WO2015147228A1 - Tractor - Google Patents

Tractor Download PDF

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Publication number
WO2015147228A1
WO2015147228A1 PCT/JP2015/059519 JP2015059519W WO2015147228A1 WO 2015147228 A1 WO2015147228 A1 WO 2015147228A1 JP 2015059519 W JP2015059519 W JP 2015059519W WO 2015147228 A1 WO2015147228 A1 WO 2015147228A1
Authority
WO
WIPO (PCT)
Prior art keywords
lift
lower link
transmission case
tractor
cylinder
Prior art date
Application number
PCT/JP2015/059519
Other languages
French (fr)
Japanese (ja)
Inventor
山本　直樹
Original Assignee
ヤンマー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ヤンマー株式会社 filed Critical ヤンマー株式会社
Priority to KR1020167020268A priority Critical patent/KR102121095B1/en
Priority to CN201580013281.7A priority patent/CN106102443B/en
Publication of WO2015147228A1 publication Critical patent/WO2015147228A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
    • A01B59/06—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors
    • A01B59/066—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors of the type comprising at least two lower arms and one upper arm generally arranged in a triangle (e.g. three-point hitches)
    • A01B59/068—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines mounted on tractors of the type comprising at least two lower arms and one upper arm generally arranged in a triangle (e.g. three-point hitches) the lower arms being lifted or lowered by power actuator means provided externally on the tractor
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
    • A01B59/04—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor
    • A01B59/042—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor having pulling means arranged on the rear part of the tractor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/20—Off-Road Vehicles
    • B60Y2200/22—Agricultural vehicles
    • B60Y2200/221—Tractors

Definitions

  • the present invention relates to a tractor for farm work that pulls a ground work machine such as a tillage work machine or a sowing work machine.
  • the lower link fulcrum shaft is passed through the mission case constituting the tractor airframe, and the left and right lower link base ends are supported at both ends of the lower link fulcrum shaft.
  • a lower link will be attached, and there is a problem in designing and manufacturing such that it is not possible to configure different models by changing the specifications of the engine or the lower link by sharing the tractor body.
  • the lower link fulcrum shaft can be divided into left and right parts, and the left and right lower link base ends can be supported by the transmission case via the left and right lower link fulcrum shafts.
  • the left and right lower link fulcrum shafts need to be fixed respectively, and there are structural problems such that the left and right lower link mounting structures cannot be simplified and it is difficult to secure a support load adapted to a large working machine.
  • the present invention has a technical problem to provide an improved tractor by examining the current situation as described above.
  • the invention according to claim 1 includes a traveling machine body on which an engine is mounted, a link mechanism that mounts a work machine on the traveling machine body, and a lifting mechanism that moves the link mechanism up and down.
  • a part of the traveling machine body is a transmission case.
  • a part of the link mechanism is composed of left and right lower links, a part of the elevating mechanism is composed of a lift cylinder, and the tractor is attached to the traveling machine body so that the work machine can be raised and lowered,
  • It is a structure that connects the base end side of the left and right lower links to the transmission case via a lower link fulcrum shaft, and includes a hitch body that is detachably fixed to the outer side surface or the outer bottom surface of the transmission case, Left and right lower link fulcrum shafts are provided on the left and right side portions of the hitch body, and the left and right lower link shafts are provided on the left and right side portions of the hitch body via left and right lower link fulcrum shaft bodies. It is obtained by constituting
  • the hitch body in the tractor according to the first aspect, includes left and right side plate bodies that are fastened to the outside of the side surface portion of the mission case, and a bottom plate body that is fastened to the outside of the bottom surface portion of the mission case. And the lower end of the left and right side plates are integrally fixed to the left and right ends of the bottom plate, and the side and bottom portions of the transmission case are surrounded by the hitch body.
  • a part of the elevating mechanism is configured by left and right lift arms, and the left and right lift arm proximal end sides are connected to the transmission case via a lift fulcrum shaft.
  • the lift cylinder is connected to a cylinder through a cylinder mounting shaft.
  • the lower link is extended outward of the cylinder mounting shaft body, and the lower link fulcrum shaft body or the cylinder mounting shaft body is connected to the transmission case. It is comprised so that attachment or detachment to the said hitch body is possible from the left-right outer direction.
  • the vehicle includes a traveling machine body on which an engine is mounted, a link mechanism that mounts a work machine on the traveling machine body, and a lifting mechanism that moves up and down the link mechanism.
  • a traveling machine body on which an engine is mounted
  • a link mechanism that mounts a work machine on the traveling machine body
  • a lifting mechanism that moves up and down the link mechanism.
  • a part of the link mechanism is configured by left and right lower links
  • a part of the lifting mechanism is configured by a lift cylinder
  • a work machine is mounted on the traveling machine body so as to be movable up and down.
  • a hitch body that is connected to the transmission case on the base end side of the left and right lower links via a lower link fulcrum shaft, and is detachably fixed to the outer side surface or the outer bottom surface of the transmission case.
  • Left and right lower link fulcrum shafts are provided on the left and right side portions of the hitch body, and the left and right lower link shaft bodies are provided on the left and right side portions of the hitch body via the left and right lower link fulcrum shaft bodies. Since it is configured to support the base end side of the link, it is possible to easily configure different models by changing the specifications of the engine or lower link, etc. Workability can be improved.
  • the hitch body and the left and right lower link fulcrum shaft bodies can be configured in a unit structure, the hitch structure for attaching the left and right lower links can be simplified, and a supporting load adapted to a large working machine can be easily secured. .
  • the hitch body has left and right side plate bodies that are fastened to the outside of the side surface portion of the mission case, and a bottom plate body that is fastened to the outside of the bottom surface portion of the mission case.
  • the lower end sides of the left and right side plates are integrally fixed to the left and right ends of the transmission case, and the side and bottom portions of the mission case are surrounded by the hitch body. While being able to easily prevent the rear axle case and the hitch body from being arranged on each other, it is possible to easily secure a supporting load adapted to a large working machine.
  • a part of the lifting mechanism is configured by left and right lift arms, and the left and right lift arm base ends are connected to the transmission case via a lift fulcrum shaft,
  • the lift cylinders are connected to each other, so that left and right lift arms can be arranged on the upper surface side of the mission case, and lift cylinders can be arranged on the rear side of the mission case.
  • the lifting mechanism can be assembled in a compact manner by utilizing the lower surface effectively. Such as assembling decomposition workability can be improved.
  • the lower link is extended outwardly of the cylinder mounting shaft body, and the lower link fulcrum shaft body or the cylinder mounting shaft body is moved from the left and right outer sides of the transmission case. Since the hitch body is configured to be detachable, the lower link fulcrum shaft body or the cylinder mounting shaft body can be easily attached / detached from the outside of the left and right machines of the traveling machine body, and the assembly of the lower link or the lift cylinder, etc. The outer side of the mounting portion of the cylinder mounting shaft body can be shielded by the lower link while improving workability. That is, the lower link detachment operation or the lift arm and lift cylinder piston detachment operation is executed in preference to the lift cylinder detachment operation. The shaft body can be extracted so that the lift cylinder cannot be removed, and the disassembling workability of the link mechanism and the like can be improved.
  • FIG. 1 It is the perspective view which looked at the raising / lowering mechanism from diagonally left front. It is the perspective view which looked at the hitch mechanism from diagonally left front. It is a top view of a traveling machine body rear part. It is a top view of a raising / lowering mechanism. It is the perspective view which looked at the rear part of the traveling machine body from diagonally left rear. It is a rear view of a traveling machine body rear part. It is a bottom perspective view of a traveling machine body rear part. It is a bottom view of a traveling machine body rear part. It is a left view of a traveling machine body rear part. It is an enlarged view of FIG. It is a front view of a tractor. It is a rear view of a tractor. It is a bottom view of a tractor.
  • FIGS. 1 to 10 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.
  • a diesel engine 5 (hereinafter simply referred to as an engine) is mounted on the front part of the traveling machine body 2 and the rear wheel 4 or the front wheel 3 is driven by the engine 5 so that the tractor 1 travels forward and backward. Yes.
  • 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.
  • 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.
  • a PTO shaft 25 for transmitting a PTO driving force to a working machine such as a rotary tiller is provided to project rearward.
  • the flywheel 26 is attached directly to the output shaft (piston rod) of the engine 5 protruding rearward from the rear side 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 a hydraulic continuously variable transmission, a forward / reverse switching mechanism, a traveling auxiliary transmission gear mechanism, a differential gear mechanism for rear wheels, and the like 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.
  • the transmission power is configured to be 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.
  • 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.
  • 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.
  • a forward / reverse switching lever 36 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.
  • 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.
  • 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. 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) for reducing the speed
  • a sub-shift lever 45 for switching the output range of the traveling sub-speed gear mechanism in the transmission case 17, and a PTO speed change for switching the driving speed of the PTO shaft 25.
  • a lever 46 is 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.
  • 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 ground working machine such as a rotary tiller.
  • Working part position dial 51 (elevating dial).
  • 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 valves (sub-control valves, not shown) arranged on the upper surface side of the mission case 17 are arranged.
  • the hydraulic external take-off valve is for controlling supply of hydraulic oil to hydraulic equipment of another work machine such as a front loader that is retrofitted to the tractor 1.
  • four hydraulic operation levers 54 are arranged in accordance with the number of hydraulic external take-out valves (four stations).
  • 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. Further, as shown in FIGS. 11, 15, etc., a rear support 97 is disposed on the upper surface side of the rear axle case 19 so that the end face of the cross section sandwiches the rear axle case 19 having a substantially rectangular tube shape.
  • An anti-rest bracket 101 is arranged on the lower surface side, and the rear support base 97 and the anti-rest bracket 101 are fastened with bolts 102, and can be adjusted to extend and contract between the middle portion of the lower link 23 extending in the front-rear direction and the anti-rest bracket 101. Both ends of the steady stop rod body 103 with a turnbuckle are connected to prevent the lower link 23 from shaking in the left-right direction.
  • the diesel engine 5 has a cylinder head mounted on a cylinder block containing an engine output shaft and a 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).
  • An intake manifold 203 and an EGR device 210 that recirculates a part of the exhaust gas from the exhaust manifold 204 are arranged, and a part of the exhaust gas discharged to the exhaust manifold 204 is returned to the intake manifold 203 to increase the amount of exhaust gas.
  • 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, in the engine 5, 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, and the cooling fan 206 is arranged on the front side of the diesel engine 5 (cylinder block).
  • the diesel engine 5 includes a continuously regenerative exhaust gas purification device 224 (DPF) disposed on the upper surface side of the diesel engine 5 (above the exhaust manifold 204).
  • the tail pipe 229 is connected to the exhaust side of the exhaust gas 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.
  • the bonnet 6 has a front grille 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.
  • 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.
  • a rectangular frame-like frame 226 is provided on the front side of the radiator 235, and an air cleaner 221 is disposed above the front surface of the frame frame 226.
  • an oil cooler, a fuel cooler, and the like are installed in the frame frame 226.
  • 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 16 and is installed on the front end portions (rear side of the engine 5) of the left and right airframe frames 16 via the engine legs having vibration-proof rubber.
  • the rear part of the diesel engine 5 is connected to the upper surface of the support beam frame 236.
  • the left and right side surfaces of the front part of the diesel engine 5 are connected to the middle part of the pair of left and right engine frames 14 via left and right front engine legs 238 having anti-vibration rubber.
  • the front side of the diesel engine 5 is supported on the engine frame 14 by vibration isolation, and the rear portion of the diesel engine 5 is supported on the front end side of the pair of left and right body frames 16 via the support beam frame 236.
  • a bonnet shield plate (shield plate) 244 is erected on the upper surface of the support beam frame 236 via a pair of left and right support frames.
  • the back of the hood 6 is covered with a hood shield plate 244.
  • the engine room 200 in which the diesel engine 5 is housed is formed in a space surrounded by the hood 6, the left and right side engine covers 232, the fan shroud 234, and the hood shield plate 244.
  • the heat insulation layer is formed between the cabin 7 arrange
  • a pair of left and right beam frames 248 are installed between the upper part of the fan shroud 234 and the upper part of the bonnet shield plate 244.
  • the upper part of the fan shroud 234 and the upper part of the bonnet shield plate 244 are connected by a pair of beam frames 248, and these members are integrated to form a robust frame structure of the engine room 200 as a whole.
  • the left and right edges of the heat shield plate 250 are fixed to the beam frame 248, and the exhaust gas purifying device 224 on the upper side of the diesel engine 5 is covered with the heat shield plate 250.
  • the heat shield plate 250 By disposing the heat shield plate 250 on the exhaust gas purification device 224, it is possible to prevent the bonnet 6 from being heated by the exhaust heat of the exhaust gas purification device 224 and the diesel engine 5, and to prevent the hood 6 and the heat shield plate 250 from being heated.
  • a space is formed in between so that the inside of the engine room 200 below the heat shield plate 250 is insulated from the outside air so that the exhaust gas purification device 224 can be operated in a high temperature environment.
  • a bonnet support bracket 255 is provided on the upper front edge of the bonnet shield plate 244, the rear end of the bonnet 6 is rotatably supported, and the front part of the bonnet 6 is moved up and down with the hinge portion of the bonnet support bracket 255 as a fulcrum. It is configured as follows.
  • expandable and contractible gas springs 256 are disposed on the left and right sides of the heat shield plate 250 below the bonnet 6.
  • One end (rear end) of a pair of left and right gas springs 256 is pivotally attached to the rear end side of the pair of left and right beam frames 248, and the other end (front end) of the gas spring 256 is pivotally attached to the upper inner surface of the bonnet 6. .
  • the front part of the bonnet 6 is moved upward with the hinge part of the bonnet support bracket 255 as an axis fulcrum, and the upper surface side of the front part of the engine room 200 is opened. Maintenance work can be performed.
  • 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 end portions 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.
  • 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 lifting mechanism 22 includes left and right hydraulic lift cylinders 117 that are controlled by operation of the one-touch lifting lever 34 or the working unit position dial 51, and an upper surface that can be opened and closed provided on the upper side of the rear transmission case 113 of the transmission case 17.
  • the lid 118 has left and right lift arms 120 that pivotally support the base end side through a lift fulcrum shaft 119 and left and right lift rods 121 that connect the left and right lift arms 120 to the left and right lower links 23. is doing.
  • 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.
  • a 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 124.
  • 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.
  • a hitch body 131 detachably fixed to the outer side surface or the outer bottom surface of the mission case 17 is provided.
  • Left and right lower link fulcrum shafts 130 are provided on the left and right side portions of the hitch body 131, and the base ends of the left and right lower links 23 are rotated on the left and right side portions of the hitch body 131 via the left and right lower link fulcrum shaft bodies 130. Supports movable.
  • the hitch body 131 includes left and right side plates 132 that are fastened with bolts 134 to the outside of the side surface of the rear transmission case 113 (transmission case 17), and a bottom plate that is fastened with bolts 135 to the outside of the bottom surface of the rear transmission case 113 (mission case 17). 133.
  • the bottom plate 133 is integrally fixed to the left and right ends of the left and right side plates 132 so that the side and bottom portions of the rear transmission case 113 (mission case 17) are surrounded by the hitch body 131. ing.
  • a fulcrum shaft boss 136 and a fulcrum bearing bracket 137 are fixed to the outer surface of the side plate 132, and one end side of the lower link fulcrum shaft 130 is fitted into the fulcrum shaft boss 136, and the other end of the lower link fulcrum shaft 130 is inserted.
  • a shaft stopper plate 138 is fixed to the side, and one end side of the lower link fulcrum shaft body 130 is passed through the fulcrum bearing bracket 137 from the outside of the machine, and the lower link fulcrum is supported by the lower link 23 base end and the fulcrum shaft boss 136.
  • the lower link fulcrum shaft body 130 is attached to and detached from the hitch body 131 from the left and right outer sides of the mission case 17 so that the lower link 23 can be attached and detached.
  • the lower link fulcrum shaft body 130 has a lower link 23 base end portion that is freely foldable.
  • a lift arm 120 base end is pivotally supported on the lift fulcrum shaft 119, a lift rod 121 (horizontal cylinder 122) is connected to the lift arm 120 distal end side, and a single acting structure is provided between the lift arm 120 and a piston receiving shaft 141.
  • the front end side (upper end side) of the piston 142 of the lift cylinder 117 is connected.
  • the cylinder shaft boss 145 and the cylinder receiving body 146 are fixed to the outer side surface of the side plate body 132, and one end side of the cylinder mounting shaft body 147 is fitted into the cylinder shaft boss 145, and the other end of the cylinder mounting shaft body 147 is inserted.
  • a shaft stopper plate 148 is fixed to the side, and one end side of the cylinder mounting shaft body 147 is passed through the cylinder receiving body 146 from the outside of the machine, and the base end portion (lower end side) of the lift cylinder 117 and the cylinder shaft boss 145 One end side of the cylinder mounting shaft body 147 is fitted to the cylinder mounting body 146, and a shaft stopper plate 148 is fastened to the machine outer surface of the cylinder receiving body 146 with a bolt 149.
  • the lower link 23 is extended to the outer side of the cylinder mounting shaft body 147, and the outer side of the mounting portion of the cylinder mounting shaft body 147 is shielded by the lower link 23, and the lower link 23 is removed.
  • the cylinder mounting shaft body 147 is attached to and detached from the hitch body 131 from the left and right outer sides of the transmission case 17 so that the lift cylinder 117 can be attached and detached.
  • the cylinder mounting shaft body 147 is extracted and the lift cylinder 117 cannot be removed. .
  • a pulling arm 151 for pulling a cart (not shown) is provided.
  • a pulling pin 152 for connecting the carriage is provided at the rear end portion of the pulling arm 151, and a vertical restriction plate 153 is fixed to the rear end portion of the side plate body 132, and a left and right restriction pin 154 is provided on the vertical restriction plate 153.
  • An intermediate portion of the pull arm 151 is passed between the plate 153 and the left and right restricting pins 154.
  • a traction bracket 155 is fixed to the lower surface of the bottom plate body 133, and the front end side of the traction arm 151 is connected to the traction bracket 155 via a locking shaft body 156 so that the front and rear positions can be adjusted.
  • a traveling machine body 2 on which a diesel engine 5 is mounted, a link mechanism 111 for mounting a work machine on the traveling machine body 2, and a lifting mechanism 22 for moving the link mechanism 111 up and down are provided.
  • a part of the traveling machine body 2 is constituted by the mission case 17, a part of the link mechanism 111 is constituted by the left and right lower links 23, and a part of the elevating mechanism 22 is constituted by the lift cylinder 117.
  • the base end side of the left and right lower links 23 is connected to the transmission case 17 via the lower link fulcrum shaft 130,
  • a hitch body 131 that is detachably fixed to the outside of the unit, and left and right lower link fulcrum shaft bodies 130 are provided on the left and right side portions of the hitch body 131, It is configured to support the base end side of the right and left lower link 23 via the left and right lower link fulcrum shaft 130 on the left and right side portions 31. Therefore, by sharing the traveling machine body 2 and changing the specifications of the engine 5 or the lower link 23, different models can be easily configured, and workability such as design and production can be improved.
  • the hitch body 131 and the left and right lower link fulcrum shaft bodies 130 can be configured in a unit structure, the hitch structure for attaching the left and right lower links 23 can be simplified, and a support load suitable for a large working machine can be easily obtained. It can be secured.
  • the hitch body 131 has left and right side plate bodies 132 fastened to the outside of the side surface portion of the mission case 17, and a bottom plate body 133 fastened to the outside of the bottom surface portion of the mission case 17.
  • the lower end sides of the left and right side plate bodies 132 are integrally fixed to the left and right end portions of the body 133, and the side and bottom portions of the mission case 17 are surrounded by the hitch body 131. Accordingly, it is possible to easily prevent the rear axle case 19 disposed on the left and right side surfaces of the mission case 17 and the hitch body 131, and to easily secure a supporting load adapted to a large working machine.
  • a part of the lifting mechanism 22 is constituted by the left and right lift arms 120, and the base ends of the left and right lift arms 120 are connected to the transmission case 17 via the lift fulcrum shaft 119.
  • the middle of the left and right lower links 23 is connected to the tip of the lift arm 120 via a lift rod 121, and the lift cylinder 117 is attached to the middle of the left and right lift arms 120, and the cylinder receiver 146 of the hitch body 131 is connected to the cylinder.
  • a lift cylinder 117 is connected via an attachment shaft body 147.
  • the left and right lift arms 120 can be disposed on the upper surface side of the mission case 17, the lift cylinder 117 can be disposed on the rear surface side of the mission case 17, and the left and right side surfaces and the upper and lower surfaces of the rear portion of the mission case 17 can be effectively utilized to move up and down. While the mechanism 22 can be assembled compactly, the assembly / disassembly workability of the elevating mechanism 22 can be improved.
  • the lower link 23 is extended to the outside of the cylinder mounting shaft 147, and the lower link fulcrum shaft 130 or the cylinder mounting shaft 147 is hitch from the left and right outer sides of the transmission case 17.
  • the body 131 is detachable. Accordingly, the lower link fulcrum shaft body 130 or the cylinder mounting shaft body 147 can be easily attached / detached from the outer sides of the left and right machines of the traveling machine body 2, and the assembly / disassembly workability of the lower link 23 or the lift cylinder 117 can be improved.
  • the outer side of the mounting portion of the cylinder mounting shaft body 147 can be shielded by the lower link 23.
  • the cylinder is The mounting shaft body 147 can be extracted so that the lift cylinder 117 cannot be removed, and the disassembly workability of the link mechanism 111 and the like can be improved.

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  • Engineering & Computer Science (AREA)
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  • Lifting Devices For Agricultural Implements (AREA)

Abstract

The problem addressed by the present invention is to provide a tractor that can easily constitute different models and improve workability for design, fabrication, and the like. A tractor to which a working implement is raisably and lowerably attached to a moving machine body (2) is provided with the moving machine body (2) in which an engine (5) is mounted, a link mechanism (111) for attaching a work implement to the moving machine body (2), and a raising and lowering mechanism (22) for raising and lowering the link mechanism (111), with part of the moving machine body (2) being constituted of a transmission case (17), part of the link mechanism (111) constituted of lower links (23), and part of the raising and lowering mechanism (22) constituted of a lift cylinder (117). The structure is such that the base end sides of the left and right lower links (23) are linked to the transmission case (17) via lower link support shaft bodies (130), and a hitch body (131) is provided attachably and detachably on the outside of the side surface part or the outside of the bottom surface part of the transmission case (17). The left and right lower link support shaft bodies (130) are provided on the left and right side parts of the hitch body (131), and the constitution is such that the base end sides of the left and right lower links (23) are supported via the left and right lower link support shaft bodies (130) on the left and right side parts of the hitch body (131).

Description

トラクタTractor
　本願発明は、耕耘作業機または播種作業機などの対地作業機を牽引する農作業用のトラクタに関するものである。 The present invention relates to a tractor for farm work that pulls a ground work machine such as a tillage work machine or a sowing work machine.
　従来、トラクタの後部に配置するリンク機構と、該リンク機構を昇降動させるリフトアーム及びリフトシリンダを設け、トラクタの後部にリンク機構を介してロータリ耕耘作業機を昇降自在に装設させ、圃場を耕耘する技術がある。（特許文献１参照） Conventionally, a link mechanism disposed at the rear of the tractor, a lift arm and a lift cylinder for moving the link mechanism up and down, and a rotary tiller working machine mounted on the rear of the tractor via the link mechanism so as to be movable up and down are provided. There is technology to cultivate. (See Patent Document 1)
特開２００８－１８７９８２号JP 2008-187982 A
　従来技術は、トラクタ機体を構成するミッションケースに、ロワーリンク支点軸体を貫通させ、ロワーリンク支点軸体の両端に左右のロワーリンク基端を支持しているから、特定のトラクタ機体に特定のロワーリンクが取付けられることになり、トラクタ機体を共用して、エンジンまたはロワーリンクなどの仕様を変更して、異なる機種を構成することができないなどの設計製作上の問題がある。また、例えば、ロワーリンク支点軸体を左右に分割して形成し、左右のロワーリンク支点軸体を介してミッションケースに左右のロワーリンク基端を支持させることも可能であるが、ミッションケースに左右のロワーリンク支点軸体をそれぞれ固着する必要があり、左右のロワーリンク取付け構造を簡略化できないと共に、大型の作業機に適応した支持荷重を確保しにくいなどの構造上の問題がある。 In the prior art, the lower link fulcrum shaft is passed through the mission case constituting the tractor airframe, and the left and right lower link base ends are supported at both ends of the lower link fulcrum shaft. A lower link will be attached, and there is a problem in designing and manufacturing such that it is not possible to configure different models by changing the specifications of the engine or the lower link by sharing the tractor body. For example, the lower link fulcrum shaft can be divided into left and right parts, and the left and right lower link base ends can be supported by the transmission case via the left and right lower link fulcrum shafts. The left and right lower link fulcrum shafts need to be fixed respectively, and there are structural problems such that the left and right lower link mounting structures cannot be simplified and it is difficult to secure a support load adapted to a large working machine.
　本願発明は、上記のような現状を検討して改善を施したトラクタを提供することを技術的課題としている。 The present invention has a technical problem to provide an improved tractor by examining the current situation as described above.
　請求項１に係る発明は、エンジンを搭載する走行機体と、前記走行機体に作業機を装着するリンク機構と、前記リンク機構を昇降動する昇降機構を備え、前記走行機体の一部をミッションケースにて構成し、前記リンク機構の一部を左右のロワーリンクにて構成し、前記昇降機構の一部をリフトシリンダにて構成し、前記走行機体に作業機を昇降可能に取付けるトラクタにおいて、前記ミッションケースにロワーリンク支点軸体を介して前記左右のロワーリンクの基端側を連結する構造であって、前記ミッションケースの側面部外側または底面部外側に着脱可能に固着するヒッチ体を備え、該ヒッチ体の左右側部に左右のロワーリンク支点軸体を設け、前記ヒッチ体の左右側部に左右のロワーリンク支点軸体を介して前記左右のロワーリンクの基端側を支持するように構成したものである。 The invention according to claim 1 includes a traveling machine body on which an engine is mounted, a link mechanism that mounts a work machine on the traveling machine body, and a lifting mechanism that moves the link mechanism up and down. A part of the traveling machine body is a transmission case. A part of the link mechanism is composed of left and right lower links, a part of the elevating mechanism is composed of a lift cylinder, and the tractor is attached to the traveling machine body so that the work machine can be raised and lowered, It is a structure that connects the base end side of the left and right lower links to the transmission case via a lower link fulcrum shaft, and includes a hitch body that is detachably fixed to the outer side surface or the outer bottom surface of the transmission case, Left and right lower link fulcrum shafts are provided on the left and right side portions of the hitch body, and the left and right lower link shafts are provided on the left and right side portions of the hitch body via left and right lower link fulcrum shaft bodies. It is obtained by constituting the base end side so as to support.
　請求項２の発明は、請求項１に記載のトラクタにおいて、前記ヒッチ体は、前記ミッションケースの側面部外側に締結する左右の側板体と、前記ミッションケースの底面部外側に締結する底板体を有し、前記底板体の左右端部に左右の側板体の下端側を一体的に固着し、前記ミッションケースの側面部と底面部を前記ヒッチ体にて囲むように構成したものである。 According to a second aspect of the present invention, in the tractor according to the first aspect, the hitch body includes left and right side plate bodies that are fastened to the outside of the side surface portion of the mission case, and a bottom plate body that is fastened to the outside of the bottom surface portion of the mission case. And the lower end of the left and right side plates are integrally fixed to the left and right ends of the bottom plate, and the side and bottom portions of the transmission case are surrounded by the hitch body.
　請求項３の発明は、請求項１に記載のトラクタにおいて、前記昇降機構の一部を左右のリフトアームにて構成し、前記ミッションケースにリフト支点軸を介して左右のリフトアーム基端側を連結し、前記左右のリフトアーム先端側にリフトロッドを介して前記左右のロワーリンク中間を連結し、前記左右のリフトアーム中間に前記リフトシリンダを取付ける構造であって、前記ヒッチ体のシリンダ受け体にシリンダ取付け軸体を介して前記リフトシリンダを連結したものである。 According to a third aspect of the present invention, in the tractor according to the first aspect, a part of the elevating mechanism is configured by left and right lift arms, and the left and right lift arm proximal end sides are connected to the transmission case via a lift fulcrum shaft. A structure in which the left and right lower link middles are coupled to the front ends of the left and right lift arms via lift rods, and the lift cylinder is attached to the middle of the left and right lift arms. The lift cylinder is connected to a cylinder through a cylinder mounting shaft.
　請求項４の発明は、請求項３に記載のトラクタにおいて、前記シリンダ取付け軸体の外側方に前記ロワーリンクを延設させると共に、前記ロワーリンク支点軸体またはシリンダ取付け軸体を、前記ミッションケースの左右外側方向から前記ヒッチ体に着脱可能に構成したものである。 According to a fourth aspect of the present invention, in the tractor according to the third aspect, the lower link is extended outward of the cylinder mounting shaft body, and the lower link fulcrum shaft body or the cylinder mounting shaft body is connected to the transmission case. It is comprised so that attachment or detachment to the said hitch body is possible from the left-right outer direction.
　請求項１に係る発明によれば、エンジンを搭載する走行機体と、前記走行機体に作業機を装着するリンク機構と、前記リンク機構を昇降動する昇降機構を備え、前記走行機体の一部をミッションケースにて構成し、前記リンク機構の一部を左右のロワーリンクにて構成し、前記昇降機構の一部をリフトシリンダにて構成し、前記走行機体に作業機を昇降可能に取付けるトラクタにおいて、前記ミッションケースにロワーリンク支点軸体を介して前記左右のロワーリンクの基端側を連結する構造であって、前記ミッションケースの側面部外側または底面部外側に着脱可能に固着するヒッチ体を備え、該ヒッチ体の左右側部に左右のロワーリンク支点軸体を設け、前記ヒッチ体の左右側部に左右のロワーリンク支点軸体を介して前記左右のロワーリンクの基端側を支持するように構成したものであるから、前記走行機体を共用して、エンジンまたはロワーリンクなどの仕様を変更することにより、異なる機種を容易に構成でき、設計製作などの作業性を向上できる。また、前記ヒッチ体と左右のロワーリンク支点軸体をユニット構造に構成でき、左右のロワーリンクを取付けるためのヒッチ構造を簡略化できると共に、大型の作業機に適応した支持荷重を簡単に確保できる。 According to the first aspect of the present invention, the vehicle includes a traveling machine body on which an engine is mounted, a link mechanism that mounts a work machine on the traveling machine body, and a lifting mechanism that moves up and down the link mechanism. In a tractor configured by a transmission case, a part of the link mechanism is configured by left and right lower links, a part of the lifting mechanism is configured by a lift cylinder, and a work machine is mounted on the traveling machine body so as to be movable up and down. A hitch body that is connected to the transmission case on the base end side of the left and right lower links via a lower link fulcrum shaft, and is detachably fixed to the outer side surface or the outer bottom surface of the transmission case. Left and right lower link fulcrum shafts are provided on the left and right side portions of the hitch body, and the left and right lower link shaft bodies are provided on the left and right side portions of the hitch body via the left and right lower link fulcrum shaft bodies. Since it is configured to support the base end side of the link, it is possible to easily configure different models by changing the specifications of the engine or lower link, etc. Workability can be improved. In addition, the hitch body and the left and right lower link fulcrum shaft bodies can be configured in a unit structure, the hitch structure for attaching the left and right lower links can be simplified, and a supporting load adapted to a large working machine can be easily secured. .
　請求項２に係る発明によれば、前記ヒッチ体は、前記ミッションケースの側面部外側に締結する左右の側板体と、前記ミッションケースの底面部外側に締結する底板体を有し、前記底板体の左右端部に左右の側板体の下端側を一体的に固着し、前記ミッションケースの側面部と底面部を前記ヒッチ体にて囲むように構成したものであるから、前記ミッションケースの左右側面に配置させる後車軸ケースと前記ヒッチ体の干渉を容易に防止できるものでありながら、大型の作業機に適応した支持荷重を簡単に確保できる。 According to the invention of claim 2, the hitch body has left and right side plate bodies that are fastened to the outside of the side surface portion of the mission case, and a bottom plate body that is fastened to the outside of the bottom surface portion of the mission case. The lower end sides of the left and right side plates are integrally fixed to the left and right ends of the transmission case, and the side and bottom portions of the mission case are surrounded by the hitch body. While being able to easily prevent the rear axle case and the hitch body from being arranged on each other, it is possible to easily secure a supporting load adapted to a large working machine.
　請求項３に係る発明によれば、前記昇降機構の一部を左右のリフトアームにて構成し、前記ミッションケースにリフト支点軸を介して左右のリフトアーム基端側を連結し、前記左右のリフトアーム先端側にリフトロッドを介して前記左右のロワーリンク中間を連結し、前記左右のリフトアーム中間に前記リフトシリンダを取付ける構造であって、前記ヒッチ体のシリンダ受け体にシリンダ取付け軸体を介して前記リフトシリンダを連結したものであるから、前記ミッションケースの上面側に左右のリフトアームを配置でき、前記ミッションケースの背面側にリフトシリンダを配置でき、前記ミッションケース後部の左右側面及び上下面を有効に活用して、前記昇降機構をコンパクトに組付けることができるものでありながら、前記昇降機構の組付け分解作業性などを向上できる。 According to a third aspect of the present invention, a part of the lifting mechanism is configured by left and right lift arms, and the left and right lift arm base ends are connected to the transmission case via a lift fulcrum shaft, A structure in which the middle of the left and right lower links is connected to the tip end side of the lift arm via a lift rod, and the lift cylinder is attached to the middle of the left and right lift arms, and a cylinder mounting shaft body is mounted on the cylinder receiver of the hitch body. The lift cylinders are connected to each other, so that left and right lift arms can be arranged on the upper surface side of the mission case, and lift cylinders can be arranged on the rear side of the mission case. The lifting mechanism can be assembled in a compact manner by utilizing the lower surface effectively. Such as assembling decomposition workability can be improved.
　請求項４に係る発明によれば、前記シリンダ取付け軸体の外側方に前記ロワーリンクを延設させると共に、前記ロワーリンク支点軸体またはシリンダ取付け軸体を、前記ミッションケースの左右外側方向から前記ヒッチ体に着脱可能に構成したものであるから、前記走行機体の左右機外側方から前記ロワーリンク支点軸体またはシリンダ取付け軸体を容易に着脱操作でき、前記ロワーリンクまたは前記リフトシリンダなどの組付け分解作業性を向上できるものでありながら、前記シリンダ取付け軸体の取付け部の外側方を前記ロワーリンクにて遮蔽できる。即ち、前記ロワーリンクの離脱操作、またはリフトアームと前記リフトシリンダのピストンの離脱操作が、前記リフトシリンダの離脱操作に優先して実行されるから、前記ロワーリンクを取付けた状態では、前記シリンダ取付け軸体を抜き出して、前記リフトシリンダを外せないように構成でき、リンク機構などの分解作業性を向上できる。 According to the invention of claim 4, the lower link is extended outwardly of the cylinder mounting shaft body, and the lower link fulcrum shaft body or the cylinder mounting shaft body is moved from the left and right outer sides of the transmission case. Since the hitch body is configured to be detachable, the lower link fulcrum shaft body or the cylinder mounting shaft body can be easily attached / detached from the outside of the left and right machines of the traveling machine body, and the assembly of the lower link or the lift cylinder, etc. The outer side of the mounting portion of the cylinder mounting shaft body can be shielded by the lower link while improving workability. That is, the lower link detachment operation or the lift arm and lift cylinder piston detachment operation is executed in preference to the lift cylinder detachment operation. The shaft body can be extracted so that the lift cylinder cannot be removed, and the disassembling workability of the link mechanism and the like can be improved.
トラクタの左側面図である。It is a left view of a tractor. トラクタの平面図である。It is a top view of a tractor. トラクタの右側面図である。It is a right view of a tractor. トラクタを右斜め後方から見た斜視図である。It is the perspective view which looked at the tractor from diagonally right back. 走行機体の左側面説明図である。It is left side explanatory drawing of a traveling body. 走行機体の詳細構造を示す左側面説明図である。It is left side explanatory drawing which shows the detailed structure of a traveling body. 走行機体を左斜め後方から見た斜視図である。It is the perspective view which looked at the traveling body from diagonally left rear. 走行機体の右側面説明図である。It is right side explanatory drawing of a traveling body. 走行機体の詳細構造を示す右側面説明図である。It is right side explanatory drawing which shows the detailed structure of a traveling body. 走行機体を右斜め後方から見た斜視図である。It is the perspective view which looked at the traveling machine body from diagonally right rear. 走行機体の後部を左斜め前方から見た斜視図である。It is the perspective view which looked at the rear part of the traveling machine body from diagonally left forward. 昇降機構を左斜め前方から見た斜視図である。It is the perspective view which looked at the raising / lowering mechanism from diagonally left front. ヒッチ機構を左斜め前方から見た斜視図である。It is the perspective view which looked at the hitch mechanism from diagonally left front. 走行機体後部の平面図である。It is a top view of a traveling machine body rear part. 昇降機構の平面図である。It is a top view of a raising / lowering mechanism. 走行機体の後部を左斜め後方から見た斜視図である。It is the perspective view which looked at the rear part of the traveling machine body from diagonally left rear. 走行機体後部の背面図である。It is a rear view of a traveling machine body rear part. 走行機体後部の底面斜視図である。It is a bottom perspective view of a traveling machine body rear part. 走行機体後部の底面図である。It is a bottom view of a traveling machine body rear part. 走行機体後部の左側面図である。It is a left view of a traveling machine body rear part. 図２０の拡大図である。It is an enlarged view of FIG. トラクタの正面図である。It is a front view of a tractor. トラクタの背面図である。It is a rear view of a tractor. トラクタの底面図である。It is a bottom view of a tractor.
　以下に、本願発明を具体化した実施形態について、農作業用トラクタを図面に基づき説明する。図１～図１０に示す如く、トラクタ１の走行機体２は、走行部としての左右一対の前車輪３と同じく左右一対の後車輪４とで支持されている。走行機体２の前部にディーゼルエンジン５（以下、単にエンジンという）を搭載し、後車輪４または前車輪３をエンジン５にて駆動することによって、トラクタ１が前後進走行するように構成されている。エンジン５はボンネット６にて覆われている。走行機体２の上面にはキャビン７が設置される。該キャビン７の内部には、操縦座席８と、前車輪３を操向操作する操縦ハンドル９とが配置されている。キャビン７の左右外側には、オペレータが乗降するステップ１０が設けられている。エンジン５に燃料を供給する燃料タンク１１がキャビン７底部の下側に設けられている。 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 10, 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. A diesel engine 5 (hereinafter simply referred to as an engine) is mounted on the front part of the traveling machine body 2 and the rear wheel 4 or the front wheel 3 is driven by the engine 5 so that the tractor 1 travels forward and backward. Yes. 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.
　走行機体２は、前バンパー１２及び前車軸ケース１３を有するエンジンフレーム１４と、エンジンフレーム１４の後部に着脱自在に固定した左右の機体フレーム１５とにより構成されている。前車軸ケース１３の左右両端側から外向きに、前車軸１６を回転可能に突出させている。前車軸ケース１３の左右両端側に前車軸１６を介して前車輪３を取り付けている。機体フレーム１５の後部には、エンジン５からの回転動力を適宜変速して前後四輪３，３，４，４に伝達するためのミッションケース１７を連結している。左右の機体フレーム１５及びミッションケース１７の下面側には、左右外向きに張り出した底面視矩形枠板状のタンクフレーム１８をボルト締結している。実施形態の燃料タンク１１は左右２つに分かれている。タンクフレーム１８の左右張り出し部の上面側に、左右の燃料タンク１１を振り分けて搭載している。ミッションケース１７の左右外側面には、左右の後車軸ケース１９を外向きに突出するように装着している。左右の後車軸ケース１９には左右の後車軸２０を回転可能に内挿している。ミッションケース１７に後車軸２０を介して後車輪４を取り付けている。左右の後車輪４の上方は左右のリヤフェンダー２１によって覆われている。 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.
　ミッションケース１７の後部には、例えばロータリ耕耘機などの対地作業機（図示省略）を昇降動させる油圧式昇降機構２２を着脱可能に取付けている。前記対地作業機は、左右一対のロワーリンク２３及びトップリンク２４からなる３点リンク機構１１１を介してミッションケース１７の後部に連結される。ミッションケース１７の後側面には、ロータリ耕耘機等の作業機にＰＴＯ駆動力を伝達するためのＰＴＯ軸２５を後ろ向きに突設している。 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 transmitting a PTO driving force to a working machine such as a rotary tiller is provided to project rearward.
　エンジン５の後側面から後ろ向きに突設するエンジン５の出力軸（ピストンロッド）には、フライホイル２６を直結するように取付けている。両端に自在軸継手を有する動力伝達軸２９を介して、フライホイル２６から後ろ向きに突出した主動軸２７と、ミッションケース１７前面側から前向きに突出した主変速入力軸２８とを連結している（図１、図７及び図１０参照）。ミッションケース１７内には、油圧無段変速機、前後進切換機構、走行副変速ギヤ機構及び後輪用差動ギヤ機構などを配置している。エンジン５の回転動力は、主動軸２７及び動力伝達軸２９を経由してミッションケース１７の主変速入力軸２８に伝達され、前記油圧無段変速機及び走行副変速ギヤ機構によって適宜変速され、当該変速動力が前記後輪用差動ギヤ機構を介して左右の後車輪４に伝達されるように構成している。 The flywheel 26 is attached directly to the output shaft (piston rod) of the engine 5 protruding rearward from the rear side 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, a differential gear mechanism for rear wheels, and the like 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. The transmission power is configured to be transmitted to the left and right rear wheels 4 through the rear wheel differential gear mechanism.
　ミッションケース１７の前面下部から前向きに突出した前車輪出力軸３０には、前車輪駆動軸３１を介して、前輪用差動ギヤ機構（図示省略）を内蔵する前車軸ケース１３から後向きに突出した前車輪伝達軸（図示省略）を連結している。ミッションケース１７内の油圧無段変速機及び走行副変速ギヤ機構による変速動力は、前車輪出力軸３０、前車輪駆動軸３１及び前車輪伝達軸から前車軸ケース１３内の前輪用差動ギヤ機構を経由して、左右の前車輪３に伝達される。 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.
　次に、図１～図４を参照しながら、キャビン７内部の構造について説明する。キャビン７内における操縦座席８の前方にステアリングコラム３２を配置している。ステアリングコラム３２は、キャビン７内部の前面側に配置したダッシュボード３３の背面側に埋設するような状態で立設している。ステアリングコラム３２上面から上向きに突出したハンドル軸の上端側に、平面視略丸型の操縦ハンドル９を取り付けている。 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.
　ステアリングコラム３２の右側には、ロータリ耕耘機等の作業機を最上昇位置や最下降位置に強制的に移動させるワンタッチ昇降レバー３４と、走行機体２を制動操作するための左右一対のブレーキペダル３５とを配置している。ステアリングコラム３２の左側には、走行機体２の進行方向を前進と後進とに切り換え操作するための前後進切換レバー３６（リバーサレバー）と、動力継断用のクラッチ（図示省略）を遮断操作するためのクラッチペダル３７とを配置している。 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.
　ステアリングコラム３２の左側で前後進切換レバー３６の下方には、前後進切換レバー３６に沿って延びる誤操作防止体３８（リバーサガード）を配置している。接触防止具である誤操作防止体３８を前後進切換レバー３６下方に配置することによって、トラクタ１に乗降する際に、オペレータが前後進切換レバー３６に不用意に接触するのを防止している。ダッシュボード３３の背面上部側には、液晶パネルを内蔵した操作表示盤３９を設けている。 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.
　キャビン７内にある操縦座席８前方の床板４０においてステアリングコラム３２の右側には、エンジン５の回転速度または車速などを制御するアクセルペダル４１を配置している。なお、床板４０上面の略全体は平坦面に形成している。操縦座席８を挟んで左右両側にはサイドコラム４２を配置している。操縦座席８と左サイドコラム４２との間には、左右両後車輪４を制動状態に維持する操作を実行するための駐車ブレーキレバー４３と、トラクタ１の走行速度（車速）を強制的に大幅に低減させる超低速レバー４４（クリープレバー）と、ミッションケース１７内の走行副変速ギヤ機構の出力範囲を切換えるための副変速レバー４５と、ＰＴＯ軸２５の駆動速度を切換え操作するためのＰＴＯ変速レバー４６とを配置している。操縦座席８の下方には、左右両後車輪４の差動駆動をオンオフするためのデフロックペダル４７を配置している。操縦座席８の後方左側には、ＰＴＯ軸２５を逆転駆動させる操作を実行する逆転ＰＴＯレバー４８を配置している。 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. 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) for reducing the speed, a sub-shift lever 45 for switching the output range of the traveling sub-speed gear mechanism in the transmission case 17, and a PTO speed change for switching the driving speed of the PTO shaft 25. A lever 46 is 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.
　操縦座席８と左サイドコラム４２との間には、操縦座席８に着座したオペレータの腕や肘を載せるためのアームレスト４９を設けている。アームレスト４９は、操縦座席８とは別体に構成すると共に、トラクタ１の走行速度を増減速させる主変速レバー５０と、ロータリ耕耘機といった対地作業機の高さ位置を手動で変更調節するダイヤル式の作業部ポジションダイヤル５１（昇降ダイヤル）とを備えている。なお、アームレスト４９は、後端下部を支点として複数段階に跳ね上げ回動可能な構成になっている。 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 ground working machine such as a rotary tiller. Working part position dial 51 (elevating dial). 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.
　左サイドコラム４２には、前側から順に、エンジン５の回転速度を設定保持するスロットルレバー５２と、ＰＴＯ軸２５からロータリ耕耘機等の作業機への動力伝達を継断操作するＰＴＯクラッチスイッチ５３と、ミッションケース１７の上面側に配置する油圧外部取出バルブ（サブコントロールバルブ、図示省略）を切換操作するための複数の油圧操作レバー５４（ＳＣＶレバー）とを配置している。ここで、油圧外部取出バルブは、トラクタ１に後付けされるフロントローダといった別の作業機の油圧機器に作動油を供給制御するためのものである。実施形態では、油圧外部取出バルブの数（４連）に合わせて、油圧操作レバー５４を４つ配置している。 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 valves (sub-control valves, not shown) arranged on the upper surface side of the mission case 17 are arranged. Here, the hydraulic external take-off valve is for controlling supply of hydraulic oil to hydraulic equipment of another 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).
　さらに、図７、図１０などに示す如く、キャビン７の前側を支持する左右の前部支持台９６と、キャビン７の後部を支持する左右の後部支持台９７を備える。左右の機体フレーム１５の機外側面のうち前後中間部に前部支持台９６をボルト締結させ、前部支持台９６の上面側に防振ゴム体９８を介してキャビン７の前側底部を防振支持すると共に、左右方向に水平に延設させる左右の後車軸ケース１９の上面のうち左右幅中間部に後部支持台９７をボルト締結させ、後部支持台９７の上面側に防振ゴム体９９を介してキャビン７の後側底部を防振支持している。また、図１１、図１５などに示す如く、断面端面が略四角筒状の後車軸ケース１９を挟むように、後車軸ケース１９の上面側に後部支持台９７を配置し、後車軸ケース１９の下面側に振れ止めブラケット１０１を配置し、後部支持台９７と振れ止めブラケット１０１をボルト１０２締結すると共に、前後方向に延設したロワーリンク２３の中間部と振れ止めブラケット１０１とに、伸縮調節可能なターンバックル付き振れ止めロッド体１０３の両端部を連結し、ロワーリンク２３の左右方向の揺振を防止している。 Furthermore, as shown in FIGS. 7 and 10, 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. Further, as shown in FIGS. 11, 15, etc., a rear support 97 is disposed on the upper surface side of the rear axle case 19 so that the end face of the cross section sandwiches the rear axle case 19 having a substantially rectangular tube shape. An anti-rest bracket 101 is arranged on the lower surface side, and the rear support base 97 and the anti-rest bracket 101 are fastened with bolts 102, and can be adjusted to extend and contract between the middle portion of the lower link 23 extending in the front-rear direction and the anti-rest bracket 101. Both ends of the steady stop rod body 103 with a turnbuckle are connected to prevent the lower link 23 from shaking in the left-right direction.
　次に、図６、図９、図１０などを参照して、ボンネット６下のディーゼルエンジン５とエンジンルーム構造について説明する。ディーゼルエンジン５は、エンジン出力軸とピストンとを内蔵するシリンダブロック上にシリンダヘッドを搭載しており、ディーゼルエンジン５（シリンダヘッド）右側面に、エアクリーナ２２１にターボ過給機２１１を介して接続させる吸気マニホールド２０３と、排気マニホールド２０４からの排気ガスの一部を再循環させるＥＧＲ装置２１０を配置し、排気マニホールド２０４に排出された排気ガスの一部が、吸気マニホールド２０３に還流することによって、高負荷運転時の最高燃焼温度が低下し、ディーゼルエンジン５からのＮＯｘ（窒素酸化物）の排出量が低減するように構成している。一方、ディーゼルエンジン５（シリンダヘッド）左側面に、テールパイプ２２９に接続させる排気マニホールド２０４と、ターボ過給機２１１を配置する。即ち、エンジン５においてエンジン出力軸に沿う左右側面に、吸気マニホールド２０３と排気マニホールド２０４とを振分け配置すると共に、ディーゼルエンジン５（シリンダブロック）前面側に冷却ファン２０６を配置する。 Next, the diesel engine 5 and the engine room structure under the bonnet 6 will be described with reference to FIG. 6, FIG. 9, FIG. The diesel engine 5 has a cylinder head mounted on a cylinder block containing an engine output shaft and a 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). An intake manifold 203 and an EGR device 210 that recirculates a part of the exhaust gas from the exhaust manifold 204 are arranged, and a part of the exhaust gas discharged to the exhaust manifold 204 is returned to the intake manifold 203 to increase the amount of exhaust gas. The maximum combustion temperature during load operation is lowered, and the amount of NOx (nitrogen oxide) emissions from the diesel engine 5 is 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, in the engine 5, 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, and the cooling fan 206 is arranged on the front side of the diesel engine 5 (cylinder block).
　加えて、図６、図９、図１０などに示す如く、ディーゼルエンジン５は、ディーゼルエンジン５の上面側（排気マニホールド２０４上方）に配置する連続再生式の排気ガス浄化装置２２４（ＤＰＦ）を備え、排気ガス浄化装置２２４の排気側にテールパイプ２２９を接続している。排気ガス浄化装置２２４によって、エンジン５からテールパイプ２２９を介して機外に排出される排気ガス中の粒子状物質（ＰＭ）が除去されると共に、排気ガス中の一酸化炭素（ＣＯ）や炭化水素（ＨＣ）が低減されるように構成している。 In addition, as shown in FIGS. 6, 9, 10, etc., the diesel engine 5 includes a continuously regenerative exhaust gas purification device 224 (DPF) disposed on the upper surface side of the diesel engine 5 (above the exhaust manifold 204). The tail pipe 229 is connected to the exhaust side of the exhaust gas 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.
　さらに、図１、図６、図９などに示す如く、ボンネット６は、前部下側にフロントグリル２３１を有し、エンジンルーム２００の上面側と前面側を覆う。ボンネット６の左右下側に、多孔板で形成した側部エンジンカバー２３２を配置して、エンジンルーム２００左右側方を覆っている。すなわち、ボンネット６及びエンジンカバー２３２によって、ディーゼルエンジン５の前方、上方及び左右を覆っている。 Further, as shown in FIG. 1, FIG. 6, FIG. 9, etc., the bonnet 6 has a front grille 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.
　また、ファンシュラウド２３４を背面側に取り付けたラジエータ２３５を、エンジン５の前面側に位置するようにエンジンフレーム１４上に立設している。ファンシュラウド２３４は冷却ファン２０６の外周側を囲っていて、ラジエータ２３５と冷却ファン２０６とを連通させている。ラジエータ２３５前面側に矩形枠状の枠フレーム２２６を設け、枠フレーム２２６の前面の上方位置にエアクリーナ２２１を配置している。なお、枠フレーム２２６内には、上記のインタークーラ他、オイルクーラや燃料クーラなどが設置される。 Further, 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. A rectangular frame-like frame 226 is provided on the front side of the radiator 235, and an air cleaner 221 is disposed above the front surface of the frame frame 226. In addition to the above intercooler, an oil cooler, a fuel cooler, and the like are installed in the frame frame 226.
　一方、図１０などに示す如く、左右一対の機体フレーム１５は、支持用梁フレーム２３６によって連結されている。支持用梁フレーム２３６は、左右の機体フレーム１６それぞれとボルト締結して、左右の機体フレーム１６の前端部（エンジン５後面側）に架設しており、防振ゴムを有する機関脚体を介して、支持用梁フレーム２３６上面にディーゼルエンジン５の後部を連結する。なお、左右一対のエンジンフレーム１４の中途部に、防振ゴムを有する左右の前部機関脚体２３８を介して、ディーゼルエンジン５前部の左右側面を連結している。即ち、エンジンフレーム１４にディーゼルエンジン５前側を防振支持させると共に、左右一対の機体フレーム１６の前端側に支持用梁フレーム２３６を介してディーゼルエンジン５の後部を防振支持させている。 On the other hand, as shown in FIG. 10 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 16 and is installed on the front end portions (rear side of the engine 5) of the left and right airframe frames 16 via the engine legs having vibration-proof rubber. The rear part of the diesel engine 5 is connected to the upper surface of the support beam frame 236. Note that the left and right side surfaces of the front part of the diesel engine 5 are connected to the middle part of the pair of left and right engine frames 14 via left and right front engine legs 238 having anti-vibration rubber. In other words, the front side of the diesel engine 5 is supported on the engine frame 14 by vibration isolation, and the rear portion of the diesel engine 5 is supported on the front end side of the pair of left and right body frames 16 via the support beam frame 236.
　また、前記支持用梁フレーム２３６上面に、左右一対の支柱フレームなどを介して、ボンネットシールド板（遮蔽板）２４４を立設している。ボンネットシールド板２４４にてボンネット６後方を覆う。ディーゼルエンジン５が内装されるエンジンルーム２００は、ボンネット６と、左右の側部エンジンカバー２３２と、ファンシュラウド２３４と、ボンネットシールド板２４４にて囲まれた空間にて形成される。なお、ボンネットシールド板２４４をキャビン７前面から離間させて配置することで、ボンネット６後方に配置されるキャビン７とボンネットシールド板２４４との間に断熱層を形成する。従って、キャビン７側がエンジンルーム２００からの排熱により加温されることを防止できるから、キャビン７内におけるオペレータは、ディーゼルエンジン５や排気ガス浄化装置２２４の排熱の影響をうけることなく、快適に操縦可能となる。 Further, a bonnet shield plate (shield plate) 244 is erected on the upper surface of the support beam frame 236 via a pair of left and right support frames. The back of the hood 6 is covered with a hood shield plate 244. The engine room 200 in which the diesel engine 5 is housed is formed in a space surrounded by the hood 6, the left and right side engine covers 232, the fan shroud 234, and the hood shield plate 244. In addition, the heat insulation layer is formed between the cabin 7 arrange | positioned behind the bonnet 6 and the bonnet shield board 244 by arrange | positioning the bonnet shield board 244 away from the cabin 7 front surface. Accordingly, the cabin 7 side can be prevented from being heated by exhaust heat from the engine room 200, so that the operator in the cabin 7 is comfortable without being affected by the exhaust heat of the diesel engine 5 or the exhaust gas purification device 224. Can be maneuvered.
　さらに、ファンシュラウド２３４の上部とボンネットシールド板２４４の上部の間に左右一対の梁フレーム２４８を架設させる。ファンシュラウド２３４上部及びボンネットシールド板２４４上部を、一対の梁フレーム２４８にて連結し、これらの部材が一体的になって全体として堅牢なエンジンルーム２００のフレーム構造体を構成すると共に、左右一対の梁フレーム２４８に遮熱板２５０の左右両縁を固着し、ディーゼルエンジン５上側の排気ガス浄化装置２２４などを遮熱板２５０にて覆う。排気ガス浄化装置２２４の上に遮熱板２５０を配置することで、排気ガス浄化装置２２４及びディーゼルエンジン５の排熱によるボンネット６の加温を防止できると共に、ボンネット６と遮熱板２５０との間に空間を形成して、遮熱板２５０下側のエンジンルーム２００内を外気から断熱して、排気ガス浄化装置２２４を高温環境で動作させることができるように構成している。 Further, a pair of left and right beam frames 248 are installed between the upper part of the fan shroud 234 and the upper part of the bonnet shield plate 244. The upper part of the fan shroud 234 and the upper part of the bonnet shield plate 244 are connected by a pair of beam frames 248, and these members are integrated to form a robust frame structure of the engine room 200 as a whole. The left and right edges of the heat shield plate 250 are fixed to the beam frame 248, and the exhaust gas purifying device 224 on the upper side of the diesel engine 5 is covered with the heat shield plate 250. By disposing the heat shield plate 250 on the exhaust gas purification device 224, it is possible to prevent the bonnet 6 from being heated by the exhaust heat of the exhaust gas purification device 224 and the diesel engine 5, and to prevent the hood 6 and the heat shield plate 250 from being heated. A space is formed in between so that the inside of the engine room 200 below the heat shield plate 250 is insulated from the outside air so that the exhaust gas purification device 224 can be operated in a high temperature environment.
　ボンネットシールド板２４４前面上縁に、ボンネット支持ブラケット２５５を設け、ボンネット６の後端部を回動可能に支持し、ボンネット支持ブラケット２５５のヒンジ部を支点にしてボンネット６の前部を昇降動させるように構成している。また、ボンネット６下方における遮熱板２５０の左右両側に、伸縮可能なガススプリング２５６を配置している。左右一対の梁フレーム２４８の後端側に左右一対のガススプリング２５６の一端（後端）を枢着させると共に、ボンネット６上部内側面にガススプリング２５６の他端（前端）を枢着している。従って、ボンネット６の前部を持上げることによって、ボンネット支持ブラケット２５５のヒンジ部を軸支点としてボンネット６前部を上方に開動させ、エンジンルーム２００前部上面側を開放して、ディーゼルエンジン５などのメンテナンス作業等を実行できる。 A bonnet support bracket 255 is provided on the upper front edge of the bonnet shield plate 244, the rear end of the bonnet 6 is rotatably supported, and the front part of the bonnet 6 is moved up and down with the hinge portion of the bonnet support bracket 255 as a fulcrum. It is configured as follows. In addition, expandable and contractible gas springs 256 are disposed on the left and right sides of the heat shield plate 250 below the bonnet 6. One end (rear end) of a pair of left and right gas springs 256 is pivotally attached to the rear end side of the pair of left and right beam frames 248, and the other end (front end) of the gas spring 256 is pivotally attached to the upper inner surface of the bonnet 6. . Therefore, by lifting the front part of the bonnet 6, the front part of the bonnet 6 is moved upward with the hinge part of the bonnet support bracket 255 as an axis fulcrum, and the upper surface side of the front part of the engine room 200 is opened. Maintenance work can be performed.
　次に、図５～図２４を参照して、前記昇降機構２２及びリンク機構１１１の取付け構造について説明する。前記ミッションケース１７は、主変速入力軸２８などを有する前部変速ケース１１２と、後車軸ケース１９などを有する後部変速ケース１１３と、前部変速ケース１１２の後側に後部変速ケース１１３の前側を連結させる中間ケース１１４を備えている。中間ケース１１４の左右側面に左右の上下機体連結軸体１１５，１１６を介して左右の機体フレーム１５の後端部を連結する。即ち、２本の上機体連結軸体１１５と、２本の下機体連結軸体１１６にて、中間ケース１１４の左右両側面に左右の機体フレーム１５の後端部を連結させ、機体フレーム１５とミッションケース１７を一体的に連設して、走行機体２の後部を構成すると共に、左右の機体フレーム１５の間に前部変速ケース１１２または動力伝達軸２９などを配置して、前部変速ケース１１２などを保護するように構成している。 Next, with reference to FIGS. 5 to 24, the mounting structure of the elevating mechanism 22 and the 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 end portions 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.
　また、昇降機構２２は、前記ワンタッチ昇降レバー３４または作業部ポジションダイヤル５１の操作にて作動制御する左右の油圧リフトシリンダ１１７と、ミッションケース１７のうち後部変速ケース１１３上面側に設ける開閉可能な上面蓋体１１８にリフト支点軸１１９を介して基端側を回動可能に軸支する左右のリフトアーム１２０と、左右のロワーリンク２３に左右のリフトアーム１２０を連結させる左右のリフトロッド１２１を有している。右のリフトロッド１２１の一部を油圧制御用の水平シリンダ１２２にて形成し、右のリフトロッド１２１の長さを水平シリンダ１２２にて伸縮調節可能に構成している。 The lifting mechanism 22 includes left and right hydraulic lift cylinders 117 that are controlled by operation of the one-touch lifting lever 34 or the working unit position dial 51, and an upper surface that can be opened and closed provided on the upper side of the rear transmission case 113 of the transmission case 17. The lid 118 has left and right lift arms 120 that pivotally support the base end side through a lift fulcrum shaft 119 and left and right lift rods 121 that connect the left and right lift arms 120 to the left and right lower links 23. is doing. 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.
　なお、図２０などに示す如く、上面蓋体１１８の背面側にトップリンクヒンジ１２３を固着し、トップリンクヒンジ１２３にヒンジピン１２４を介してトップリンク２４を連結する。トップリンク２４と左右のロワーリンク２３に対地作業機を支持した状態下で、水平シリンダ１２２のピストンを伸縮させて、右のリフトロッド１２１の長さを変更した場合、前記対地作業機の左右傾斜角度が変化するように構成している。 Note that, as shown in FIG. 20 and the like, a 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 124. 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.
　図１３、図１９に示す如く、ミッションケース１７の側面部外側または底面部外側に着脱可能に固着するヒッチ体１３１を備える。該ヒッチ体１３１の左右側部に左右のロワーリンク支点軸体１３０を設け、ヒッチ体１３１の左右側部に左右のロワーリンク支点軸体１３０を介して左右のロワーリンク２３の基端側を回動可能に支持している。ヒッチ体１３１は、後部変速ケース１１３（ミッションケース１７）の側面部外側にボルト１３４締結する左右の側板体１３２と、後部変速ケース１１３（ミッションケース１７）の底面部外側にボルト１３５締結する底板体１３３を有する。底板体１３３の左右端部に左右の側板体１３２の下端側を一体的に固着し、後部変速ケース１１３（ミッションケース１７）の側面部と底面部を前記ヒッチ体１３１にて囲むように構成している。 As shown in FIGS. 13 and 19, a hitch body 131 detachably fixed to the outer side surface or the outer bottom surface of the mission case 17 is provided. Left and right lower link fulcrum shafts 130 are provided on the left and right side portions of the hitch body 131, and the base ends of the left and right lower links 23 are rotated on the left and right side portions of the hitch body 131 via the left and right lower link fulcrum shaft bodies 130. Supports movable. The hitch body 131 includes left and right side plates 132 that are fastened with bolts 134 to the outside of the side surface of the rear transmission case 113 (transmission case 17), and a bottom plate that is fastened with bolts 135 to the outside of the bottom surface of the rear transmission case 113 (mission case 17). 133. The bottom plate 133 is integrally fixed to the left and right ends of the left and right side plates 132 so that the side and bottom portions of the rear transmission case 113 (mission case 17) are surrounded by the hitch body 131. ing.
　また、図１３、図２０、図２１を参照して、前記ロワーリンク２３の取付け構造を説明する。側板体１３２の機外側面に支点軸ボス１３６と支点軸受けブラケット１３７を固着し、支点軸ボス１３６にロワーリンク支点軸体１３０の一端側を嵌挿させると共に、ロワーリンク支点軸体１３０の他端側に軸止め板１３８を固着するものであり、支点軸受けブラケット１３７に機外側方からロワーリンク支点軸体１３０の一端側を貫通させ、ロワーリンク２３基端部と支点軸ボス１３６にロワーリンク支点軸体１３０の一端側を嵌着させ、支点軸受けブラケット１３７の機外側面に軸止め板１３８をボルト１３９締結させる。即ち、ミッションケース１７の左右外側方向から前記ヒッチ体１３１にロワーリンク支点軸体１３０を着脱させ、ロワーリンク２３を着脱可能に構成している。なお、ロワーリンク支点軸体１３０にロワーリンク２３基端部を折り曲げ自在に自在軸受している。 The mounting structure of the lower link 23 will be described with reference to FIG. 13, FIG. 20, and FIG. A fulcrum shaft boss 136 and a fulcrum bearing bracket 137 are fixed to the outer surface of the side plate 132, and one end side of the lower link fulcrum shaft 130 is fitted into the fulcrum shaft boss 136, and the other end of the lower link fulcrum shaft 130 is inserted. A shaft stopper plate 138 is fixed to the side, and one end side of the lower link fulcrum shaft body 130 is passed through the fulcrum bearing bracket 137 from the outside of the machine, and the lower link fulcrum is supported by the lower link 23 base end and the fulcrum shaft boss 136. One end of the shaft body 130 is fitted, and a shaft stopper plate 138 is fastened to the machine outer surface of the fulcrum bearing bracket 137 with a bolt 139. That is, the lower link fulcrum shaft body 130 is attached to and detached from the hitch body 131 from the left and right outer sides of the mission case 17 so that the lower link 23 can be attached and detached. The lower link fulcrum shaft body 130 has a lower link 23 base end portion that is freely foldable.
　一方、図１１～図１３、図１９～図２１を参照して、前記リフトシリンダ１１７の取付け構造を説明する。リフト支点軸１１９にリフトアーム１２０基端部を軸支し、リフトアーム１２０先端側にリフトロッド１２１（水平シリンダ１２２）を連結すると共に、リフトアーム１２０中間にピストン受け軸１４１を介して単動構造のリフトシリンダ１１７のピストン１４２先端側（上端側）を連結させる。また、側板体１３２の機外側面にシリンダ軸ボス１４５とシリンダ受け体１４６を固着し、シリンダ軸ボス１４５にシリンダ取付け軸体１４７の一端側を嵌挿させると共に、シリンダ取付け軸体１４７の他端側に軸止め板１４８を固着するものであり、シリンダ受け体１４６に機外側方からシリンダ取付け軸体１４７の一端側を貫通させ、リフトシリンダ１１７の基端部（下端側）とシリンダ軸ボス１４５にシリンダ取付け軸体１４７の一端側を嵌着させ、シリンダ受け体１４６の機外側面に軸止め板１４８をボルト１４９締結させる。 On the other hand, the mounting structure of the lift cylinder 117 will be described with reference to FIG. 11 to FIG. 13 and FIG. 19 to FIG. A lift arm 120 base end is pivotally supported on the lift fulcrum shaft 119, a lift rod 121 (horizontal cylinder 122) is connected to the lift arm 120 distal end side, and a single acting structure is provided between the lift arm 120 and a piston receiving shaft 141. The front end side (upper end side) of the piston 142 of the lift cylinder 117 is connected. Further, the cylinder shaft boss 145 and the cylinder receiving body 146 are fixed to the outer side surface of the side plate body 132, and one end side of the cylinder mounting shaft body 147 is fitted into the cylinder shaft boss 145, and the other end of the cylinder mounting shaft body 147 is inserted. A shaft stopper plate 148 is fixed to the side, and one end side of the cylinder mounting shaft body 147 is passed through the cylinder receiving body 146 from the outside of the machine, and the base end portion (lower end side) of the lift cylinder 117 and the cylinder shaft boss 145 One end side of the cylinder mounting shaft body 147 is fitted to the cylinder mounting body 146, and a shaft stopper plate 148 is fastened to the machine outer surface of the cylinder receiving body 146 with a bolt 149.
　即ち、シリンダ取付け軸体１４７の外側方にロワーリンク２３を延設させ、シリンダ取付け軸体１４７の取付け部の外側方をロワーリンク２３にて遮蔽したものであり、ロワーリンク２３を取外した状態下で、ミッションケース１７の左右外側方向から前記ヒッチ体１３１にシリンダ取付け軸体１４７を着脱させ、リフトシリンダ１１７を着脱可能に構成している。換言すると、ロワーリンク支点軸体１３０を介して支点軸受けブラケット１３７にロワーリンク２３を装着した状態下では、シリンダ取付け軸体１４７を抜き出して、リフトシリンダ１１７を取外すことができないように構成している。 That is, the lower link 23 is extended to the outer side of the cylinder mounting shaft body 147, and the outer side of the mounting portion of the cylinder mounting shaft body 147 is shielded by the lower link 23, and the lower link 23 is removed. Thus, the cylinder mounting shaft body 147 is attached to and detached from the hitch body 131 from the left and right outer sides of the transmission case 17 so that the lift cylinder 117 can be attached and detached. In other words, in a state where the lower link 23 is attached to the fulcrum bearing bracket 137 via the lower link fulcrum shaft body 130, the cylinder mounting shaft body 147 is extracted and the lift cylinder 117 cannot be removed. .
　一方、図１３、図１６～図１９に示す如く、図示しない台車などを牽引する牽引アーム１５１を備えている。牽引アーム１５１の後端部に台車連結用の牽引ピン１５２を設けると共に、側板体１３２の後端部に上下規制板１５３を固着し、上下規制板１５３に左右規制ピン１５４を設けて、上下規制板１５３と左右規制ピン１５４の間に牽引アーム１５１の中間部を貫通させる。また、底板体１３３の下面に牽引ブラケット１５５を固着し、係止軸体１５６を介して牽引ブラケット１５５に牽引アーム１５１の前端側を前後位置調節可能に連結している。なお、牽引アーム１５１が不必要なとき、係止軸体１５６を離脱させた後、牽引アーム１５１を後方に抜き出して、牽引アーム１５１を取外すように構成している。 On the other hand, as shown in FIGS. 13 and 16 to 19, a pulling arm 151 for pulling a cart (not shown) is provided. A pulling pin 152 for connecting the carriage is provided at the rear end portion of the pulling arm 151, and a vertical restriction plate 153 is fixed to the rear end portion of the side plate body 132, and a left and right restriction pin 154 is provided on the vertical restriction plate 153. An intermediate portion of the pull arm 151 is passed between the plate 153 and the left and right restricting pins 154. Further, a traction bracket 155 is fixed to the lower surface of the bottom plate body 133, and the front end side of the traction arm 151 is connected to the traction bracket 155 via a locking shaft body 156 so that the front and rear positions can be adjusted. When the pulling arm 151 is unnecessary, the locking shaft body 156 is detached, and then the pulling arm 151 is extracted rearward to remove the pulling arm 151.
　図１、図１１～図２１に示す如く、ディーゼルエンジン５を搭載する走行機体２と、走行機体２に作業機を装着するリンク機構１１１と、リンク機構１１１を昇降動する昇降機構２２を備え、走行機体２の一部をミッションケース１７にて構成し、リンク機構１１１の一部を左右のロワーリンク２３にて構成し、昇降機構２２の一部をリフトシリンダ１１７にて構成し、走行機体２に作業機を昇降可能に取付けるトラクタにおいて、ミッションケース１７にロワーリンク支点軸体１３０を介して左右のロワーリンク２３の基端側を連結する構造であって、ミッションケース１７の側面部外側または底面部外側に着脱可能に固着するヒッチ体１３１を備え、該ヒッチ体１３１の左右側部に左右のロワーリンク支点軸体１３０を設け、ヒッチ体１３１の左右側部に左右のロワーリンク支点軸体１３０を介して左右のロワーリンク２３の基端側を支持するように構成している。したがって、走行機体２を共用して、エンジン５またはロワーリンク２３などの仕様を変更することにより、異なる機種を容易に構成でき、設計製作などの作業性を向上できる。また、ヒッチ体１３１と左右のロワーリンク支点軸体１３０をユニット構造に構成でき、左右のロワーリンク２３を取付けるためのヒッチ構造を簡略化できると共に、大型の作業機に適応した支持荷重を簡単に確保できる。 As shown in FIGS. 1 and 11 to 21, a traveling machine body 2 on which a diesel engine 5 is mounted, a link mechanism 111 for mounting a work machine on the traveling machine body 2, and a lifting mechanism 22 for moving the link mechanism 111 up and down are provided. A part of the traveling machine body 2 is constituted by the mission case 17, a part of the link mechanism 111 is constituted by the left and right lower links 23, and a part of the elevating mechanism 22 is constituted by the lift cylinder 117. In the tractor to which the work implement is mounted so as to be able to move up and down, the base end side of the left and right lower links 23 is connected to the transmission case 17 via the lower link fulcrum shaft 130, A hitch body 131 that is detachably fixed to the outside of the unit, and left and right lower link fulcrum shaft bodies 130 are provided on the left and right side portions of the hitch body 131, It is configured to support the base end side of the right and left lower link 23 via the left and right lower link fulcrum shaft 130 on the left and right side portions 31. Therefore, by sharing the traveling machine body 2 and changing the specifications of the engine 5 or the lower link 23, different models can be easily configured, and workability such as design and production can be improved. Further, the hitch body 131 and the left and right lower link fulcrum shaft bodies 130 can be configured in a unit structure, the hitch structure for attaching the left and right lower links 23 can be simplified, and a support load suitable for a large working machine can be easily obtained. It can be secured.
　図１１～図２１に示す如く、前記ヒッチ体１３１は、ミッションケース１７の側面部外側に締結する左右の側板体１３２と、ミッションケース１７の底面部外側に締結する底板体１３３を有し、底板体１３３の左右端部に左右の側板体１３２の下端側を一体的に固着し、ミッションケース１７の側面部と底面部を前記ヒッチ体１３１にて囲むように構成している。したがって、ミッションケース１７の左右側面に配置させる後車軸ケース１９と前記ヒッチ体１３１の干渉を容易に防止できるものでありながら、大型の作業機に適応した支持荷重を簡単に確保できる。 As shown in FIGS. 11 to 21, the hitch body 131 has left and right side plate bodies 132 fastened to the outside of the side surface portion of the mission case 17, and a bottom plate body 133 fastened to the outside of the bottom surface portion of the mission case 17. The lower end sides of the left and right side plate bodies 132 are integrally fixed to the left and right end portions of the body 133, and the side and bottom portions of the mission case 17 are surrounded by the hitch body 131. Accordingly, it is possible to easily prevent the rear axle case 19 disposed on the left and right side surfaces of the mission case 17 and the hitch body 131, and to easily secure a supporting load adapted to a large working machine.
　図１１～図２１に示す如く、昇降機構２２の一部を左右のリフトアーム１２０にて構成し、ミッションケース１７にリフト支点軸１１９を介して左右のリフトアーム１２０基端側を連結し、左右のリフトアーム１２０先端側にリフトロッド１２１を介して左右のロワーリンク２３中間を連結し、左右のリフトアーム１２０中間にリフトシリンダ１１７を取付ける構造であって、ヒッチ体１３１のシリンダ受け体１４６にシリンダ取付け軸体１４７を介してリフトシリンダ１１７を連結している。したがって、ミッションケース１７の上面側に左右のリフトアーム１２０を配置でき、ミッションケース１７の背面側にリフトシリンダ１１７を配置でき、ミッションケース１７後部の左右側面及び上下面を有効に活用して、昇降機構２２をコンパクトに組付けることができるものでありながら、昇降機構２２の組付け分解作業性などを向上できる。 As shown in FIGS. 11 to 21, a part of the lifting mechanism 22 is constituted by the left and right lift arms 120, and the base ends of the left and right lift arms 120 are connected to the transmission case 17 via the lift fulcrum shaft 119. The middle of the left and right lower links 23 is connected to the tip of the lift arm 120 via a lift rod 121, and the lift cylinder 117 is attached to the middle of the left and right lift arms 120, and the cylinder receiver 146 of the hitch body 131 is connected to the cylinder. A lift cylinder 117 is connected via an attachment shaft body 147. Therefore, the left and right lift arms 120 can be disposed on the upper surface side of the mission case 17, the lift cylinder 117 can be disposed on the rear surface side of the mission case 17, and the left and right side surfaces and the upper and lower surfaces of the rear portion of the mission case 17 can be effectively utilized to move up and down. While the mechanism 22 can be assembled compactly, the assembly / disassembly workability of the elevating mechanism 22 can be improved.
　図１１～図２１に示す如く、シリンダ取付け軸体１４７の外側方にロワーリンク２３を延設させると共に、ロワーリンク支点軸体１３０またはシリンダ取付け軸体１４７を、ミッションケース１７の左右外側方向からヒッチ体１３１に着脱可能に構成している。したがって、走行機体２の左右機外側方からロワーリンク支点軸体１３０またはシリンダ取付け軸体１４７を容易に着脱操作でき、ロワーリンク２３またはリフトシリンダ１１７などの組付け分解作業性を向上できるものでありながら、シリンダ取付け軸体１４７の取付け部の外側方を前記ロワーリンク２３にて遮蔽できる。即ち、ロワーリンク２３の離脱操作、またはリフトアーム１２０とリフトシリンダ１１７のピストン１４２の離脱操作が、リフトシリンダ１１７の離脱操作に優先して実行されるから、ロワーリンク２３を取付けた状態では、シリンダ取付け軸体１４７を抜き出して、リフトシリンダ１１７を外せないように構成でき、リンク機構１１１などの分解作業性を向上できる。 As shown in FIGS. 11 to 21, the lower link 23 is extended to the outside of the cylinder mounting shaft 147, and the lower link fulcrum shaft 130 or the cylinder mounting shaft 147 is hitch from the left and right outer sides of the transmission case 17. The body 131 is detachable. Accordingly, the lower link fulcrum shaft body 130 or the cylinder mounting shaft body 147 can be easily attached / detached from the outer sides of the left and right machines of the traveling machine body 2, and the assembly / disassembly workability of the lower link 23 or the lift cylinder 117 can be improved. However, the outer side of the mounting portion of the cylinder mounting shaft body 147 can be shielded by the lower link 23. That is, since the operation of detaching the lower link 23 or the operation of detaching the piston 142 of the lift arm 120 and the lift cylinder 117 is performed with priority over the operation of detaching the lift cylinder 117, the cylinder is The mounting shaft body 147 can be extracted so that the lift cylinder 117 cannot be removed, and the disassembly workability of the link mechanism 111 and the like can be improved.
　なお、本願発明における各部の構成は図示の実施形態に限定されるものではなく、本願発明の趣旨を逸脱しない範囲で種々変更が可能である。 The configuration of each part in the present invention is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.
２　走行機体
５　ディーゼルエンジン
１７　ミッションケース
２２　油圧式昇降機構
２３　ロワーリンク
１１１　３点リンク機構
１１７　油圧リフトシリンダ
１１９　リフト支点軸
１２０　リフトアーム
１２１　リフトロッド
１３０　ロワーリンク支点軸体
１３１　ヒッチ体
１３２　側板体
１３３　底板体
１４６　シリンダ受け体
１４７　シリンダ取付け軸体 2 traveling machine body 5 diesel engine 17 mission case 22 hydraulic lift mechanism 23 lower link 111 three-point link mechanism 117 hydraulic lift cylinder 119 lift fulcrum shaft 120 lift arm 121 lift rod 130 lower link fulcrum shaft body 131 hitch body 132 side plate body 133 bottom plate Body 146 Cylinder receiving body 147 Cylinder mounting shaft body

Claims (4)

  1. 　エンジンを搭載する走行機体と、前記走行機体に作業機を装着するリンク機構と、前記リンク機構を昇降動する昇降機構を備え、前記走行機体の一部をミッションケースにて構成し、前記リンク機構の一部を左右のロワーリンクにて構成し、前記昇降機構の一部をリフトシリンダにて構成し、前記走行機体に作業機を昇降可能に取付けるトラクタにおいて、
    　前記ミッションケースにロワーリンク支点軸体を介して前記左右のロワーリンクの基端側を連結する構造であって、前記ミッションケースの側面部外側または底面部外側に着脱可能に固着するヒッチ体を備え、該ヒッチ体の左右側部に左右のロワーリンク支点軸体を設け、前記ヒッチ体の左右側部に左右のロワーリンク支点軸体を介して前記左右のロワーリンクの基端側を支持するように構成したことを特徴とするトラクタ。     A traveling machine body on which an engine is mounted; a link mechanism that mounts a work machine on the traveling machine body; and a lifting mechanism that moves the link mechanism up and down. A part of the traveling machine body is configured by a transmission case, and the link mechanism A part of the left and right lower links, a part of the lifting mechanism is constituted by a lift cylinder, and a tractor that attaches the working machine to the traveling machine body so that it can be raised and lowered,
    The transmission case has a structure in which the base end sides of the left and right lower links are connected to the mission case via a lower link fulcrum shaft, and includes a hitch body that is detachably fixed to the outer side surface or the outer bottom surface of the transmission case. The left and right lower link fulcrum shafts are provided on the left and right side portions of the hitch body, and the left and right lower link fulcrum shaft bodies are supported on the left and right side portions of the hitch body via the left and right lower link fulcrum shaft bodies. A tractor characterized by comprising
  2. 　前記ヒッチ体は、前記ミッションケースの側面部外側に締結する左右の側板体と、前記ミッションケースの底面部外側に締結する底板体を有し、前記底板体の左右端部に左右の側板体の下端側を一体的に固着し、前記ミッションケースの側面部と底面部を前記ヒッチ体にて囲むように構成したことを特徴とする請求項１に記載のトラクタ。 The hitch body has left and right side plates that are fastened to the outside of the side surface of the mission case, and a bottom plate that is fastened to the outside of the bottom of the mission case, and the left and right side plates of the bottom plate are 2. The tractor according to claim 1, wherein a lower end side is integrally fixed, and a side surface portion and a bottom surface portion of the transmission case are surrounded by the hitch body.
  3. 　前記昇降機構の一部を左右のリフトアームにて構成し、前記ミッションケースにリフト支点軸を介して左右のリフトアーム基端側を連結し、前記左右のリフトアーム先端側にリフトロッドを介して前記左右のロワーリンク中間を連結し、前記左右のリフトアーム中間に前記リフトシリンダを取付ける構造であって、前記ヒッチ体のシリンダ受け体にシリンダ取付け軸体を介して前記リフトシリンダを連結したことを特徴とする請求項１に記載のトラクタ。 A part of the lifting mechanism is composed of left and right lift arms, the left and right lift arms are connected to the transmission case via lift fulcrum shafts, and the lift rods are connected to the distal ends of the left and right lift arms via lift rods. The middle of the left and right lower links are connected, and the lift cylinder is attached to the middle of the left and right lift arms, and the lift cylinder is connected to a cylinder receiver of the hitch body via a cylinder mounting shaft. The tractor according to claim 1, wherein the tractor is characterized.
  4. 　前記シリンダ取付け軸体の外側方に前記ロワーリンクを延設させると共に、前記ロワーリンク支点軸体またはシリンダ取付け軸体を、前記ミッションケースの左右外側方向から前記ヒッチ体に着脱可能に構成したことを特徴とする請求項３に記載のトラクタ。 The lower link is extended to the outside of the cylinder mounting shaft body, and the lower link fulcrum shaft body or the cylinder mounting shaft body is configured to be detachable from the hitch body from the left and right outer sides of the transmission case. The tractor according to claim 3, wherein
PCT/JP2015/059519 2014-03-28 2015-03-26 Tractor WO2015147228A1 (en)

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KR102535733B1 (en) * 2021-01-12 2023-05-23 남기성 3-point quick hitch adapter for tractor with adjustable horizontal length
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CN106102443B (en) 2020-01-31

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