 (an arrangement space for the rear cover 363 that houses the air conditioner 364) is secured.

  The rear cover 363 is connected to the rear beam member 304 of the cabin frame 300. Therefore, the rear cover 363 and the air conditioner 364 are supported by the rear beam member 304 of the cabin frame 300. A sealing material 365 is attached to the peripheral edge of the rear cover 363. In a state where the outer roof 361 is placed on the inner roof 362 and the rear cover 363, the sealing material 365 is in close contact with the inner surface side of the outer roof 361, and the rear chamber side (rear cover 363 side) inside the roof body 306 is hermetically sealed. It becomes a shape.

  The left and right side portions of the outer roof 361 are inclined so as to be cut obliquely downward toward the left and right inner sides. Of the left and right sides of the outer roof 361, the side opposite to the tail pipe 229 (see FIGS. 1 to 10) that discharges the exhaust gas of the engine 5 to the outside is the rear chamber side (rear cover) inside the roof body 306. 363 side) is connected to the outside, and an outside air intake port 366 is formed. In this case, the tail pipe 229 is erected so as to extend from the lower side to the upper side on the right front side of the cabin 7 (extends along the right front column 301). On the other hand, the outside air intake port 366 is formed on the rear side of the left side portion of the outer roof 361 (the portion corresponding to the rear cover 363). The outside air intake port 366 faces the air conditioner 364 in the rear cover 363 from the left side through a communication port (not shown) formed in the left wall portion of the rear cover 363. A lattice-shaped ventilation frame body 367 is attached to the outside air intake port 366. Although not shown in detail, a dust filter is attached to the communication port formed in the left side wall of the rear cover 363. On the other hand, on the rear side of the inner roof 362 facing the back of the operator seated on the control seat 8, an inside air intake port 368 that connects the inside of the rear cover 363 and the cabin 7 is formed. A lattice-shaped ventilation frame body 369 is attached to the inside air intake port 368.

  Inside the rear cover 363, an inside / outside air switching shutter plate 370 for opening and closing a communication port formed in the left side wall portion of the rear cover 363 is disposed. The inside / outside air switching shutter plate 370 is configured to be opened and closed by driving an actuator 371. When the inside / outside air switching shutter plate 370 is moved to open, the communication port of the rear cover 363 is opened, and the air conditioner 364 in the rear cover 363 is driven to communicate with the outside through the communication port from the outside air intake port 366 into the rear cover 363. Air is guided. When the inside / outside air switching shutter plate 370 is closed, the communication port of the rear cover 363 is closed and external air does not enter from the outside air inlet 366, and the air conditioner 364 is driven to drive the inside of the rear cover 363 from the inside air inlet 368. The air in the cabin 7 is guided to the inside. In the embodiment, the ratio of the outside air and the inside air guided to the air conditioner 364 in the rear cover 363 can be adjusted by the opening degree (opening / closing degree) of the inside / outside air switching shutter plate 370.

The adjustment air discharge port 372 formed on the front surface side of the air conditioner 364 has a bifurcated air conditioning duct in plan view that guides the adjustment air from the rear chamber side (rear cover 363 side) to the front chamber side (inner roof 362 side). The upstream side of 373 is connected. The upstream side of the air conditioning duct 373 is located above the inside air intake port 368 and passes through the front surface side of the rear cover 363 and the rear surface side of the inner roof 362 and branches into a bifurcated right and left. The bifurcated duct portion 374 of the air conditioning duct 373 extends in a rectangular shape in plan view along a rectangular frame formed by the front beam member 303, the rear beam member 304, and the left and right side beam members 305. An adjustment shutter plate 376 that adjusts the communication state between the air conditioning duct 375 provided on the left and right sides of the inner roof 362 and the duct portion 374 is disposed in the middle of each duct portion 374 of the air conditioning duct 373. The left and right adjustment shutter plates 376 are configured to rotate in conjunction with each other by an actuator 377 and a push-pull wire 378. The downstream side of each duct portion 374 of the air conditioning duct 373 communicates with a defrosting outlet 379 provided at the front portion of the inner roof 362. Each of the outlets 375 and 379 is provided with fins (not shown) for changing and adjusting the amount and direction of the adjusted air from the air conditioner 364.

  When the left and right adjustment shutter plates 376 block the downstream flow of each duct portion 374 (flow to each defrosting outlet 379), the adjusted air from the air conditioner 364 is supplied to the right and left air conditioning outlets. It blows out into the cabin 7 only from 375. When the flow to the left and right air conditioning outlets 375 is blocked by the left and right adjusting shutter plates 376, the adjusted air from the air conditioner 364 is blown into the cabin 7 only from the left and right defrosting outlets 379. According to the rotation angle of both the left and right adjustment shutter plates 376, the air volume of the adjustment air from the air conditioning outlet 375 and the air volume of the adjustment air from the fog removal outlet 379 can be adjusted.

  As shown in FIGS. 28 and 48, a sound absorbing material 444 is disposed on the upper surface side of the inner roof 362 constituting the ceiling of the front chamber of the roof body 306. A sound absorbing material 444 is accommodated in the inner roof 362. The sound absorbing material 444 of the embodiment is made of, for example, foamed urethane, soft urethane, gypsum board, glass wool, or the like. In this case, a ceiling hole 445 is formed in the inner roof 362. A closing plate 446 that closes the ceiling hole 445 is detachably attached to a location of the ceiling hole 445 of the inner roof 362. A sound absorbing material 444 is attached to the upper surface side of the closing plate 446 with an adhesive or the like. By attaching the closing plate 446 to the inner roof 362 so as to cover the ceiling hole 445, the sound absorbing material 444 is accommodated in the inner roof 362 (between the outer roof 361 and the inner roof 362).

  As is clear from the above description and FIGS. 1, 2, 11, 14, 28 and 29, the cabin 7 covers the control seat 8 on the traveling body 2, and the cabin 7 has a framework. In a work vehicle 1 having a cabin frame 300 and a roof body 306 disposed on the upper end side of the cabin frame 300, a tail pipe 135 for releasing exhaust gas of the engine 5 mounted on the traveling machine body 2 to the outside is provided. The roof body 306 is provided on one of the left and right sides of the traveling machine body 2, and the interior of the roof body 306 is divided into two front and rear chambers. Since the outside air intake port 366 for communicating the rear chamber 363 with the outside is formed on the opposite side to the outside, the exhaust gas from the tail pipe 229 is supplied to the outside air intake port 366. The risk of capture can be significantly prevented.

  The cabin frame 300 includes a pair of left and right front struts 301, a pair of left and right rear struts 302, a front beam member 303 connecting between the upper ends of the front struts 301, and an upper end of the rear struts 302. A rear beam member 304 that connects the front beam 301 and a side beam member 305 that connects the upper ends of the front column 301 and the rear column 302 arranged in the front-rear direction, and the rear chamber 363 of the roof body 306 is connected to the rear beam. Since the rear chamber 363 is supported by the rear beam member 304, and the rear upper work lamp 337 is attached to the support stay 335 provided on the upper end side of each rear column 302, The air conditioner 364 can be disposed inside the roof body 306 without increasing the overall height of the cabin 7, and the air conditioner 364 is accommodated in the front chamber 362 of the roof body 306. You can avoid the problem of limiting the forward view of the Operator. Further, by attaching the rear upper work lamp 337 to the support stay 335 provided on the upper end side of each rear column 302, the arrangement space on the rear chamber 363 side of the roof body 306 is reduced for the rear upper work lamps 337. While being able to form between the support stays 335, the operator's back view can also be ensured favorable. Further, since the rear chamber 363 that houses the air conditioner 364 is partitioned from the front chamber 362, it is easy to improve the sealing performance of the rear chamber 363. This also contributes to an improvement in workability of the air conditioner 364.

  As apparent from the above description and FIGS. 28 and 48, the cabin frame 300 constituting the framework of the cabin 7 that covers the control seat 8 on the traveling body 2 and the roof body 306 disposed on the upper end side of the cabin frame 300. The roof body 306 is divided into two front and rear chambers, and a sound absorbing material 444 is disposed on the upper surface side of the inner roof 362 constituting the ceiling of the front chamber of the roof body 306. Since the sound absorbing material 444 is accommodated in the room, noise near the upper side in the cabin 7 can be efficiently absorbed by the sound absorbing material 444.

  In addition, since a closing plate 446 for closing the ceiling hole 445 formed in the inner roof 362 is provided, and the sound absorbing material 444 is attached to the upper surface side of the closing plate 446, the closing plate 446 is attached to the inner roof 362. The sound absorbing material 444 can be easily attached to or detached from the roof body 306 simply by attaching and detaching.

  Next, the detailed structure of the beam members 303, 304, and 305 will be described with reference to FIGS. 30 (a) to 30 (d), FIG. 31, and FIG. As described above, the rectangular frame that supports the roof body 306 includes the front beam member 303, the rear beam member 304, and the left and right side beam members 305. The front beam member 303, the rear beam member 304, and the left and right side beam members 305 correspond to frame members constituting the cabin frame 300. As shown in FIG. 30A, the front beam member 303 is made of a hollow (rectangular cross-section) square pipe material, and extends long in the left-right direction. As shown in FIGS. 31 (a) and 31 (b), the left and right end surfaces of the front beam member 303 are welded and fixed to the upper end side surface of the front column 301.

  The rear beam member 304 and the left and right side beam members 305 are both made of steel having a C-shaped cross section (groove shape). The rear beam member 304 extends long in the left-right direction, and the left and right side beam members 305 extend long in the front-rear direction. Reinforcing plates 304a and 305a extending along the respective longitudinal directions are fitted into the openings of the rear beam member 304 and the side beam members 305 and fixed by welding. For this reason, at least the longitudinal halfway part of the rear beam member 304 and each side beam member 305 is hollow (such as a rectangular pipe).

  As shown in FIGS. 32 (a) and 32 (b), the left and right end surfaces of the rear beam member 304 are welded and fixed to the upper end side surface of the rear column 302. As shown in FIGS. 31A and 31B, the front end surface of each side beam member 305 is welded and fixed to the upper end side surface of the front column 301. Therefore, either the left or right end surface of the front beam member 303 and the front end surface of either of the left or right side beam members 305 are in contact with the upper end side of the front column 301. A bracing reinforcement bracket 319 is fixed by welding inside the front beam member 303 and the left and right side beam members 305. The presence of the reinforcing bracket 319 ensures the connection strength between the front beam member 303, the left and right side beam members 305, and the front column 301.

  As shown in FIGS. 32A and 32B, the rear end surface of each side beam member 305 is fixed to the upper end side surface of the rear column 302 by welding. Therefore, either the left or right end face of the rear beam member 304 and the rear end face of either the left or right side beam member 305 are in contact with the upper end side of the rear column 302. A brace-like reinforcing bracket 319 is also welded and fixed inside the rear beam member 304 and the left and right side beam members 305. The presence of the reinforcing bracket 319 ensures the connection strength between the rear beam member 304, the left and right side beam members 305, and the rear column 302.

As is clear from the above description and FIGS. 30 to 32, the work vehicle 1 includes a cabin 7 that covers the control seat 8 on the traveling machine body 2, and the cabin 7 includes a cabin frame 300 that forms a skeleton. At least one frame member 304, 305 of the cabin frame 300 is formed in a C-shaped cross section, and reinforcing plates 304a, 305a extending along the longitudinal direction of the frame member 304, 305 are provided on the frame member 304, 305. By welding and fixing to the opening, at least the longitudinal middle part of the frame member 304, 305 is formed in a hollow shape, so that the frame member 304, As a result, the rigidity of the cabin frame 300 can be improved and the cost can be reduced.

  Next, details of the anti-vibration support structure on the lower rear side of the cabin 7 will be described with reference to FIGS. 22 to 25 and FIGS. 33 (a) and 33 (b). Base brackets 327 are attached to the left and right abutting portions on the lower rear side of the cabin frame 300 so as to project outward in the left and right directions. In this case, as shown in FIGS. 22 to 25 and FIGS. 33 (a) and 33 (b), a base bracket projecting outward in the left and right directions at a connecting portion (butting portion) between the left and right rear lower frames 310 and the bottom frame 311. 327 is provided. A base bracket 327 is connected to a rear support base 97 on the rear axle case 19 that protrudes left and right outward from the transmission case 17 of the traveling machine body 2 via a rear vibration isolation rubber body 99 that is a vibration isolation member. . In the embodiment, the lower end surface of the rear lower frame 310 is fixed to the upper surface of the rear end of the bottom frame 311 by welding. A base bracket 327 is previously attached to the rear end side of the bottom frame 311 by welding to form a unit.

  The base bracket 327 includes a substrate plate 328 to which the rear anti-vibration rubber body 99 is attached, and a pair of front and rear connecting pieces 329 and a reinforcing plate piece 330 that complement the connection strength between the substrate plate 328 and the bottom frame 311. The substrate plate 328 is fixed by welding so as to protrude outward in the left-right direction with respect to the lower surface of the rear end of the bottom frame 311. The pair of front and rear connecting pieces 329 connects the upper surface of the substrate plate 328 and the rear end side of the bottom frame 311. The rear cover piece 329 closes the rear opening end surface of the bottom frame 311 which is a hollow (a rectangular cross section) square pipe material. The front cover piece 329 supports the rear end side surface of the bottom frame 311 via the reinforcing plate piece 330. The reinforcing plate piece 330 is disposed so as to overlap the butted portion of the rear lower frame 310 and the bottom frame 311 from the side. An opening hole 330 a is formed in the reinforcing plate piece 330 so as to face the butted portion between the rear lower frame 310 and the bottom frame 311. The presence of the opening hole 330a makes it possible to weld the reinforcing plate piece 330 to the portion of the butted portion of the rear lower frame 310 and the bottom frame 311 that the reinforcing plate piece 330 covers.

  According to the above configuration, the base bracket 327 with the reinforcing plate piece 330 is attached in advance to the bottom frame 311 to be unitized, and the rear lower frame 310 can be retrofitted and fixed to the bottom frame 311. In addition, when the rear lower frame 310 is fixed to the bottom frame 311 by welding, the welding length of the portion of the butted portion between the bottom frame 311 and the rear lower frame 310 that covers the reinforcing plate piece 330 is sufficiently increased due to the presence of the opening hole 330a. It can be secured. Therefore, while the joining workability of the bottom frame 311 and the rear lower frame 310 can be improved, the joining strength of the bottom frame 311 and the rear lower frame 310 can be improved, and the rigidity of the cabin frame 300 can be improved.

  Further, a base bracket 327 is attached to the left and right abutting portions on the lower rear side of the cabin frame 300 so as to protrude outward in the left and right directions, and the rear axle case 19 that protrudes outward in the left and right directions from the transmission case 17 of the traveling body 2 Since the base bracket 327 is connected to the support base 97 via the vibration isolation member 99, the lower rear side of the cabin frame 300 can be supported from the left and right outer sides, and the lower rear side of the cabin frame 300 is supported by the traveling aircraft body. 2 can be connected in a vibration-proof and stable manner.

Next, the details of the vibration isolating support structure on the lower rear side of the cabin 7 will be described with reference to FIGS. 34 and 35. As described above, on the left and right sides of the cabin 7 (the left and right side surfaces of the cabin frame 300), the transparent single glass side doors 323 are disposed so as to be able to be opened and closed. The side door 323 is attached to the corresponding rear column 302 through a pair of upper and lower hinges 324 so as to be opened and closed. On the front side of the side door 323, the side door 323
A door lock member 400 is provided for switching between a locked state and an unlocked state. By operating the handle 400a provided on the outer surface side of the door lock member 400, the door lock member 400 is locked or unlocked, and the side door 323 is opened and closed. On the inner surface side of the side door 323, a C-shaped reinforcing frame 401 in side view is arranged to increase the strength of the side door 323.

  The reinforcing frame 401 includes a vertical frame portion 402 extending along the rear edge side of the side door 323, an upper horizontal frame portion 403 extending forward from the upper end side of the vertical frame portion 402 along the upper edge side of the side door 323, and a vertical frame. A lower horizontal frame portion 404 extending forward from the lower end side of the portion 402 so as to partition the upper and lower sides of the side door 323. The lower horizontal frame portion 404 is located in the middle of the upper and lower sides of the inner surface of the side door 323 and corresponds to a longitudinal frame body that increases the strength of the side door 323. In the embodiment, the reinforcing frame 401 is positioned so as to surround the upper side of the side door 323.

  The reinforcing frame 401 is connected to the door lock member 400 and a pair of upper and lower hinges 324. In the embodiment, the front end side of the lower horizontal frame portion 404 is connected to the door lock member 400. A corner portion between the lower horizontal frame portion 404 and the vertical frame portion 402 is connected to the front end side of the lower hinge 324, and an upper end side of the vertical frame portion 402 is connected to the upper hinge 324. That is, the side door 323 is sandwiched between the door lock member 400 and the pair of upper and lower hinges 324 and the reinforcing frame 401. A front end side of the upper horizontal frame portion 403 is directly connected to an upper end front portion of the side door 323. The lower hinge 324 and the fender frame 312 are connected via an air cylinder 405.

  The door lock member 400 is switched to the unlocking direction by grasping with a hand at the middle part of the lower horizontal frame part 404, that is, the part of the lower horizontal frame part 404 where the hand of the operator seated on the control seat 8 reaches. A grip body 406 to be operated is provided. Although not shown in detail, the grip body 406 is interlocked and connected to the door lock member 400 via a wire member built in the lower horizontal frame portion 404. For example, if the grip body 406 is grasped together with the lower horizontal frame portion 404, the door lock member 400 is switched in the unlocking direction via the wire member. As a result, the door lock member 400 is unlocked. The operator can unlock the door lock member 400 only by a very simple operation of holding the grip body 406 together with the lower horizontal frame portion 404 while sitting on the control seat 8. If the side door 323 is pushed as it is, the side door 323 smoothly opens and rotates.

  As is clear from the above description and FIGS. 34 and 35, the cabin 7 that covers the control seat 8 on the traveling machine body 2 is provided, and the cabin 7 includes a cabin frame 300 that forms a framework, and left and right sides of the cabin 7. In the work vehicle 1 having the side door 323 that can be opened and closed, a C-shaped reinforcing frame 401 in a side view that increases the strength of the side door 323 is disposed on the inner surface side of the side door 323, and the reinforcing frame 401, a vertical frame portion 402 extending along the rear edge side of the side door 323, an upper horizontal frame portion 403 extending forward from the upper end side of the vertical frame portion 402 along the upper edge side of the side door 323, A lower horizontal frame portion 404 extending forward from the lower end side of the vertical frame portion 402 so as to partition the upper and lower sides of the side door 323. Because it has to, the reinforcing frame 401 so as to surround the upper portion of the side door 323 will be located. For this reason, the rigidity of the side door 323, which is often made of a single glass, is utilized by using the reinforcing frame 401 as a strength member of the side door 323 itself, while ensuring the side view of the cabin 7 side. Can be planned. Further, the lower horizontal frame portion 404 can be used as a handrail for getting on and off the cabin 7.

The reinforcing frame 401 is connected to a door lock member 400 that switches the side door 323 between a locked state and an unlocked state, and a pair of upper and lower hinges 324 that connect the side door 323 to the cabin frame 300 so as to be opened and closed. Since they are connected, the side door 323 can be sandwiched between the door lock member 400 and the pair of upper and lower hinges 324 and the reinforcing frame 401, and the reinforcing frame 401 can be easily and highly strengthened with respect to the side door 323. Can be linked. Therefore, the assembly work of the side door 323 can be facilitated and the manufacturing cost can be reduced.

  As is clear from the above description and FIGS. 34 and 35, the cabin 7 that covers the control seat 8 on the traveling machine body 2 is provided, and the cabin 7 includes a cabin frame 300 that forms a framework, and left and right sides of the cabin 7. In a work vehicle having a side door 323 that can be opened and closed, a door lock member 400 that switches the side door 323 between a locked state and an unlocked state is provided on the front side of the side door 323, and the side door A front and rear longitudinal frame body 404 that increases the strength of the side door 323 is disposed in the middle of the upper and lower sides of the inner surface of the H.323, and the door lock member 400 is connected to the front end side of the frame body 404. The door lock member 400 can be locked by grasping the operator's hand seated on the control seat 8 with a hand. Since the grip body 406 for switching operation in the release direction is provided, the operator can hold the door lock member only by a very simple operation such as gripping the grip body 406 together with the frame body 404 while sitting on the control seat 8. 400 can be unlocked, and the opening operability of the side door 323 can be improved.

  Next, the detailed structure of the hinge 324 that rotatably supports the side door 323 will be described with reference to FIGS. 36 and 37. The upper and lower hinges 324 for connecting the side door 323 to the rear column 302 of the cabin frame 300 so as to be openable and closable are a hinge stay 408 provided on the rear column 302 and a hinge cover 409 pivotally attached to the hinge stay 408 so as to be laterally rotatable. And have. The front half of the hinge cover 409 is bolted to the rear edge side of the side door 323. The hinge stay 408 includes a flat plate portion 408a protruding from the rear column 302 and a pivotal support portion 408b formed on the tip side of the flat plate portion 408a. A stopper bolt 410 is attached to the flat plate portion 408 a of the hinge stay 408 as a stopper member that abuts on the inner surface rear side of the hinge cover 409 and restricts the maximum opening angle of the side door 323. The stopper bolt 410 is provided with a metal contact plate 411 on the inner surface rear side of the hinge cover 409. A state in which the side door 323 is opened and the head or the tip of the stopper bolt 410 is brought into contact with the contact plate 411 of the hinge cover 409 is the maximum opening angle of the side door 323. By adjusting the screwing amount of the stopper bolt 410, the contact position between the contact plate 411 of the hinge cover 490 and the stopper bolt 410 is changed, and the maximum opening angle of the side door 323 is adjusted.

  As apparent from the above description and FIGS. 36 and 37, the cabin 7 is provided that covers the control seat 8 on the traveling machine body 2, and the cabin 7 includes a cabin frame 300 that forms a framework, and left and right sides of the cabin 7. In the work vehicle 1 having a side door 323 that can be opened and closed, the work vehicle 1 includes a hinge 324 that connects the side door 323 to the cabin frame 300 so as to be opened and closed. The hinge 324 is provided in the cabin frame 300. The hinge stay 408 and a hinge cover 409 pivotally attached to the hinge stay 408 so that the hinge stay 408 is in contact with the inner surface of the hinge cover 409 and has a maximum opening angle of the side door 323. Since the stopper member 410 that restricts movement is attached, the hinge stay 408 is attached to the hinge stay 408. Only simple structure using the stopper member 410 attached, can achieve regulation of the maximum opening angle of the side door 323. Therefore, a structure that regulates the maximum opening angle of the side door 323 can be manufactured at low cost, and the cost can be reduced.

The stopper member 410 is a stopper bolt that is screwed into the hinge stay 408. By adjusting the screwing amount of the stopper bolt 410, the position of contact with the hinge cover 409 is changed and the side door 323 is fully opened. Since the angle is adjusted, the adjustment operation of the maximum opening angle of the side door 323 can be performed extremely easily.

  Next, a structure for switching the opening / closing position of the rear glass 322 as an opening / closing window in a plurality of stages will be described with reference to FIGS. 38 to 41. On the rear side of the cabin 7 (the rear surface side of the cabin frame 300), a transparent single glass rear glass 322 that closes and opens the portion is disposed. The rear glass 322 is attached to the rear beam member 304 through a pair of left and right hinges 413 so as to be openable and closable (can be turned up and down). A locked block 414 serving as a locked portion that determines the opening / closing position of the rear glass 322 is bolted to the left and right central portions of the upper surface of the rear intermediate beam member 309 in the cabin frame 300. The locked block 414 is formed in a U-shape in plan view that opens toward one of the rear columns 302.

  A rotating handle 415 is attached to the free end side of the inner surface of the rear glass 322. The rotary handle 415 includes a handle base portion 416 fastened to the free end of the inner surface of the rear glass 322, a rotary shaft portion 417 protruding forward from the handle base portion 416, and a handle protruding in a direction intersecting with the rotary shaft portion 417. Part 418. The rotating shaft portion 417 is formed with a plurality of downwardly protruding engaging protrusions 420a and 420b that are positioned at an appropriate interval in the longitudinal direction. There are two engagement protrusions 420a and 420b in the embodiment, and the opening / closing position of the rear glass 322 can be switched in four stages including the fully closed position by the combination of the engagement protrusions 420a and the locked block 414. It is configured.

  That is, in the state where the first engaging protrusion 420a on the rear end side of the rotation shaft portion 417 is brought into contact with the front side surface 414a on the inner side of the cabin 7 of the locked block 414, the rear side portion of the cabin 7 Is closed by the rear glass 322 (the rear glass 322 is in the fully closed position). In a state where the first engagement protrusion 420 a is fitted in the U-shaped recessed groove 414 b of the locked block 414, the rear glass 322 is in a minimum half-open position slightly separated from the rear side portion of the cabin 7. In a state in which the second engagement protrusion 420b on the front end side of the rotation shaft portion 417 is in contact with the front side surface 414a of the locked block 414 so as to overlap, the rear side portion of the cabin 7 is located behind the cabin 7 from the minimum half-open position. An intermediate half-open position away from In a state in which the second engagement protrusion 420b is fitted into the recessed groove 414b of the locked block 414, the rear glass 322 is at the maximum open position farthest from the rear side portion of the cabin 7. The opening / closing window is not limited to the rear glass 322. Further, the opening / closing window is not limited to the flip-up type, and may be a vertical type or a horizontal type.

  A wiper 421 for cleaning the rear glass 322 is provided on the outer surface upper side of the rear glass 322 (see FIG. 38). On the other hand, a wiper drive case 422 that houses a wiper motor (not shown) for driving the wiper 421 and the like is mounted on the inner surface upper side of the rear glass 322 (see FIG. 39). Since the wiper 421 protrudes outward at the upper part of the outer surface of the rear glass 322, the wiper 421 interferes with the rear cover when the rear glass 322 is swung up and rotated on the rear cover 363 of the roof body 306. A relief recess 423 that is recessed upward is prevented (see FIG. 29). As shown in FIG. 38, a reflector 427 is provided on the fixed bracket 424 attached to the left side of the rear glass 322. The fixed bracket 424 and the left rear column 302 are connected via a damper body 425 such as an air cylinder, and the right side portion of the rear glass 322 and the right rear column 302 are connected via a damper body 426 such as an air cylinder. (See FIG. 39).

As is clear from the above description and FIGS. 38 to 41, the cabin 7 is provided that covers the control seat 8 on the traveling machine body 2, and the cabin 7 includes a cabin frame 300 that forms a skeleton, and one side portion of the cabin 7. In the work vehicle 1 having a pivotable opening / closing window 322 that can be opened and closed, a locking portion 414 that determines the opening / closing position of the opening / closing window 322 is attached to the cabin frame 300. A plurality of engaging protrusions 420a and 420b that are selectively engaged with and disengaged from the locked portion 414 by a turning operation of the turning handle 415 are attached to the turning handle 415 provided on the free end side. From the above, the opening / closing position of the opening / closing window 322 can be switched in a plurality of stages by only a very simple (one-touch) operation of rotating the rotating handle 415. Easily perform the opening and closing operations or to or half open the 閉窓 322 is fully closed.

  Next, the structure around the hydraulic external extraction valve 430 as a hydraulic external extraction mechanism will be described mainly with reference to FIGS. 21, 23, 42 and 43. FIG. As shown in FIG. 42, on the upper surface of the hydraulic lifting mechanism 22 on the rear side of the upper surface of the transmission case 17, a plurality of hydraulic external take-out valves 430 as hydraulic external take-out mechanisms are arranged side by side in the vertical direction. The hydraulic fluid can be supplied to a work machine such as a front loader or a boom sprayer that is detachably attached to the machine body 2. Each hydraulic external take-out valve 430 is a mechanically operated switching valve, and each hydraulic external take-out valve 430 and the corresponding hydraulic operation lever 54 are interlocked and connected by a push-pull wire 431 as a rope member. In the embodiment, the switching spool of each hydraulic external take-off valve 430 is interlocked and connected to the corresponding hydraulic operation lever 54 via the push-pull wire 431. As the hydraulic operation levers 54 are turned, the corresponding hydraulic external take-off valves 430 are switched. As described above, each hydraulic operation lever 54 is disposed on the left side column 42 (see FIG. 2). However, the number of hydraulic external take-off valves 430 is determined according to the number of hydraulic equipment for work implements that are mounted as necessary, and is not particularly limited.

  The hydraulic external take-out valve 430 and the hydraulic operation lever 54 can be attached as an option when shipped or retrofitted. In other words, the tractor 1 can be equipped with a work machine such as a front loader or a boom sprayer, and is usually shipped with a rotary cultivator that is a ground work machine and no other work machines attached. Assuming the use of this working machine, an appropriate number of hydraulic external take-out valves 430 and hydraulic operation levers 54 can be optionally attached. The number of option settings is usually 4 or less, and can be applied to most work machines.

  On the other hand, as shown in FIGS. 21, 23, 42, and 43, clamp portions for supporting the push-pull wires 431 are provided on the left and right sides of the rear cover plate 314 located behind the control seat 8. 432 is formed. In the embodiment, the clamp portion 432 is formed by punching the right side portion of the rear cover plate 314 and bending it backward. A pair of upper and lower triangular blocks 433 are fixed by welding to the right and left inner sides of the rear lower frame 310 on the right side. The upper and lower triangular blocks 433 and the right rear lower frame 310 are welded and fixed to the upper and lower and right edges of the clamp portion 432 of the rear cover plate 314.

  A fitting hole 434 through which the push-pull wire 431 is inserted is formed in the clamp part 432. The same number of fitting holes 434 as the hydraulic external take-out valves 430 (four in the embodiment) are provided in the vertical direction with respect to the clamp portion 432. A ring-shaped grommet 435 made of a soft elastic material is fitted in the middle portion of each push-pull wire 431. The longitudinal midway part of each push-pull wire 431 is fitted and fixed to the fitting hole 434 of the clamp part 432 through a grommet 435 by forced fitting. Each fitting hole 434 of the clamp part 432 is closed by a push-pull wire 431 and a grommet 435. Each push-pull wire 431 is inserted through the fitting hole 434 of the clamp portion 432 into the cabin 7 (inside the area surrounded by the cabin frame 300).

As can be seen from the above description and FIGS. 21, 23, 42 and 43, the cabin frame 300 constituting the framework of the cabin 7 covering the control seat 8 on the traveling machine body 2 and the detachable to the traveling machine body 2 A hydraulic external take-out mechanism 430 that supplies hydraulic oil to a working machine mounted on the machine, a plurality of hydraulic operation levers 54 that manually operate the hydraulic external take-out mechanism 430, the hydraulic external take-out mechanism 430, and the hydraulic operation levers 54 In the work vehicle 1 including the cord member 431 that interlocks and connects the cover plate 314 attached to the cabin frame 300, a clamp portion 432 for the cord-like member 431 is formed on the cover plate 314 by punching and bending. In addition, since the clamp part 432 is fixed to the cabin frame 300 by welding, the midway part of each cord-like member 431 is long. The can supported by the clamp portion 432 formed in the cover body 314, to prevent appropriately the cord-like member 431 to each other tangling of can orderly placing the respective cord-shaped member 431. The wiring work of each of the cord-like members 431 can be easily performed. Further, the cover plate 314 can be used as a strength member of the cabin frame 300 (rear lower frame 310), so that the overall rigidity of the cabin frame 300 can be improved.

  Further, the clamp portion 432 is formed with a fitting hole 434 through which the cord-like member 431 is inserted, and the cord-like member 431 is attached to the fitting hole 434 through a grommet 435 made of an elastic material by forced fitting. Therefore, the cord-like member 431 can be inserted and attached to the clamp part 432 in a one-touch manner, and the number of assembling steps can be reduced. Therefore, the workability of attaching the cord-like member 431 to the clamp part 432 can be improved. Furthermore, since the grommet 435 is made of an elastic material, the sealing performance of the clamp portion 432 can be reliably ensured.

  Next, a structure for managing the cabin 7 internal pressure will be described with reference to FIGS. 21, 23, and 42 to 44. As shown in FIGS. 42 to 44, an inside air discharge case 436 is provided on the lower rear side of the cabin 7 as an inside air discharge part that discharges the air in the cabin 7 to the outside when the side door 323 is closed. In the embodiment, a pair of left and right communication holes 437 are formed in the left and right other side portions (the left side portion located on the opposite side of the clamp portion 432) of the rear cover plate 314 located behind the control seat 8 (FIG. 21). 23, 43 and 44). A ventilation plate 438 in which ventilation holes are formed in a matrix shape is disposed at both communication holes 437 of the rear cover plate 314 so as to overlap from the rear. The left and right communication holes 437 and the ventilation plate 438 are covered from behind by an inside air discharge case 436 having a triangular cross section. The inside air discharge case 436 is detachably fastened to the back surface of the rear cover plate 314 via the ventilation plate 438. That is, the inside air discharge case 436 is attached to the lower rear portion of the cabin 7 from the outside.

  The front side of the inside air discharge case 436 opens forward. A pair of left and right openings 439 are formed on the lower surface side of the inside air discharge case 436. Each opening 439 is fitted and fixed with a discharge port body 440 for releasing air made of a soft elastic material. A cut 441 is formed in each discharge port body 440. Usually, the notch 441 is closed, and the airtightness in the cabin 7 is maintained. When the side door 323 is closed, the air in the cabin 7 is abruptly compressed and the internal pressure of the cabin 7 increases, so the notches 441 of each discharge port body 440 are opened and the air in the cabin 7 is released to the outside (air venting). The cabin 7 is maintained in a positive pressure state.

  As is clear from the above description and FIGS. 21, 23, and 42 to 44, the cabin 7 that covers the control seat 8 on the traveling machine body 2, and the side door 323 that opens and closes the left and right sides of the cabin 7. In the work vehicle 1 including the inside of the cabin 7, an inside air discharge portion 436 that releases the air in the cabin 7 to the outside when the side door 323 is closed is provided on the lower back side of the cabin 7. At the time of closing, the air in the cabin 7 can be released from the inside air discharge portion 436, and the inside of the cabin 7 can be easily maintained in a positive pressure state. As a result, the side door 323 can be closed smoothly.

Further, since the inside air discharge part 436 is attached to the lower back of the cabin 7 from the outside and the discharge port body 440 is provided on the lower surface side of the inside air discharge part 436, the cabin 7 is connected via the discharge port body 440. It is possible to accurately prevent rainwater and the like from entering inside. Further, in the embodiment, since a plurality of (in this case, two) discharge port bodies 440 are provided in the inside air discharge portion 436, the cabin 7
There is also an advantage that it is easy to cope with a large atmospheric pressure change (internal pressure change).

  Next, the structure of the board support plate 308 and its periphery will be described with reference to FIGS. 19, 22 and 45 to 47. FIG. 19, 22 and 45, a vertically long board support plate 308 for fixing and supporting the dashboard 33 is connected to the left and right inner end sides of the front lower plate plate 307 connected to the lower end side of each front column 301. The board support plate 308 is erected between the left and right front columns 301. As can be seen from the connection relationship between the left and right front columns 301 and the front lower plate plate 307, the board support plate 308 is one of the components of the cabin frame 300 and constitutes a strength member of the cabin frame 300. On the other hand, a windshield 321 is disposed on the front side of the cabin frame 300, that is, in an area surrounded by the left and right front columns 301, the front beam members 303, and the left and right front lower plate plates 307. As shown in FIGS. 46 and 47, the board support plate 308 is located on the cabin 7 inner side with respect to the windshield 321. The windshield 321 covers the front side of the board support plate 308. The windshield 321 is disposed on the front side of the cabin 7 without forming a notch.

  As shown in FIG. 47, not only the steering column 32 and the dashboard 33 described above are attached to the board support plate 308, but also a brake valve 254 for braking the wheels 3 and 4 of the traveling machine body 2, and a brake valve 254. A brake pedal 35 for operating is attached. The brake valve 254 and the brake pedal 35 are supported on the board support plate 308. In this case, through holes 253 and 442 penetrating in the front-rear direction are formed in both the windshield 321 and the board support plate 308. A brake valve 254 is inserted into and fixed to the through holes 253 and 442. The front end side of the brake valve 254 protrudes forward of the cabin 7 from both through holes 253 and 442. A front wiper 251 for cleaning the windshield 321 is provided near the center of the windshield 321 (see FIG. 46). The drive shaft 252 of the front wiper 251 passes through the windshield 321 and is pivotally supported on the upper portion of the board support plate 308. A wiper drive case 443 accommodating a wiper motor (not shown) for driving the drive shaft 252 of the front wiper 251 is attached to the upper rear side of the board support plate 308 (see FIG. 47).

  As apparent from the above description and FIGS. 19, 22, and 45 to 47, the cabin frame 300 constituting the framework of the cabin 7 that covers the control seat 8 on the traveling body 2 and the front side of the cabin 7 are shown. In the work vehicle 1 including the windshield 321 that covers the cabin frame 300, the cabin frame 300 includes a board support plate 308 that supports the dashboard 33 located in front of the control seat 8, and is closer to the interior of the cabin 7 than the windshield 321. Since the board support plate 308 is positioned and the board support plate 308 is configured as a strength member of the cabin frame 300, the dashboard 33 is supported by the board while improving the rigidity of the cabin frame 300 as a whole. The plate 308 can be supported with high strength. The windshield 321 can be attached to the front side of the cabin 7 without forming a notch, and the processing cost of the windshield 321 and the cost for securing the sealing property can be reduced. The windproof and waterproof structure of the cabin 7 can be easily configured.

  Further, since the brake valve 254 that brakes the wheels 3 and 4 of the traveling machine body 2 and the brake pedal 35 that operates the brake valve 254 are attached to the board support plate 308, the brake pedal 35 that is a movable member. And the brake valve 254 can be supported with high strength on the board support plate 308 which is a strength member of the cabin frame 300.

Further, through holes 253 and 442 penetrating in the front-rear direction are formed in the windshield 321 and the board support plate 308, and the brake valve 254 is inserted and fixed in the through holes 253 and 442, and the front end side of the brake valve 254 Projecting from the through holes 253 and 442 to the front of the cabin 7, the windproof and waterproof structure of the cabin 7 can be easily configured, and the brake pedal 35 is disposed in the cabin 7. Thus, the brake valve 254 and the braking mechanism for braking the wheels 3 and 4 can be easily connected.

  In addition, the structure of each part in this invention is not limited to embodiment of illustration, A various change is possible in the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Tractor 2 Traveling machine body 3 Front wheel 4 Rear wheel 7 Cabin 8 Control seat 300 Cabin frame 301 Front column 302 Rear column 303 Front beam member 304 Rear beam members 304a and 305a Reinforcement plate 305 Side beam member 308 Board support plate 321 Windshield 321 Base bracket 330 Reinforcement plate piece 330a Opening hole 400 Door lock member 401 Reinforcement frame 406 Grip body 408 Hinge stay 409 Hinge cover 410 Stopper bolt 414 Locked block 415 Rotating handle 420a First engagement protrusion 420b Second engagement protrusion 430 Hydraulic external take-out valve 431 Push-pull wire 432 Clamp part 436 Inside air discharge case 444 Sound absorbing material

Claims (2)

A cabin frame that forms a framework of a cabin that covers a control seat on a traveling machine body; and a roof body that is disposed on an upper end side of the cabin frame. The cabin frame includes a pair of left and right front columns and a pair of left and right rear columns. A front beam member that connects the upper end portions of the front struts, a rear beam member that connects the upper end portions of the rear struts, and a space between the upper end portions of the front struts and the rear struts arranged in the front-rear direction. In a tractor having a side beam member to be connected and supporting the roof body with a group of the beam members,
The rear beam member extending in the left-right direction and the left and right side beam members extending in the front-rear direction are both formed in a C-shaped cross section, and the respective longitudinal directions are formed in the openings of the rear beam member and the side beam member. By inserting and fixing a reinforcing plate extending along, at least a longitudinal midway part of the rear beam member and the side beam member is formed in a hollow shape,
While fixing the left and right end surfaces of the rear beam member and the rear end surface of the side beam member to the upper end side surface of the rear column, a pair of left and right braces are formed inside the rear beam member and the left and right side beam members. The reinforcing bracket is fixed, and the presence of the reinforcing bracket is configured to ensure the connection strength between the rear beam member, the left and right side beam members, and the rear column,
The inside of the roof body is divided into two front and rear chambers, the rear chamber of the roof body projects rearward from the rear beam member, the rear chamber is supported by the rear beam member, and the air conditioner is installed in the rear chamber. Contains
Tractor . A tail pipe that releases exhaust gas of an engine mounted on the traveling machine body to the outside is provided on one of the left and right sides of the traveling machine body, the left and right sides of the roof body on the opposite side of the tail pipe, and the rear chamber is disposed outside. It forms an outside air intake that allows communication ,
The outside air intake port is connected to the air conditioner in the rear cover through a communication port formed in a side wall portion closer to the outside air intake port among left and right side wall portions of the rear cover forming the rear chamber. Attaching a ventilation frame to the outside air intake, and attaching a dust filter to the communication port,
On the rear side of the inner roof facing the back of the operator seated in the control seat, an inside air intake port is formed to communicate the inside of the rear cover and the cabin .
The tractor according to claim 1.

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