WO2016060022A1

WO2016060022A1 - Working vehicle

Info

Publication number: WO2016060022A1
Application number: PCT/JP2015/078375
Authority: WO
Inventors: 宮崎　竜一; 健工藤
Original assignee: ヤンマー株式会社
Priority date: 2014-10-15
Filing date: 2015-10-06
Publication date: 2016-04-21

Abstract

Provided is a working vehicle that comprises a cabin 7 mounted on a traveling machine body 2 and having an operator's seat 8 provided therein. The cabin 7 has: a cabin frame 300 constituting a framework; a roof 306 for closing the upper part of the cabin 7; and side doors 323 for closing in an openable manner the left and right sides of the cabin 7. The roof 306 on the upper face side of the cabin 7 has a roof body 361, a front cover 362, and a rear cover 363. The roof 306 is configured divided into: the roof body 361 covering substantially the entire area of the upper face of the cabin 7; and a front cover 362 and the rear cover 363, which serve as lamp covers.

Description

Work vehicle

The present invention relates to a work vehicle such as a tractor for agricultural work or a wheel loader for civil engineering work that pulls a ground work machine such as a tillage work machine or a sowing work machine.

2. Description of the Related Art Conventionally, work vehicles such as agricultural tractors have a cabin that covers a control seat on a traveling machine body (see, for example, Patent Documents 1 and 2). The cabin described in

patent documents

1 and 2 has a cabin frame which constitutes a framework, and a roof body arranged on the upper end side of the cabin frame. The roof body has a structure that can be divided vertically. The cabins described in

Patent Documents

1 and 2 include a cabin frame that constitutes a framework, and side doors that open and close the left and right sides of the cabin.

Japanese Patent Laid-Open No. 2002-67657 JP 2004-345367 A

By the way, regarding the structure of this type of cabin, there is a demand for improving the color and shape of the roof body, and it is also desired to ensure waterproofness.

Regarding the structure of this type of cabin, the cabin that covers the control seat on the traveling aircraft has a cabin frame that constitutes a framework and side doors that open and close the left and right sides of the cabin. In the structure in which the door frame is vertically independent, there is a problem that the side door is likely to have insufficient strength, and the change in the sensation pressure applied to the operator in the cabin cannot be easily eased, and the feeling of closing the door cannot be improved.

This invention makes it a technical subject to provide the work vehicle which improved after examining the above present conditions.

The present invention includes a cabin in which a control seat to be installed in a traveling machine body is provided, and the cabin includes a cabin frame constituting a framework, a roof body that covers an upper portion of the cabin, and left and right side portions of the cabin. In a work vehicle having a side door that can be opened and closed, the roof on the cabin upper surface side includes a roof body, a front cover, and a rear cover, and covers the substantially entire area of the cabin upper surface, and a lamp cover. The roof body is divided into a front cover and a rear cover.

In the tractor, a headlamp is installed in the recess of the front cover, and the front cover and the headlamp are fastened and fixed to the roof body, and the front cover is formed as a lamp cover of the headlamp. In addition, a rear lamp is provided in the recess of the rear cover, the rear cover and the rear lamp are fastened and fixed to the roof body, and the rear cover is formed as a lamp cover of the rear lamp. It is good.

The tractor has a structure in which an air conditioner is installed in a rear portion of the roof main body, and the rear cover includes a bottom plate portion, a back plate portion, and a top plate portion, and includes a bottom plate portion and a top plate portion. The vertical width dimension and the vertical width dimension of the rear part of the roof body are substantially matched, and the rear cover is fitted from the rear side to the rear part of the roof body protruding rearward from the rear part of the cabin frame. It may be a thing.

In the work vehicle, a communication port portion communicating with the inside and outside of the cabin is formed between the roof body and a front upper end side of the cabin frame, and the communication port portion is configured to communicate with the communication port when an internal pressure of the cabin increases. It is good also as what is obstruct | occluded by the internal pressure adjustment body which open | releases a part.

In the work vehicle, the communication port is located between the roof main body and the front upper end side of the cabin frame, and between the front window glass disposed on the front side of the cabin and the front cover. It is good also as what leads out of the said cabin from the downward path | route.

In addition, the present invention includes a cabin that covers a control seat on a traveling machine body, and the cabin can open and close a cabin frame that constitutes a framework, a roof body that is disposed above the cabin frame, and left and right sides of the cabin. In a work vehicle having a side door that is closed, an outside air intake opening is formed on a side surface of the roof body, and a waterproof structure slit is formed in a ventilation frame disposed in the outside air intake opening.

In the tractor, a baffle plate-shaped portion may be formed at a central portion of the ventilation frame, and an outside air suction slit may be disposed on a side edge of the baffle plate-shaped portion.

In the tractor, an outer peripheral frame portion fixed to a side surface of the roof body of the cabin, a baffle plate shape portion similar to an opening formed in the outer peripheral frame portion, and a baffle plate shape portion at an opening edge of the outer peripheral frame portion. The ventilation frame body may be configured by integrally forming a plurality of horizontal crosspieces that connect the outer peripheral edges by synthetic resin molding.

Further, the present invention includes a cabin that covers a control seat on a traveling machine body, and the cabin includes a cabin frame that constitutes a framework, and side doors that open and close the left and right sides of the cabin. A side door frame provided on the side door is formed in a single shape, and the side door frame has an upper door frame portion, a lower door frame portion, and a lateral door frame portion formed by bending a single pipe. , Comprising a branch frame extending obliquely forward and downward from the middle of the lower door frame portion, and supporting the side door glass body on which the side door is formed at the side door frame and the branch frame at five points It is.

In the tractor, an upper end side of the horizontal door frame portion is connected to the rear end side of the upper door frame portion, and a lower end side of the horizontal door frame portion is connected to the rear end side of the lower door frame portion. A U-shaped pipe frame is formed, and the upper and lower ends of the side door frame body are connected to the upper and lower hinges at the rear side of the side door glass body, and the opening / closing handle member at the front side of the side door glass body is While connecting the front end portion of the lower door frame portion, the front end side of the upper door frame portion is fixed to the front end side of the front and rear wide upper portion of the side door glass body, and the rear end side of the lower width portion of the side door glass body is fixed. Further, the lower end side of the branch frame may be fixed.

In the tractor, the upper end of the end surface of the branch frame is welded and fixed to the middle of the lower door frame portion, and the lower end side of the branch frame is extended obliquely forward and downward, and the lower end side of the side door glass body It is good also as what connected the lower end part of the said branch frame.

According to the present invention, the roof body on the upper surface side of the cabin has a roof body, a front cover, and a rear cover, covers the substantially entire area of the upper surface of the cabin, and the front cover and the rear cover as lamp covers. In addition, since the roof body is divided and configured, the front cover and the rear cover can be configured to close the front and rear openings of the roof body, and the roof body (roof body) Designability can be improved easily. While it is possible to improve the appearance by reducing the gap formed before and after the roof body (roof body), it is possible to easily prevent rainwater from entering the inside of the roof body, and the waterproofness of the roof body Can be easily secured.

According to the present invention, a headlamp is installed in the recess of the front cover, the front cover and the headlamp are fastened and fixed to the roof body, and the front cover is used as a lamp cover of the headlamp. And forming a rear lamp in the recess of the rear cover, fixing the rear cover and the rear lamp together to the roof body, and forming the rear cover as a lamp cover of the rear lamp. Therefore, the front cover can be used as a lamp cover of the headlamp, the number of supporting parts of the headlamp can be reduced, and the headlamp can be installed at low cost, Assembling workability of the front cover or the headlamp can be improved, the rear cover can be utilized as the lamp cover of the headlamp, and the number of supporting parts of the headlamp is reduced, Yet it can be disposed of Kigo headlight to low cost and improve the assembling workability of the rear cover or taillight.

According to the present invention, an air conditioner is installed in a rear portion of the roof body, and the rear cover includes a bottom plate portion, a back plate portion, and a top plate portion, and the bottom plate portion and the top plate. The vertical width dimension of the part and the vertical width dimension of the rear part of the roof body are substantially matched, and the rear cover is fitted from the rear side to the rear part of the roof body protruding rearward from the rear part of the cabin frame. Since it is configured, even if the rear portion of the roof body overhangs rearward from the rear window glass of the cabin, the structure can close both the rear side and the lower surface side of the rear portion of the roof body. The rear cover can be easily formed, the waterproof structure of the rear part of the roof body can be easily simplified, and the maintenance workability of the air conditioner installed inside the rear part of the roof body is improved. Kill.

According to the present invention, a communication port portion communicating with the inside and outside of the cabin is formed between the roof body and a front upper end side of the cabin frame, and the communication port portion is configured to communicate with the communication port when an internal pressure of the cabin increases. When the internal pressure of the cabin is increased, for example, when the side door is closed, the communication port portion is opened by the internal pressure adjusting body to close the cabin. The air can be discharged to the outside, and the cabin is easily maintained in a positive pressure state. Therefore, an opening / closing member such as the side door provided in the cabin can be smoothly closed.

According to the present invention, the communication port is located between the roof main body and the front upper end side of the cabin frame, and between the front window glass disposed on the front side of the cabin and the front cover. The communication port portion itself is surrounded by the roof main body, the front cover, and the front window glass through the downward path, and the cabin is connected via the communication port portion. It is possible to accurately prevent rainwater and the like from entering inside.

According to the present invention, since the outside air intake opening is formed on the side surface of the roof body, and the ventilation frame body disposed in the outside air intake opening is formed with a waterproof structure slit, the ventilation frame body The slit can be formed in a place where it is difficult to visually recognize the appearance of the airframe, improving the design of the ventilation frame, eliminating the need for separate parts for waterproofing, reducing the number of parts, and simplifying assembly work, etc. And can be configured at low cost. That is, waterproofness can be easily ensured while the design of the roof body can be easily improved.

According to the present invention, a baffle plate-shaped portion is formed in the central portion of the ventilation frame body, and an outside air suction slit is arranged on a side edge of the baffle plate-shaped portion, so that a large area that is easy to visually recognize in appearance. The baffle plate-shaped portion can be formed on the external air suction slit, and the outside air suction slit can be formed in a shape that is difficult to visually recognize, so that the design of the ventilation frame can be easily improved, and the ventilation frame can be manufactured at low cost. Can be installed.

According to the present invention, the outer peripheral frame portion fixed to the roof main body side surface of the cabin, the baffle plate shape portion similar to the opening formed in the outer peripheral frame portion, and the baffle plate shape at the opening edge of the outer peripheral frame portion The ventilation frame body is formed by integrally forming a plurality of horizontal beam-like bodies that connect the outer peripheral edges of the parts by synthetic resin molding, so that the ventilation frame body can be configured as a single part. In addition, while being lightweight and low-cost, the structure for attaching and detaching the ventilation frame can be simplified, and maintenance workability of the air conditioner can be improved.

According to the present invention, a side door frame provided on the side door is formed in a single shape, and the side door frame is formed by bending a single pipe and forming an upper door frame portion, a lower door frame portion, and a lateral door frame portion. A side frame having a door frame portion and extending obliquely forward and downward from the middle of the lower door frame portion, wherein the side door glass body on which the side door is formed is formed on the side door frame and the branch frame. The upper and lower hinges at the rear part of the side door glass body and the opening / closing handle member at the front part of the side door glass body can be integrally connected by the side door frame. While the branch frame can easily secure the rigidity of the side door glass body, Can form a Idodoagarasu body can be easily improved design of the side door.

According to the present invention, the upper end side of the horizontal door frame portion is connected to the rear end side of the upper door frame portion, and the lower end side of the horizontal door frame portion is connected to the rear end side of the lower door frame portion. The upper and lower ends of the horizontal door frame part are connected to the upper and lower hinges at the rear part of the side door glass body, and the opening / closing handle member at the front part of the side door glass body. A front end portion of the lower door frame body, and a front end side of the upper door frame portion is fixed to a front end side of the wide front and rear upper portion of the side door glass body. Since the lower end side of the branch frame is fixed to the end side, the cabin can be easily secured with the rigidity of the side door glass body formed of a single large area transparent glass. A feeling of closed door against such pressure difference between the outside can be easily improved. The change in sensation pressure applied to the operator in the cabin can be reduced. The intensity | strength of the said side door glass body formed in the shape which ensured side visual recognition space and boarding / alighting space can be improved easily.

According to the present invention, the upper end of the end surface of the branch frame is welded and fixed to the middle of the lower door frame portion, and the lower end side of the branch frame is extended obliquely forward and downward. Since the lower end portion of the branch frame is connected to the lower end side, welding of the branch frame for connecting the branch frame to the lower door frame portion can be simplified. The side door glass body can be assembled as a part of the side door frame, the side door frame and the branch frame can be configured as a single part, and can be manufactured at a light weight and low cost. And the side door frame attachment / detachment structure can be simplified.

It is a left view of a tractor. It is a right view of a tractor. It is a top view of a tractor. It is left side explanatory drawing of a traveling body. It is right side explanatory drawing of a traveling body. It is a top view of a traveling body. It is the perspective view which looked at the traveling body from the left rear. It is the perspective view which looked at the traveling body from the right rear. It is the expansion perspective view which looked at the traveling body from the left side. It is the expansion perspective view which looked at the traveling body from the right side. It is the perspective view which looked at the traveling body from the left front. It is the perspective view which looked at the traveling body from the right side. It is left side sectional drawing of the roof body of a cabin. It is left sectional drawing of a roof body front part. It is left sectional drawing of a roof body rear part. It is a left sectional view of the middle part of the roof body. It is the perspective view which looked at the roof of the cabin from the left rear. It is a partial expanded sectional view of FIG. It is a left view of the right side door of a cabin. It is the perspective view which looked at the right side door from the left rear. It is the perspective view which looked at the right side door from the left upper side. It is the perspective view which looked at the attachment part of the opening-and-closing handle member of the left side door from the right side rear. FIG. 23 is a sectional view taken along line XXII-XXII in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings of a farm tractor. As shown in FIGS. 1 to 8, the traveling machine body 2 of the tractor 1 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 portion. The pair of left and right rear wheels 4 corresponds to the rear traveling unit. A diesel engine 5 (hereinafter simply referred to as an engine) is mounted on the front portion of the traveling machine body 2, and the tractor 1 is configured to travel forward and backward by driving the rear wheel 4 or the front wheel 3 with the engine 5. . 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 9 for steering the front wheel 3 are arranged. Steps 10 on which the operator gets on and off are provided on the left and right outer sides of the cabin 7. A fuel tank 11 for supplying 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 two parts. 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. 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.

At the rear part of the mission case 17, for example, a hydraulic lifting mechanism 22 that lifts and lowers a ground working machine (not shown) such as a rotary tiller is detachably attached. The ground work machine is connected to the rear portion of the transmission case 17 via a three-point link mechanism 111 including 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 projecting a PTO driving force to a ground working machine such as a rotary tiller is provided to project rearward.

A flywheel 26 (see FIGS. 4 to 6, 10, and 11) is connected to an output shaft (piston rod) of the engine 5 that protrudes backward 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. (See FIGS. 4 to 6). As shown in FIG. 13, a hydraulic continuously variable transmission 500, a forward / reverse switching mechanism 501, travel transmission gear mechanisms 502, 503, 504, a rear wheel differential gear mechanism 506, and the like are arranged inside the mission case 17. Yes. 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 shifted by the hydraulic continuously variable transmission 500 and the traveling transmission gear mechanism. Is transmitted to the left and right rear wheels 4 via the rear wheel differential gear mechanism 506.

The front wheel output shaft 30 projecting forward from the front lower part of the transmission case 17 is transmitted to the front wheel projecting rearward from the front axle case 13 containing the front wheel differential gear mechanism 507 via the front wheel drive shaft 31. The shaft 508 is connected. Transmission power by the hydraulic continuously variable transmission 500 and the traveling transmission gear mechanism (two-wheel drive / four-wheel drive switching mechanism 504) in the mission case 17 is transmitted from the front wheel output shaft 30, the front wheel drive shaft 31, and the front wheel transmission shaft 508 to the front axle. It is configured to be transmitted to the left and right front wheels 3 via a front wheel differential gear mechanism 507 in the case 13.

Next, the structure inside the cabin 7 will be described with reference to FIG. 3, FIG. 7 and FIG. A steering column 32 is disposed in front of the control seat 8 in the cabin 7. The steering column 32 is erected on the rear side of a 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.

A pair of left and right brake pedals 35 for braking the traveling machine body 2 are disposed on the lower right side of the steering column 32. On the upper 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 is disposed. On the lower left side of the steering column 32, a clutch pedal 37 for disengaging the outputs of the hydraulic continuously variable transmission 500 (forward low speed hydraulic clutch 537, forward high speed hydraulic clutch 539, reverse hydraulic clutch 541) is disposed. . The master control solenoid valve 635 is turned on by stepping on the clutch pedal 37, and the forward output or the reverse output of the hydraulic continuously variable transmission 500 is cut off (see FIG. 14).

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 causing the erroneous operation preventing body 38, which is a contact prevention tool, to protrude outward from 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. ing. An operation display panel 39 incorporating a liquid crystal panel is provided on the upper rear side of the dashboard 33.

Accelerator pedal 41 for controlling the rotational speed of the engine 5 or the vehicle speed is disposed on the right side of the steering column 32 on 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. Left and right side columns 42 are arranged on both left and right sides of the control seat 8. Between the control seat 8 and the left side column 42, a parking brake lever 43 that maintains the left and right rear wheels 4 in a braking state, and an ultra-low speed that forcibly and significantly reduces the forward travel speed (vehicle speed) of the tractor 1 A lever 44 (creep operation lever), a sub-transmission lever 45 that switches the output range of the traveling sub-transmission gear mechanism 503 in the mission case 17, and a PTO transmission lever 46 that switches the driving speed of the PTO shaft 25 are arranged. . A differential lock pedal 47 for turning on and off the differential drive of the left and right rear wheels 4 is disposed below the control seat 8. A reverse PTO lever 48 for performing an operation of driving the PTO shaft 25 in the reverse direction is disposed on the left rear side of the control seat 8 (see FIG. 10).

Between the control seat 8 and the right 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 includes a main transmission lever 50 that increases / decreases the traveling speed of the tractor 1, a dial type work unit position dial 51 (elevating dial) that manually changes and adjusts the height position of a ground work machine such as a rotary tiller. It has. 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.

In the right side column 42, in order from the front side, a throttle lever 52 that sets and holds the rotational speed of the engine 5, and a PTO clutch switch 53 that interrupts power transmission from the PTO shaft 25 to a work machine such as a rotary tiller A plurality of hydraulic operation levers 54 (SCV levers) for switching the hydraulic external take-off valve 430 (see FIG. 14) arranged on the upper surface side of the mission case 17 are arranged. Here, the hydraulic external take-off valve 430 is for controlling supply of hydraulic oil to hydraulic equipment of a work machine such as a front loader that is 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 (four stations).

Furthermore, as shown in FIGS. 9 to 12, etc., left and right front support bases 96 that support the front side of the cabin 7 and left and right rear support bases 97 that support the rear part of the cabin 7 are provided. The front support 96 is bolted to the front and rear intermediate portions of the outer side surfaces of the left and right aircraft frames 15, and the front bottom of the cabin 7 is anti-vibrated on the upper surface of the front support 96 via the anti-vibration rubber body 98. The rear support base 97 is bolted to the middle portion of the left and right widths of the upper surfaces of the left and right rear axle cases 19 that are horizontally extended in the left-right direction, and the vibration-proof rubber body 99 is attached to the upper surface side of the rear support base 97. The rear bottom portion of the cabin 7 is supported by vibration isolation. That is, the diesel engine 5 and the cabin 7 are supported by the traveling machine body 2 (the engine frame 14, the machine frame 15, and the rear axle case 19, which are integrally connected) via the plurality of vibration-proof rubber bodies. . Further, as shown in FIGS. 4 and 5, etc., the rear support base 97 is disposed on the upper surface side of the rear axle case 19, and the steady bracket 101 is disposed on the lower surface side of the rear axle case 19. The fastening bracket 101 is fastened with bolts, and both ends of the steady rod body 103 with turnbuckles that can be expanded and contracted are connected to the middle portion of the lower link 23 and the steady bracket 101 that extend in the front-rear direction. The horizontal vibration of 23 is prevented.

Next, the diesel engine 5 and the engine room structure under the bonnet 6 will be described with reference to FIGS. The diesel engine 5 has a cylinder head mounted on a cylinder block having a built-in engine output shaft and piston, and is connected to an air cleaner 221 via a turbocharger 211 on the right side surface of the diesel engine 5 (cylinder head). And an EGR device 210 that recirculates a part of the exhaust gas from the exhaust manifold 204, and a part of the exhaust gas discharged to the exhaust manifold 204 is returned to the intake manifold 203. The maximum combustion temperature during high-load operation is lowered, and NOx (nitrogen oxide) emissions from the diesel engine 5 are reduced. On the other hand, the exhaust manifold 204 connected to the tail pipe 229 and the turbocharger 211 are arranged on the left side surface of the diesel engine 5 (cylinder head). That is, the intake manifold 203 and the exhaust manifold 204 are distributed and arranged on the left and right side surfaces along the engine output shaft in the engine 5. A cooling fan 206 is disposed on the front side of the diesel engine 5 (cylinder block).

In addition, as shown in FIGS. 4 to 8 and the like, the diesel engine 5 includes a continuously regenerative exhaust gas purification device 224 (DPF) disposed on the upper surface side (above the exhaust manifold 204) of the diesel engine 5, and exhaust gas. A tail pipe 229 is connected to the exhaust side of the purification device 224. The exhaust gas purifying device 224 removes particulate matter (PM) in the exhaust gas discharged from the engine 5 through the tail pipe 229 to the outside of the machine, and at the same time, carbon monoxide (CO) and carbonization in the exhaust gas. Hydrogen (HC) is configured to be reduced.

Further, as shown in FIGS. 1 to 3 and the like, the bonnet 6 has a front grill 231 at the front lower side, and covers the upper surface side and the front surface side of the engine room 200. Side engine covers 232 formed of a perforated plate are arranged on the lower left and right sides of the bonnet 6 to cover the left and right sides of the engine room 200. That is, the hood 6 and the engine cover 232 cover the front, upper, and left and right sides of the diesel engine 5.

Further, as shown in FIGS. 4 to 8, a radiator 235 having a fan shroud 234 attached to the back side is erected on the engine frame 14 so as to be positioned on the front side of the engine 5. The fan shroud 234 surrounds the outer peripheral side of the cooling fan 206 and allows the radiator 235 and the cooling fan 206 to communicate with each other. An air cleaner 221 is disposed above the front surface of the radiator 235. In addition to the above intercooler, an oil cooler, a fuel cooler, and the like are installed on the front side of the radiator 235.

On the other hand, as shown in FIGS. 9 to 12 and the like, the pair of left and right body frames 15 are connected by a support beam frame 236. The support beam frame 236 is bolted to the left and right airframe frames 15 and is erected on the front end portions (rear side of the engine 5) of the left and right airframe frames 15, and the rear engine legs 237 having vibration-proof rubber bodies. The rear part of the diesel engine 5 is connected to the upper surface of the support beam frame 236 via As shown in FIGS. 1, 2, 4, 5, 11, and 12, left and right front engine legs 238 having anti-vibration rubber bodies are provided in the middle of the pair of left and right engine frames 14. The left and right side surfaces of the front part of the diesel engine 5 are connected to each other. That is, the front side of the diesel engine 5 is supported on the engine frame 14 by vibration isolation, and the rear part of the diesel engine 5 is supported on the front end sides of the pair of left and right body frames 15 via the support beam frame 236.

Next, with reference to FIGS. 4 to 12, the mounting structure of the mission case 17, the hydraulic lifting mechanism 22 and the three-point link mechanism 111 will be described. The transmission case 17 includes a front transmission case 112 having a main transmission input shaft 28 and the like, a rear transmission case 113 having a rear axle case 19 and the like, and a front side of the rear transmission case 113 on the rear side of the front transmission case 112. An intermediate case 114 to be connected is provided. The rear ends of the left and right machine body frames 15 are connected to the left and right side surfaces of the intermediate case 114 via the left and right upper and lower machine

body connecting shafts

115 and 116. That is, the rear end portions of the left and right airframe frames 15 are connected to the left and right side surfaces of the intermediate case 114 by the two upper airframe connecting shaft bodies 115 and the two lower airframe connecting shaft bodies 116. The transmission case 17 is integrally connected to form the rear part of the traveling machine body 2, and the front transmission case 112 or the power transmission shaft 29 is disposed between the left and right machine body frames 15, so that the front transmission case is provided. 112 and the like are protected. The left and right rear axle cases 19 are attached to the left and right sides of the rear transmission case 113 so as to protrude outward. In the embodiment, the intermediate case 114 and the rear transmission case 113 are made of high-rigid cast iron, while the front transmission case 112 is made of aluminum die cast that is lightweight and has good workability.

According to the above configuration, since the transmission case 17 is divided into the three parts of the front transmission case 112, the intermediate case 114, and the rear case 113, parts such as shafts and gears are attached to the cases 112 to 114, respectively. After being assembled in advance, the front transmission case 112, the intermediate case 114, and the rear transmission case 113 can be assembled. Therefore, the assembly of the mission case 17 can be performed accurately and efficiently.

The left and right rear axle cases 19 are attached to the left and right sides of the rear transmission case 113, and the middle of the high-rigidity structure connecting the front transmission case 112 and the rear transmission case 113 to the left and right body frames 15 constituting the traveling vehicle body 2. Since the case 114 is connected, for example, with the intermediate case 114 and the rear transmission case 113 attached to the body frame 15, only the front transmission case 112 is removed, and a hydraulic continuously variable transmission (not shown) or the like is installed. Maintenance or repair work such as replacement of a shaft or gear inside the provided front transmission case 112 can be performed. Therefore, the frequency of the disassembling work for removing the entire mission case 17 from the tractor 1 can be remarkably reduced, and the workability at the time of maintenance and repair can be improved.

Further, while the intermediate case 114 and the rear transmission case 113 are made of cast iron, and the front transmission case 112 is made of aluminum die cast, the intermediate case 114 connected to the body frame 15 and the left and right rear axle cases 19 are made. The rear transmission case 113 to which the two are connected can be configured with high rigidity as a strength member constituting the traveling machine body 2. In addition, the front transmission case 112 that is not a strength member can be reduced in weight. Therefore, it is possible to reduce the weight of the transmission case 17 as a whole while sufficiently securing the rigidity of the traveling machine body 2.

On the other hand, as shown in FIGS. 4 to 12, the hydraulic lifting mechanism 22 includes left and right hydraulic lift cylinders 117 that are controlled by operation of the working unit position dial 51 and the upper surface of the rear transmission case 113 of the transmission case 17. The left and right lift arms 120 are connected to the left and right lower links 23, and the left and right lift arms 120 are pivotally supported via a lift fulcrum shaft 119 on an openable and closable upper surface lid 118. Left and right lift rods 121 are provided. A part of the right lift rod 121 is formed by a horizontal cylinder 122 for hydraulic control, and the length of the right lift rod 121 is configured to be adjustable by the horizontal cylinder 122.

7, 8, 10, etc., the top link hinge 123 is fixed to the back side of the top cover 118, and the top link 24 is connected to the top link hinge 123 via a hinge pin. When the ground work machine is supported by the top link 24 and the left and right lower links 23, the piston of the horizontal cylinder 122 is expanded and contracted to change the length of the right lift rod 121. The angle is configured to change.

Next, the detailed structure of the cabin 7 will be described with reference to FIGS. 1, 2, and 13 to 22. FIG. 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 301, 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.

It should be noted that the longitudinal ends of the left and right bottom frames 311 extending in the front-rear direction are connected to the lower ends of the front column 301 and the rear column 302. The floor plate 40 is stretched on the upper surface side of the left and right bottom frames 311, the dashboard 33 is erected on the front end side of the floor plate 40, and the steering handle 9 is installed on the rear surface side of the dashboard 33 via the steering column 32. . A brake pedal 35 and the like are disposed on the front upper surface side of the floor board 40, and the control seat 8 is attached to the rear upper surface side of the floor board 40.

The front window glass 321 is disposed on the front side of the cabin frame 300, that is, in the region of the front portion of the cabin 7 surrounded by the left and right front columns 301, the front beam member 303, and the front end of the floor board 40. A rear window glass 322 is disposed on the rear surface side of the cabin frame 300, that is, on the rear upper portion of the cabin 7 surrounded by the left and right rear columns 302 and the rear beam member 304. Left and right 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 of the side of the cabin 7 surrounded by the front struts 301 and the rear struts 302 arranged in the front-rear direction. Each 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. The rear window glass 322 is attached to the rear beam member 304 through a pair of left and right hinges so that the rear window glass 322 can be opened and closed (can be turned up and down).

As is apparent from the arrangement structure of the front window glass 321, the rear window glass 322, and the left and right side doors 323, the

columns

301 and 302 and the

beam members

303, 304, and 305 are arranged on the sides of the cabin 7 (cabin frame 300). Located in the department. That is, it is possible to widen windows on the front, rear, left and right sides of the cabin frame 300. In the embodiment, a front window glass 321, a rear window 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, the rigidity of the cabin frame 300 can be ensured while ensuring a wide field of view of the operator in the front-rear and left-right directions.

Next, the structure of the roof body 306 will be described with reference to FIGS. The roof body 306 attached to the upper end side of the cabin frame 301 has a roof main body 361 that is an exterior, a front cover 362 disposed on the front side of the roof main body 361, and a rear side of the roof main body 361 that protrudes rearward from the rear beam member 304. A rear cover 363 is provided. The roof body 361 has a hollow interior formed by a synthetic resin blow molding process. The roof body 306 on the upper surface side of the cabin 7 includes a roof body 361, a front cover 362, and a rear cover 363. The roof body 361 covers substantially the entire area of the upper surface of the cabin 7, and the front cover 362 and the rear cover 363 as lamp covers. Further, the roof body 306 is divided.

Further, the rear side of the roof main body 361 extends rearward from the rear beam member 304. A headlamp 333 is installed in the recess 334 of the front cover 362, and the front cover 362 and the headlamp support stay 331 of the headlamp 333 are fastened and fixed to the roof main body 361 with bolts 332. A front cover 362 is formed as a lamp cover 333, and a headlight 337 is installed in a recess 339 of the rear cover 363, and the rear cover 363 and the headlight support stay 335 are bolted to the roof body 361. The rear cover 363 is formed as a lamp cover of the rear lamp 337 by fastening together and fixing 336. In the night work, the left and right headlamps 333 illuminate the front of the tractor 1, while the left and right headlamps 337 illuminate the rear of the tractor 1 (work machine, etc.).

In the roof body 306, an air conditioner 364 that manages the air conditioning in the cabin 7 is accommodated in the rear part (the rear cover 363 arrangement side) of the roof body 361. 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 inside the rear side of the roof main body 361 protruding rearward from the upper part of the rear beam member 304, the overall height of the cabin 7 is prevented from becoming higher than necessary. The air-conditioning case 360 is fixedly mounted on the rear beam member 304. The air conditioning case 360 is formed in a square box shape having an upward opening, and the air conditioner 364 is installed inside the air conditioning case 360 from above. The bolt 346 (see FIG. 16) that fastens the roof main body 361 to the side beam member 305 is detached, and the roof main body 361 is removed, so that the inside of the air conditioning case 360 is opened upward, and maintenance of the air conditioner 364 is performed. It is configured as follows.

As shown in FIG. 15, the rear cover 363 includes a bottom plate portion 363a, a back plate portion 363b, and an upper surface plate portion 363c. The vertical width of the bottom plate portion 363a and the upper surface plate portion 363c, and the roof body 361 The rear cover 363 is configured to be fitted from the rear side to the rear part of the roof main body 361 that has the vertical width dimension of the rear part substantially matched and protrudes rearward from the rear part of the cabin frame 300. Three long grooves 363d are formed in the front end edge of the upper surface plate portion 363c, and the front end edge of the upper surface plate portion 363c is fastened and fixed to the rear portion of the roof main body 361 by three bolts 359 penetrating the three long grooves 363d. The three bolts 359 are loosened, and the rear cover 363 is moved rearward so that it can be detached.

The left and right sides of the roof main body 361 are formed as inclined surfaces that are cut off obliquely downward toward the left and right inner sides. An outside air intake port 366 is formed on a side portion of the roof main body 361 (roof body 306). The outside air intake port 366 faces the air conditioner 364 in the rear cover 363 from the left side through a communication port 358 formed in the left side wall portion of the air conditioning case 360. A lattice-shaped ventilation frame body 367 is attached to the outside air intake port 366. The outer peripheral frame portion 367a fixed to the side of the roof body 361 of the cabin 7, the baffle plate-shaped portion 367b similar to the opening formed in the outer peripheral frame portion 367a, and the baffle plate-shaped portion 367b of the opening edge of the outer peripheral frame portion 367a A plurality of horizontal crosspieces 367 c that connect the outer peripheral edges are integrally formed by synthetic resin molding to constitute a ventilation frame 367. A baffle plate-shaped portion 367b having substantially the same size as the outside air intake port 366 is formed in the central portion of the ventilation frame body 367, and the horizontal beam-like bodies 367c are arranged at equal intervals on the side edge of the baffle plate-shaped portion 367b. Outside air suction slits 367d are formed between the horizontal bars 367c.

In addition, a filter support frame portion 367e similar to the opening formed in the outer peripheral frame portion 367a is formed on the inner side surface of the ventilation frame body 367, and the outer filter 396 is inserted into the filter support frame portion 367e to be inserted into the outside air intake port 366. Is installed. In addition, an outer peripheral frame portion 367a of the ventilation frame body 367 is detachably fastened to the opening edge of the outside air intake port 366 of the roof body 361, and the communication port 358 formed on the left side wall portion of the rear cover 363 is used for dust removal. An inner filter 357 is attached.

With the above configuration, outside air is taken into the air conditioner 364 inside the air conditioning case 360 through the outside air suction slit 367d, the outside filter 396 (outside air intake port 366), and the inside filter 357 (communication port 358). The ventilation frame body 367 is removed from the roof main body 361, and the outer filter 396 is cleaned. Note that the left side surface of the roof main body 361 formed on the inclined surface facing inwardly is recessed inward to form a ventilation frame body mounting recess 361a on the left side surface of the roof main body 361 for mounting the ventilation frame body. An outside air intake port 366 is opened in the recessed portion 361a, and an outside portion of the ventilation frame body 367 that is exposed to the left outside of the roof body 361 is provided in the recessed portion 361a for attaching the ventilation frame body.

As shown in FIG. 14, a communication port portion 450 communicating with the inside and outside of the cabin 7 is formed between the roof body 306 and the front upper end side of the cabin frame 300. In the embodiment, a laterally long communication port portion 450 is formed between the lower surface front portion of the roof main body 361 and the front beam member 303. On the upper surface side of the front beam member 303, left and right laterally long internal pressure adjusting bodies 451 made of a soft elastic material (for example, foamed rubber or foamed urethane) are attached. The front edge side of the internal pressure adjusting body 451 extends so as to protrude forward from the upper surface of the front beam member, and the forward protruding portion is a tongue-like portion 451a that can be bent and deformed in the vertical direction. A tongue-like portion 451a of the internal pressure adjusting body 451 closes the communication port 450 between the roof main body 361 and the front beam member 303 so as to be opened and closed.

Usually, the tongue-like portion 451a is closed, and the airtightness in the cabin 7 is maintained. When the side door 323 and the rear window glass 322 are closed, the air in the cabin 7 is abruptly compressed and the internal pressure of the cabin 7 increases, so that the tongue-like portion 451a of the internal pressure adjusting body 451 opens and the air in the cabin 7 The air is released to the outside (air bleeding is performed), and the cabin 7 is maintained in a positive pressure state.

As shown in FIG. 14, the communication port portion 450 and the tongue-shaped portion 451 a of the internal pressure adjusting body 451 are located behind the front cover 362 disposed on the front side of the roof body 361. The front cover 362 of the embodiment is attached to the front end of the lower surface of the roof body 361 in a suspended state so as to cover the front upper edge of the front window glass 321 from the front. Between the front cover 362 and the front window glass 321, a downward path 452 (gap) leading to the outside of the cabin 7 is vacant. The communication port 450 and the downward path 452 communicate with each other. For this reason, the communication port portion 450 communicates with the outside of the cabin 7 via the downward path 452.

As apparent from the above description and FIG. 14, a communication port portion 450 that communicates with the inside and outside of the cabin 7 is formed between the roof body 306 and the front upper end side of the cabin frame 300, and the communication port portion 450 is closed by an internal pressure adjusting body 451 that opens the communication port portion 450 when the internal pressure of the cabin 7 increases. For example, the cabin 7 is closed when the side door 323 or the rear window glass 322 is closed. When the internal pressure increases, the communication port portion 450 is opened by the internal pressure adjusting body 451 so that the air in the cabin 7 can be discharged to the outside, and the cabin 7 can be easily maintained in a positive pressure state. As a result, opening / closing members such as the side door 323 and the rear window glass 322 provided in the cabin 7 can be smoothly closed.

The communication port portion 450 is located between the roof main body 361 and the front upper end side of the cabin frame 300, and the front window glass 321 and the front cover 362 disposed on the front side of the cabin 7. The communication port portion 450 itself is surrounded by the roof main body 361, the front cover 362, and the front window glass 321. It is possible to accurately prevent rainwater and the like from entering the cabin 7 via the communication port 450.

Next, the structure of the pair of left and right side doors 323 on the left and right sides of the cabin 7 will be described in detail with reference to FIGS. On the left and right side surfaces of the cabin frame 300, a transparent single glass side door glass body 325 is disposed as a side door 323 that closes the operator getting-on / off portion on the left and right sides of the cabin 7 in an openable and closable manner. The rear end side of the wide front and rear upper part of the side door glass body 325 (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. An opening / closing handle member 400 for switching the side door 323 between a locked state and an unlocked state is provided on the front lower side of the wide front and rear portion of the side door glass body 325 (side door 323). By operating the handle on the outer surface side of the opening / closing handle member 400, the opening / closing handle member 400 is unlocked from the locked state, and the side door 323 is opened / closed. On the inner surface side of the side door glass body 325, a side door frame 402 having a C-shape in a side view for increasing the strength of the side door glass body 325 (side door 323) is disposed.

The side door frame 402 defines an upper door frame portion 402a extending in the front-rear direction along the upper end side of the wide front-rear part of the side door glass body 325, and a wide front-rear upper part and a narrow front-back narrow part of the side door glass body 325. The lower door frame portion 402b extending in the front-rear direction and the side door frame portion 402c extending along the rear end side of the wide front-rear upper portion of the side door glass body 325 are provided. The lower door frame portion 402b is located in the middle of the upper and lower sides of the inner surface of the side door 323 (the boundary portion between the front and rear wide upper portion and the front and rear narrow narrow portion of the side door glass body 325). In the embodiment, the side door frame 402 is positioned so as to surround the wide front and rear upper part on the upper side of the side door 323.

The side door frame 402 is connected to the opening / closing handle member 400 and a pair of upper and lower hinges 324. In the embodiment, the front end side of the lower door frame portion 402 b is connected to the opening / closing handle member 400. The connecting corner portion on the rear end side of the lower door frame portion 402b and the lower end side of the side door frame portion 402c is connected to the lower hinge 324, and the connecting corner portion on the rear end side of the upper door frame portion 402a and the upper end side of the side door frame portion 402c is connected to the upper side. The hinge 324 is connected. That is, the wide front and rear upper portion of the side door glass body 325 is supported by the opening / closing handle member 400, the pair of upper and lower hinges 324, and the side door frame 402. A front end side of the upper door frame portion 402 a is connected to a bolt 404 on the upper side of the front end portion of the wide front and rear side of the side door glass body 325.

The opening / closing handle member 400 is switched to the unlocking direction by grasping with a hand to the middle part of the lower door frame part 402b, that is, the part of the lower door frame part 402b where the operator's hand seated on the control seat 8 can reach. A grip body 406 to be operated is provided. The grip body 406 is linked to the open / close handle member 400 via a wire member built in the lower door frame portion 402b. For example, if the grip body 406 is grasped together with the lower door frame portion 402b, the opening / closing handle member 400 is switched in the unlocking direction via the wire member. As a result, by grasping the grip body 406, the opening / closing handle member 400 is unlocked, and when the operator inside the cabin 7 pushes the side door 323 outward, the side door 323 smoothly opens and rotates.

Further, as shown in FIGS. 19 to 22, the side door frame 402 provided on the side door 323 is formed in a single pipe bent shape, and the side door frame 402 is formed by bending a single pipe. A front and rear width of the side door glass body 325 includes a frame 402a, a lower door frame 402b, and a side door frame 402c, and a branch frame 403 extending obliquely forward and downward from the middle of the lower door frame 402b. A bolt 405 is connected to the lower end side of the branch frame 403 on the rear end side of the narrow portion. That is, the side door glass body 325 on which the side door 323 is formed is supported by the side door frame 402 and the branch frame 403 at five points.

Further, as shown in FIG. 22, the upper end side of the branch frame 403 is formed into an elliptical end surface that is long in the vertical direction by pressing, and the upper surface of the elliptical end surface 403a on the upper end side of the branch frame 403 is formed flat. The flat upper surface of the elliptical end surface 403a is brought into contact with the lower surface in the middle of the frame portion 402b, and the flat upper surface of the elliptical end surface 403a is integrally fixed to the lower surface of the lower door frame portion 402b by welding 406. That is, the upper end of the oval end surface of the branch frame 403 is welded and fixed in the middle of the lower door frame portion 402b, and the lower end side of the branch frame 403 extends obliquely forward and downward. The lower end portion of the branch frame 403 is connected to the lower end side of the lower portion, and the lower portion of the side door glass body 325 having a narrow front and rear width is reinforced by the branch frame 403.

As shown in FIG. 21 to FIG. 23, a weather strip 453 made of elastic rubber or the like is attached to the peripheral edge of the side door glass body 325 over the entire periphery of the side door glass body 325. On the inner surface side of the side door glass body 325, a blindfold 454 made of paint or tape is provided so as to surround the inner peripheral side of the weather strip 453. A sound absorbing material 455 made of urethane foam or the like is attached to the blindfolded portion 454 with an adhesive or the like. Therefore, like the weather strip 453, the sound absorbing material 455 is also attached over the entire circumference of the side door glass body 325.

In the state where the side door 323 is closed, both the weather strip 453 and the sound absorbing material 455 come into contact with the cabin frame 300 from the outside. Specifically, a portion of the weather strip 453 and the sound absorbing material 455 corresponding to the front edge side of the side door glass body 325 is in contact with the front column 301, and a portion corresponding to the upper edge side of the side door glass body 325 is a side beam member. The portion that abuts on 305 and corresponds to the rear edge side of the side door glass body 325 abuts on the rear column 302. A portion corresponding to the lower edge side of the side door glass body 325 is in contact with a fender frame 456 (see FIGS. 21 and 22) that connects the lower end side of the front column 301 and the lower end side of the rear column 302.

According to the above configuration, the presence of the sound absorbing material 455 that contacts the cabin frame 300 when the side door 323 is closed effectively suppresses noise and the like from entering the cabin 7 from the outside via the outer peripheral side of the side door. The soundproofing function of the cabin 7 can be improved.

As shown in FIGS. 1 and 13 to 17, a cabin 7 in which a control seat 8 to be installed in the traveling machine body 2 is provided is provided. The cabin 7 includes a cabin frame 300 constituting a skeleton and an upper portion of the cabin 7. In a work vehicle having a roof body 306 to be closed and side doors 323 that can be opened and closed so that the left and right sides of the cabin 7 can be opened and closed, the roof body 306 on the upper surface side of the cabin 7 includes a roof body 361, a front cover 362, and a rear cover 363. The roof 306 is divided into a roof main body 361 that covers substantially the entire upper surface of the cabin 7, and a front cover 362 and a rear cover 363 as lamp covers. Therefore, the front cover 362 and the rear cover 363 can be configured to close the opening on the front side and the rear side of the roof body 361, and the design of the roof body 306 (roof body 361) can be easily improved. While it is possible to improve the appearance by reducing the gap formed before and after the roof body 306 (roof body 361), it is possible to easily prevent rainwater from entering the roof body 361 and to waterproof the roof body 361. Can be easily secured.

As shown in FIGS. 13 to 17, a headlamp 333 is installed in a recess 334 of the front cover 362, and the front cover 362 and the headlamp 333 are fastened and fixed together to the roof body 361. A front cover 362 is formed as a lamp cover, and a headlight 337 is installed in a recess 339 of the rear cover 363. The rear cover 363 and the headlight 337 are fastened and fixed to the roof body 361. A rear cover 363 is formed as a lamp cover. Therefore, the front cover 362 can be used as a lamp cover for the headlamp 333, the number of supporting parts of the headlamp 333 can be reduced, and the headlamp 333 can be installed at a low cost. Assembling workability of the headlamp 333 can be improved, the rear cover 363 can be used as a lamp cover of the headlamp 337, the number of supporting parts of the headlamp 337 can be reduced, and the headlamp 337 can be installed at low cost. However, the assembly workability of the rear cover 363 or the rear lamp 337 can be improved.

As shown in FIGS. 13 to 17, the air conditioner 364 is provided in the rear part of the roof main body 361. The rear cover 363 includes a bottom plate portion 363a, a back plate portion 363b, and a top plate portion 363c. The vertical width dimension of the bottom plate portion 363a and the top plate portion 363c and the vertical width dimension of the rear portion of the roof main body 361 are substantially matched, and the rear portion of the roof main body 361 protruding rearward from the rear portion of the cabin frame 300 is provided from the rear side. The rear cover 363 is configured to be fitted. Therefore, even if the rear portion of the roof body 361 overhangs rearward from the rear window glass 322 of the cabin 7, the rear cover 363 can be simply configured so that both the rear side and the lower surface side of the rear portion of the roof body 361 can be closed. The waterproof structure of the rear portion of the roof body 361 can be easily simplified, and the maintenance workability of the air conditioner 364 installed in the rear portion of the roof body 361 can be improved.

As shown in FIGS. 1, 17, and 18, a cabin 7 that covers the control seat 8 on the traveling machine body 2 is provided. The cabin 7 includes a cabin frame 300 that forms a skeleton, and a roof body 306 that is disposed above the cabin frame 300. And a side door 323 that closes the left and right sides of the cabin 7 so as to be openable and closable, and has a structure in which an outside air intake 366 is formed on the side surface of the roof body 306, and a ventilation frame disposed in the outside air intake 366. The body 367 is formed with a waterproof structure outside air suction slit 367d. Accordingly, the outside air suction slit 367d can be formed in a place where it is difficult to visually recognize the appearance of the ventilation frame body 367, and the design of the ventilation frame body 367 can be improved, and another part for waterproofing is unnecessary, and the number of parts is reduced. Assembling work can be simplified and can be configured at low cost. That is, waterproofness can be easily ensured while the design of the roof 306 can be easily improved.

17 and 18, a baffle plate-shaped portion 367b is formed in the central portion of the ventilation frame body 367, and an outside air suction slit 367d is disposed on the side edge of the baffle plate-shaped portion 367b. Therefore, the baffle plate-shaped portion 367b can be formed in a large area that is easy to visually recognize, and the outside air suction slit 367d can be formed in a shape that is difficult to visually recognize, and the design of the ventilation frame 367 can be easily improved. The ventilation frame 367 can be installed at low cost.

As shown in FIGS. 17 and 18, the outer peripheral frame portion 367a fixed to the side of the roof body of the cabin, the baffle plate-shaped portion 367b similar to the opening formed in the outer peripheral frame portion 367a, and the opening edge of the outer peripheral frame portion 367a A plurality of horizontal crosspieces 367 c that connect the outer peripheral edges of the baffle plate-shaped portion 367 b are integrally formed by synthetic resin molding to constitute a ventilation frame 367. Therefore, while the ventilation frame body 367 can be configured as a single part, it can be manufactured at a light weight and at a low cost, and the attachment / detachment structure of the ventilation frame body 367 can be simplified, and the workability of the air conditioner 364 can be maintained. Etc. can be improved.

As shown in FIGS. 1 and 19 to 22, a cabin 7 is provided that covers the control seat 8 on the traveling body 2, and the cabin 7 can open and close the cabin frame 300 constituting the framework and the left and right sides of the cabin 7. In a work vehicle having a side door 323 to be closed, a side door frame 402 provided on the side door 323 is formed into a single shape, and the side door frame 402 is formed by bending a single pipe. A side door glass body that includes a branch frame 403 that has a lower door frame portion 402b and a lateral door frame portion 402c and extends obliquely forward and downward from the middle of the lower door frame portion 402b. 325 is supported by the side door frame 402 and the branch frame 403 at five points. Accordingly, the upper and lower hinges 324 at the rear of the side door glass body 325 and the opening / closing handle member 400 at the front of the side door glass body 325 can be integrally connected by the side door frame 402, and the side door frame 402 and the branch frame 403 can be connected. While the rigidity of the side door glass body 325 can be easily secured, the side door glass body 325 can be formed from a single large area transparent glass, and the design of the side door 323 can be easily improved.

As shown in FIGS. 19 to 22, the upper end side of the horizontal door frame portion 402c is connected to the rear end side of the upper door frame portion 402a, and the lower end side of the horizontal door frame portion 402c is connected to the rear end side of the lower door frame portion 402b. The side door frame 402 is configured in a single U-shaped pipe frame shape that is continuously provided, and the upper and lower ends of the side door glass body 325 are connected to the upper and lower hinges 324 at the rear portion of the side door glass body 325, and the side The front end portion of the lower door frame portion 402b is connected to the opening / closing handle member 400 at the front portion of the door glass body 325, while the front end side of the upper door frame portion 402a is fixed to the front end side of the wide front and rear portion of the side door glass body 325. The lower end side of the branch frame 403 is fixed to the rear end side of the lower side of the side door glass body 325 with a narrow front and rear width. Therefore, it is possible to easily ensure the rigidity of the side door glass body 325 formed of a single large-area transparent glass, and it is possible to easily improve the feeling of door closing against a pressure difference between the inside and outside of the cabin 7. The change in sensation pressure applied to the operator in the cabin 7 can be reduced. The strength of the side door glass body 325 formed in a shape that secures the side viewing space and the boarding / alighting space can be easily improved.

As shown in FIGS. 19 to 22, the upper end (elliptical end surface 403a) of the end surface of the branch frame 403 is welded and fixed to the middle of the lower door frame portion 402b, and the lower end side of the branch frame 403 is inclined obliquely forward and downward. The lower end of the branch frame 403 is connected to the lower end side of the side door glass body 325. Therefore, the welding process of the branch frame 403 for connecting the branch frame 403 to the lower door frame part 402b can be simplified. The side door frame 402 can be assembled as a part of the side door frame 402, and the side door frame 402 and the branch frame 403 can be configured as a single part, and can be manufactured at a low cost and at a low cost. The attachment / detachment structure of 325 and the side door frame 402 (branch frame 403) can be simplified.

2 traveling machine body 7 cabin 8 control seat 300 cabin frame 306 roof body 323 side door 333 headlight 334 recess 337 headlight 339 recess 361 roof body 362 front cover 363 rear cover 363a bottom plate 363b back plate 363c top plate 364 air Harmony machine

Claims

The cabin includes a cabin in which a control seat to be installed in the traveling body is installed, and the cabin covers a cabin frame constituting a framework, a roof body that covers an upper portion of the cabin, and a left and right side portion of the cabin that can be opened and closed. In a work vehicle having a side door,
The roof body on the upper surface side of the cabin includes a roof body, a front cover, and a rear cover. The roof body covers substantially the entire area of the upper surface of the cabin, and the roof body includes the front cover and the rear cover. A work vehicle characterized in that the vehicle is divided.
A headlamp is installed in the recess of the front cover, the front cover and the headlamp are fastened and fixed to the roof body together, the front cover is formed as the lamp cover of the headlamp, and the rear cover A rear lamp is provided in the recess of the rear cover, and the rear cover and the rear lamp are fastened and fixed together to the roof body, and the rear cover is formed as a lamp cover of the rear lamp. The work vehicle according to claim 1.
An air conditioner is installed in the rear portion of the roof body, and the rear cover includes a bottom plate portion, a back plate portion, and a top plate portion, and a vertical width dimension of the bottom plate portion and the top plate portion, The rear cover is fitted from the rear side to the rear part of the roof main body, the vertical width dimension of the rear part of the roof main body being substantially the same and protruding rearward from the rear part of the cabin frame. The work vehicle according to claim 1.
A communication port portion communicating with the inside and outside of the cabin is formed between the roof body and a front upper end side of the cabin frame, and the communication port portion is an internal pressure that opens the communication port portion when the internal pressure of the cabin increases. Blocked by the adjustment body,
The work vehicle according to claim 1.
The communication port portion is located between the roof main body and the front upper end side of the cabin frame, and from the downward path between the front window glass disposed on the front side of the cabin and the front cover. Leading out of the cabin,
The work vehicle according to claim 4.
The work vehicle according to claim 1, wherein the roof has a structure in which an outside air intake is formed on a side surface of the roof body, and a waterproof structure slit is formed in a ventilation frame disposed in the outside air intake.
The work vehicle according to claim 6, wherein a baffle plate-shaped portion is formed in a central portion of the ventilation frame body, and an outside air suction slit is disposed on a side edge of the baffle plate-shaped portion.
The outer peripheral frame part fixed to the roof main body side surface of the cabin, the baffle plate shape part similar to the opening formed in the outer peripheral frame part, and the outer peripheral edge of the baffle plate shape part connected to the opening edge of the outer peripheral frame part The work vehicle according to claim 6, wherein the plurality of horizontal bars to be formed are integrally formed by a synthetic resin molding process to constitute the ventilation frame.
A side door frame provided on the side door is formed in a single shape, and the side door frame has an upper door frame portion, a lower door frame portion, and a lateral door frame portion formed by bending a single pipe. A branch frame extending diagonally forward and downward from the middle of the lower door frame part, and supporting the side door glass body on which the side door is formed at five points on the side door frame and the branch frame. The work vehicle according to claim 1.
An upper end side of the side door frame portion is connected to the rear end side of the upper door frame portion, and a lower end side of the side door frame portion is connected to the rear end side of the lower door frame portion. The upper and lower ends of the horizontal door frame part are connected to the upper and lower hinges at the rear part of the side door glass body, and the lower door frame part is connected to the opening / closing handle member at the front part of the side door glass body. The front end of the upper door frame is fixed to the front end of the wide front and rear upper part of the side door glass body, and the branch frame is connected to the rear end of the narrow side of the side door glass body. The work vehicle according to claim 9, wherein a lower end side is fixed.
The upper end of the end surface oval shape of the branch frame is welded and fixed in the middle of the lower door frame portion, the lower end side of the branch frame is extended obliquely forward and downward, and the branch frame is disposed on the lower end side of the side door glass body. The work vehicle according to claim 9, wherein lower ends of the work vehicles are connected.