WO2018110048A1

WO2018110048A1 - Working vehicle

Info

Publication number: WO2018110048A1
Application number: PCT/JP2017/036328
Authority: WO
Inventors: 竹山　智洋; 土井　邦夫
Original assignee: ヤンマー株式会社
Priority date: 2016-12-15
Filing date: 2017-10-05
Publication date: 2018-06-21
Also published as: TWI663906B; JP2018093821A; CN110062576B; TW201824988A; CN110062576A; JP6726089B2

Abstract

This working vehicle is provided with: a traveling wheel 4 for supporting a traveling machine body; and a cage wheel 100 removably mounted to the traveling wheel 4. The cage wheel 100 is provided with an annular rim 102 and a plurality of cage wheel lugs 105 provided to the rim 102 at appropriate intervals in the circumferential direction of the rim 102. The cage wheel lugs 105 are tilted in side view such that the outer peripheral end 105a side is located further on the upstream side in the rotational direction during the forward movement of the traveling machine body than the inner peripheral end 105c side. The outer peripheral ends 105a of the cage wheel lugs 105 are bent toward the center of rotation of the rim 102.

Description

Work vehicle

The present invention relates to a work vehicle mainly used for farm work such as a riding rice transplanter for farm work.

Some recent paddy rice transplanters have additional wheels to improve running performance in the field. For example, in the riding type rice transplanter described in Patent Document 1, an auxiliary wheel that rotates integrally with the rear wheel is provided on the left and right inner sides or both left and right sides of the rear wheel, thereby improving the wetland running ability of the traveling machine body.

JP 7-329503 A

However, depending on the shape of the auxiliary wheel lug, the lug enters the field cultivator, and the rug entraps the soil, resulting in a problem that the wetland running ability of the traveling machine body is lowered. A riding rice transplanter as an example of a work vehicle has a problem that the traveling machine body sinks in a deep or clay-like field, or the traveling machine body sinks by breaking the cultivator during turning. There is a need for improved wetland running.

The present invention has been made in view of the above-described present situation, and has a technical problem to further improve the wet field running performance of the traveling machine body with a simple configuration.

A work vehicle according to the present invention is a work vehicle including a pair of front wheels and a pair of travel wheels that support a traveling machine body, and includes a basket wheel that is detachably attached to the travel wheel. A rim portion, and a plurality of cage wheel lugs provided on the rim portion at appropriate intervals along the circumferential direction of the rim portion, and the cage wheel lug has an inner peripheral side end on the outer peripheral side in a side view. It inclines so that it may be located in the rotation direction upstream side at the time of advance of the traveling machine body rather than the section side, and the outer peripheral side end of the cage wheel lug is bent toward the rotation center side of the rim section.

In the work vehicle of the present invention, the basket wheel lug may be arranged apart from the traveling wheel.

Further, the work vehicle of the present invention may be configured such that the width of the car wheel lug is wider than the width of the traveling wheel in the rotation axis direction of the traveling wheel.

The work vehicle of the present invention includes a cage wheel that is detachably attached to the traveling wheel, and the cage wheel is provided on the rim portion at an appropriate interval along a circumferential direction of the annular rim portion and the rim portion. A plurality of basket wheel lugs, and the basket wheel lugs are inclined such that, in a side view, the outer peripheral side end portion is positioned upstream of the inner peripheral side end portion side in the rotational direction when the traveling machine body moves forward. The outer peripheral side end portion of the cage wheel lug is bent toward the rotation center side of the rim portion. Thereby, since the angle which the outer peripheral side edge part of a cage wheel lug and the cultivation board of a farm field make becomes smaller, it becomes difficult for a basket wheel lug to enter the cultivation board of an agricultural field, and to cut a cultivation board. In addition, the outer edge of the cage wheel lug is bent toward the center of rotation of the rim portion, so that when the cage wheel lug is raised, it is difficult to hold soil on the downstream surface in the rotational direction when the traveling machine body moves forward. Become. For this reason, it is possible to avoid the risk of the traveling aircraft sinking in a deep field or clayey field or breaking the tiller when turning, and drastically improving the wetland running performance of the traveling aircraft with a simple configuration. Can be planned. Moreover, since the outer peripheral side edge part of the cage wheel lug is bent, the strength of the cage wheel lug can be improved.

In the work vehicle according to the present invention, if the cage wheel lug is disposed away from the traveling wheel, the mud is less lifted and mud is less likely to adhere to the cage wheel lug. This makes it easier for mud to fall and makes it difficult for mud to accumulate on the car wheel lugs, so that a car wheel with good mud removal can be realized, and the running performance of the traveling machine can be improved.

In the work vehicle of the present invention, if the width of the car wheel lug is wider than the width of the running wheel in the rotation axis direction of the running wheel, the buoyancy generated by the car wheel lug is greatly increased. Therefore, the sinking of the traveling aircraft can be suppressed in deep fields and clay fields.

It is a left view of the riding type rice transplanter in the embodiment. It is a top view of a riding type rice transplanter. It is a left view which shows an engine, a transmission case, a rear axle case, etc. It is a top view which shows an engine, a transmission case, a rear axle case, etc. It is a drive system figure of a riding type rice transplanter. It is a left view of a cage wheel, a rear wheel, and an inner side auxiliary wheel. FIG. 7 is a cross-sectional view taken along the line AA in FIG. 6. It is a perspective view of a basket wheel, a rear wheel, and an inside auxiliary wheel. It is a separation perspective view of a basket wheel, a rear wheel, and an inside auxiliary wheel. It is a left view which expands and shows a cage wheel and a rear wheel. It is a top view which shows the positional relationship of a cage wheel and a planting nail | claw. It is a schematic diagram which shows the movement locus | trajectory of a cage wheel lug.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings in the case of applying to an eight-row planting type rice transplanter 1 (hereinafter simply referred to as rice transplanter 1). In the following description, the left side in the traveling direction of the traveling machine body 2 is simply referred to as the left side, and the right side in the traveling direction is also simply referred to as the right side.

First, the outline of the rice transplanter 1 will be described with reference to FIGS. The rice transplanter 1 according to the embodiment includes a traveling machine body 2 supported by a pair of left and right front wheels 3 and a pair of left and right rear wheels 4 as traveling wheels. An engine 5 is mounted on the front portion of the traveling machine body 2. Power from the engine 5 is transmitted to the rear transmission case 6 to drive the front wheels 3 and the rear wheels 4 so that the traveling machine body 2 travels forward and backward. A front axle case 7 projects from the left and right sides of the transmission case 6, and the front wheels 3 are attached to a front axle 36 extending from the front axle case 7 to the left and right so as to be steerable. A cylindrical frame 8 protrudes behind the transmission case 6, a rear axle case 9 is fixed to the rear end side of the cylindrical frame 8, and the rear wheel 4 is attached to a rear axle 37 that extends outward from the rear axle case 9 to the left and right. ing.

As shown in FIG. 1 and FIG. 2, an operator boarding work step (vehicle body cover) 10 is provided on the upper surface side of the front part and the central part of the traveling machine body 2. A front bonnet 11 is disposed above the front part of the work step 10, and the engine 5 is installed inside the front bonnet 11. A traveling speed change pedal 12 for stepping operation is disposed on the upper side of the work step 10 on the rear side of the front bonnet 11. Although details are omitted, the rice transplanter 1 according to the embodiment adjusts the shift power output from the hydraulic continuously variable transmission 40 of the transmission case 6 by driving the variable speed electric motor according to the depression amount of the travel shift pedal 12. Is configured to do.

Further, a steering handle 14, a traveling main transmission lever (not shown), and a work lever 16 as a lifting operation tool are provided on the driving operation unit 13 on the rear upper surface side of the front bonnet 11. A steering seat 18 is disposed via a seat frame 17 behind the front bonnet 11 on the upper surface of the work step 10. Note that left and right spare seedling platforms 24 are provided on the left and right sides of the front bonnet 11 with the operation step 10 interposed therebetween.

The link frame 19 is erected at the rear end of the traveling machine body 2. An eight-row seedling planting device 23 is connected to the link frame 19 via an elevating link mechanism 22 including a lower link 20 and a top link 21 so as to be elevable. In this case, a hitch bracket 38 is provided on the front side of the seedling planting device 23 via a rolling fulcrum shaft (not shown). By connecting a hitch bracket 38 to the rear side of the lifting link mechanism 22, the seedling planting device 23 is disposed behind the traveling machine body 2 so as to be movable up and down. The cylinder base end side of the hydraulic lift cylinder 39 is supported on the rear upper surface of the cylindrical frame 8 so as to be vertically rotatable. The rod tip side of the lifting cylinder 39 is connected to the lower link 20. As a result of vertically moving the lifting link mechanism 22 by the expansion and contraction of the lifting cylinder 39, the seedling planting device 23 moves up and down. Note that the seedling planting device 23 is configured to be rotatable about the rolling fulcrum axis so as to be able to change the inclined posture in the left-right direction.

The operator gets on the work step 10 from the boarding / alighting step 25 on the side of the work step 10 and drives the seedling planting device 23 to move the seedling planting device 23 and move the seedling planting in the field while moving in the field by the driving operation. Perform work (rice planting work). During the seedling planting operation, the operator replenishes the seedling planting device 23 with a seedling mat on the preliminary seedling mounting table 24 as needed.

As shown in FIGS. 1 and 2, the seedling planting device 23 includes a planting input case 26 to which power is transmitted from the engine 5 via the mission case 6, and four sets of eight strips connected to the planting input case 26. Planting transmission case 27 (one set in Nijo), seedling planting mechanism 28 provided on the rear end side of each planting transmission case 27, seedling mount 29 for eight-row planting, and each planting transmission case 27 And a float 32 for leveling the farm scene disposed on the lower surface side of the head. The seedling planting mechanism 28 is provided with a rotary case 31 having two planting claws 30 for one line. Two rotary cases 31 are arranged in the planting transmission case 27. By one rotation of the rotary case 31, the two planting claws 30 cut out and hold one seedling each and plant it in a field scene leveled by the float 32. On the front side of the seedling planting device 23, a leveling rotor 85 for leveling (leveling) the farm scene is provided so as to be movable up and down.

Although details will be described later, the power from the engine 5 via the transmission case 6 is transmitted not only to the front wheels 3 and the rear wheels 4 but also to the planting input case 26 of the seedling planting device 23. In this case, the power from the transmission case 6 toward the seedling planting device 23 is once transmitted to the inter-plant transmission case 75 provided on the upper right side of the rear axle case 9, and is transmitted from the inter-plant transmission case 75 to the planting input case 26. The The seedling planting mechanism 28 and the seedling mount 29 are driven by the transmitted power. The inter-strain shifting case 75 includes an inter-strain shifting mechanism 76 that switches between planted seedlings to, for example, sparse planting, standard planting, or dense planting, and a planting clutch 77 that interrupts power transmission to the planting planting device 23. (See FIG. 5).

A side marker 33 is provided on the left and right outside of the seedling planting device 23. The side marker 33 includes a marker ring body 34 for muscle pulling and a marker arm 35 that pivotally supports the marker ring body 34 so as to be rotatable. The base end side of each marker arm 35 is pivotally supported on the left and right outer sides of the seedling planting device 23 so as to be rotatable left and right. The side marker 33 raises the marker wheel body 34 by raising the work posture and the working posture that forms the locus that becomes the reference in the next process on the farm scene based on the operation of the work lever 16 in the driving operation unit 13. It is comprised so that it can rotate to the non-working posture separated from.

3 and 4, the traveling machine body 2 includes a pair of left and right machine body frames 50 extending in the front-rear direction. Each body frame 50 is divided into a front frame 51 and a rear frame 52. The rear end portion of the front frame 51 and the front end portion of the rear frame 52 are welded and fixed to a laterally long intermediate connection frame 53. The front ends of the pair of left and right front frames 51 are fixed to the front frame 54 by welding. The rear end sides of the left and right rear frames 52 are fixed to the rear frame 55 by welding. The front frame 54, the left and right front frames 51, and the intermediate connection frame 53 are configured in a square frame shape in plan view. Similarly, the intermediate connection frame 53, the left and right rear frames 52, and the rear frame 55 are also configured in a square frame shape in plan view.

As shown in FIG. 4, the front portions of the left and right front frames 51 are connected by two front and rear base frames 56. An intermediate portion of each base frame 56 is formed in a shape bent into a U shape so as to be positioned lower than the left and right front frames 51. The left and right end portions of each base frame 56 are fixed to the corresponding front frame 51 by welding. The engine 5 is mounted on and supported by the front and rear base frames 56 via a substantially flat engine stand 57 and a plurality of vibration isolating rubbers (not shown). The rear base frame 56 is connected to the front portion of the transmission case 6 via the rear relay bracket 60.

As can be seen from FIG. 4, the rear portions of the left and right front frames 51 are connected to a front axle case 7 protruding from the left and right sides of the mission case 6. The left and right ends of a U-shaped frame 61 extending rearward and obliquely downward in a side view are welded and fixed to the center side of the intermediate connection frame 53. The middle part of the U-shaped frame 61 is connected to the middle part of the cylindrical frame 8 that connects the transmission case 6 and the rear axle case 9 (see FIGS. 3 and 4). The upper end sides of the left and right vertical frames 62 are welded and fixed to the middle portion of the rear frame 55. An intermediate portion of a laterally long rear axle support frame 63 is fixed by welding to the lower ends of the left and right vertical frames 62. The left and right ends of the rear axle support frame 63 are connected to the rear axle case 9. A muffler 65 for reducing the exhaust noise of the engine 5 is disposed below the step support base 64 projecting outward from the left front frame 51.

As shown in FIGS. 3 and 4, a power steering unit 66 is provided in the front part of the mission case 6 disposed behind the engine 5. Although details are omitted, a handle shaft is rotatably disposed inside a handle post erected on the upper surface of the power steering unit 66. A steering handle 14 is fixed to the upper end side of the handle shaft. On the lower surface side of the power steering unit 66, a steering output shaft (not shown) protrudes downward. A steering rod 68 (see FIG. 4) for steering the left and right front wheels 3 is connected to the steering output shaft.

The engine 5 of the embodiment is disposed on an intermediate portion of the front and rear base frames 56 with the output shaft 70 (crank shaft) directed in the left-right direction. The left and right widths of the engine 5 and the engine stand 57 are smaller than the inner dimensions between the left and right front frames 51, and the lower side of the engine 5 and the engine stand 57 are disposed on the middle part of the front and rear base frames 56. Thus, it is exposed below the left and right front frames 51. In this case, the output shaft 70 (axis line) of the engine 5 is in a position overlapping the left and right front frames 51 in a side view. An exhaust pipe 69 communicating with the exhaust system of the engine 5 is disposed on one of the left and right side surfaces (left side surface in the embodiment) of the engine 5. The proximal end side of the exhaust pipe 69 is connected to each cylinder of the engine 5, and the distal end side of the exhaust pipe 69 is connected to the exhaust inlet side of the muffler 65.

Next, the drive system of the rice transplanter 1 will be described with reference to FIG. The output shaft 70 of the engine 5 protrudes outward from the left and right side surfaces of the engine 5. An engine output pulley 72 is provided at the protruding end of the output shaft 70 that protrudes from the left side of the engine 5, a mission input pulley 73 is provided at the mission input shaft 71 that protrudes outward from the mission case 6, and is transmitted to both

pulleys

72, 73. A belt is wrapped around. Power is transmitted from the engine 5 to the transmission case 6 via both

pulleys

72 and 73 and a transmission belt.

In the transmission case 6, the transmission power through the hydraulic continuously variable transmission 40, the planetary gear device 41, the hydraulic continuously variable transmission 40, and the planetary gear device 41 including the hydraulic pump 40 a and the hydraulic motor 40 b is shifted to a plurality of stages. A gear-type sub-transmission mechanism 42, a main clutch 43 that interrupts power transmission from the planetary gear unit 41 to the gear-type sub-transmission mechanism 42, a traveling brake 44 that brakes the output from the gear-type sub-transmission mechanism 42, and the like. ing. The hydraulic pump 40a is driven by power from the mission input shaft 71, hydraulic oil is supplied from the hydraulic pump 40a to the hydraulic motor 40b, and variable speed power is output from the hydraulic motor 40b. The speed change power of the hydraulic motor 40 b is transmitted to the gear type subtransmission mechanism 42 via the planetary gear device 41 and the main clutch 43. Then, power is transmitted from the gear-type sub-transmission mechanism 42 by branching in the two directions of the front and

rear wheels

3 and 4 and the seedling planting device 23.

Part of the branching power toward the front and

rear wheels

3 and 4 is transmitted from the gear-type auxiliary transmission mechanism 42 via the differential gear mechanism 45 to the front axle 36 of the front axle case 7 to drive the left and right front wheels 3 to rotate. . The remainder of the branching power toward the front and

rear wheels

3, 4 is transmitted from the gear-type sub-transmission mechanism 42 through the universal joint shaft 46, the rear drive shaft 47 in the rear axle case 9, a pair of left and right friction clutches 48, and a gear-type transmission mechanism 49. Thus, the rear axle case 9 is transmitted to the rear axle 37 to drive the left and right rear wheels 4 to rotate. When the traveling brake 44 is operated, the output from the gear-type subtransmission mechanism 42 is lost, so that the front and

rear wheels

3 and 4 are braked. When the rice transplanter 1 is turned, the friction clutch 48 inside the turning inside the rear axle case 9 is turned off to rotate the rear wheel 4 inside the turning freely, and the rotation of the rear wheel 4 outside the turning to which power is transmitted is rotated. It turns by driving.

In the rear axle case 9, a rotor drive unit 86 having a leveling rotor clutch for power transmission to the leveling rotor 85 is provided. The power transmitted from the gear-type subtransmission mechanism 42 to the universal joint shaft 46 is also branched and transmitted to the rotor drive unit 86, and is transmitted from the rotor drive unit 86 to the leveling rotor 85 via the universal joint shaft 87. The farm scene is leveled by the rotational drive of the leveling rotor 85.

The branching power toward the seedling planting device 23 is transmitted to the inter-stock transmission case 75 via the PTO transmission shaft mechanism 74 with a universal joint shaft. In the inter-strain shifting case 75, an inter-strain shifting mechanism 76 that switches between seedlings to be planted, for example, to sparse planting, standard planting, or dense planting, and a planting clutch 77 that interrupts power transmission to the planting planting device 23 I have. The power transmitted to the inter-plant transmission case 75 is transmitted to the planting input case 26 via the inter-plant transmission mechanism 76, the planting clutch 77, and the universal joint shaft 78.

In the planting input case 26, a horizontal feed mechanism 79 that moves the seedling platform laterally, a seedling vertical feed mechanism 80 that transports the seedling mat on the seedling platform 29 vertically, and the planting input case 26. A planting output shaft 81 that transmits power to the planting transmission case 27 is provided. By the power transmitted to the planting input case 26, the lateral feed mechanism 79 and the seedling vertical feed mechanism 80 are driven, and the seedling stage 29 is continuously reciprocally moved in the lateral direction. The seedling mat on the seedling table 29 is intermittently transported vertically when reaching the turning point of the reciprocating movement. Power from the planting input case 26 via the planting output shaft 81 is transmitted to each planting transmission case 27, and the rotary case 31 and the planting claw 30 of each planting transmission case 27 are driven to rotate. In addition, when providing a fertilizer, motive power is transmitted from the inter-strain transmission case 75 to a fertilizer.

Next, the detailed structure of the cage wheel 100, the rear wheel 4 as the traveling wheel, and the inner auxiliary wheel 120 will be described with reference to FIG. 1, FIG. 4, and FIG. In the rice transplanter 1 of this embodiment, the inner auxiliary wheel 120, the rear wheel 4, and the cage wheel 100 are arranged in order from the left and right inner sides.

The left and right inner auxiliary wheels 120 include a hub cylinder 121 located at the center of rotation, an annular rim 122, and a spoke 123 that extends radially from the hub cylinder 121 and connects the hub cylinder 121 and the rim 122. And. The rim portion 122 is formed with a rubber ring body 124 and a plurality of protruding outer peripheral lugs 125 by baking hard rubber around the rim portion 122. The front end side (left and right outer sides) of the rear axle 37 has a hexagonal shaft shape, and the hub cylinder portion 121 of the inner auxiliary wheel 120 is fitted on the hexagonal shaft portion 37 a of the rear axle 37.

The left and right rear wheels 4 include a hub cylinder 93 positioned at the center of rotation, an annular rim 90, a spoke 94 extending radially from the hub cylinder 93 and connecting the hub cylinder 93 and the rim 90. Further, a reinforcing plate portion 95 welded to the hub tube portion 93 and the spoke portion 94 is provided. The rim portion 90 is formed with a rubber ring body 91, a plurality of plate-like propulsion lugs 92, and a plurality of protrusion-like outer peripheral lugs 96 by baking hard rubber around the rim portion 90. Each propulsion lug 92 is formed on the rubber ring body 91 at appropriate intervals along the circumferential direction of the rubber ring body 91. Further, each propulsion lug 92 is inclined so that the outer peripheral side end side is positioned on the upstream side in the rotational direction when the traveling machine body 2 moves forward as compared with the inner peripheral side end side in a side view. In other words, each propulsion lug 92 is inclined so as to be displaced to the upstream side in the rotational direction when the traveling machine body 2 moves forward as it moves away from the rotation center of the rim portion 90 in a side view. In this embodiment, 11 propulsion lugs 92 are arranged on the rubber ring 91 at equal intervals.

The hub cylinder portion 93 of the rear wheel 4 is fitted on the hexagonal shaft portion 37 a of the rear axle 37 at a position outside the hub cylinder portion 121 of the inner auxiliary wheel 120. A cylindrical spacer member 126 is also fitted on the hexagonal shaft portion 37 a between the hub cylinder portion 121 of the inner auxiliary wheel 120 and the hub cylinder portion 93 of the rear wheel 4. The hub cylinder portion 93 of the rear wheel 4 is fixed to the hexagonal shaft portion 37a of the rear axle 37 by the lock pin shaft 131 and the stop pin 132 so as not to be detached, thereby the hub cylinder portion 121 of the spacer member 126 and the inner auxiliary wheel 120. Also, the hexagonal shaft portion 37a of the rear axle 37 is held so as not to be detached. A washer 133 having a diameter larger than the inner diameter of the hub cylinder portion 93 of the rear wheel 4 is fixed to the front end surface of the hexagonal shaft portion 37 a of the rear axle 37 by a bolt 134.

The extension axle 110 is bolted to the left and right outer surfaces of the reinforcing plate portion 95 of each rear wheel 4. The extension axle 110 includes a flange portion 111 that is bolted to the reinforcing plate portion 95, an extension axle portion 112 that projects from the center of the left and right outer surfaces of the flange portion 111, the left and right outer surfaces of the flange portion 111, and the extension axle. Three rib portions 113 welded to the base end portion of the portion 112 are provided. The extension axle portion 112 is disposed on the same axis as the rear axle 37. The distal end side (left and right outer sides) of the extension axle portion 112 is a hexagonal shaft portion 112a having a hexagonal shaft shape.

The basket wheel 100 is detachably attached to each rear wheel 4 via the extension axle 110. Each cage wheel 100 includes a hub tube portion 101 located at the center of rotation, an annular rim portion 102, and four spoke portions that extend radially from the hub tube portion 101 and connect the hub tube portion 101 and the rim portion 102. 103, four reinforcing plate portions 104 welded to the hub cylinder portion 101 and the spoke portion 103, and a plurality of basket wheel lugs 105 provided on the rim portion 102 at appropriate intervals along the circumferential direction of the rim portion 102. .

The hub cylinder portion 101 of the cage wheel 100 is fitted on the tip side portion of the hexagonal shaft portion 112a of the extension axle 110. The hub cylinder portion 101 is fixed to the hexagonal shaft portion 112a by a lock pin shaft 135 and a set pin 136 so as not to be detached. Note that a plurality of holes into which the lock pin shaft 135 can be inserted are formed in the axial direction at the tip side portion of the hexagonal shaft portion 112a. The position in the axial direction of the cage wheel 100 with respect to the wheel 4 is configured to be selectable.

In this embodiment, the number of the cage wheel lugs 105 is different from the number (11) of the propulsion lugs 92 of the rear wheel 4, and the rim portion 102 of the cage wheel 100 has ten plate-like cage wheel lugs 105. Are provided at equal intervals. Each cage wheel lug 105 is inclined so that the outer peripheral side end 105a side is positioned on the upstream side in the rotational direction when the traveling machine body 2 moves forward relative to the inner peripheral side end 105c side in a side view. In other words, each cage wheel lug 105 is inclined so as to be displaced upstream in the rotational direction when the traveling machine body 2 moves forward as it moves away from the rotation center of the rim portion 102 in a side view.

As shown in FIG. 10, each cage wheel lug 105 has a substantially S-shape when viewed from the side. The outer peripheral side end portion 105a of the cage wheel lug 105 is bent toward the rotation center side of the rim portion 102 with respect to the lug central portion 105b, and the inclination angle θa of the outer peripheral side end portion 105a is the inclination angle θb of the lug central portion 105b. Bigger than. Further, the inner peripheral side end portion 105c of the cage wheel lug 105 is bent to the opposite side to the rotation center of the rim portion 102 with respect to the lug central portion 105b, and the inclination angle θc of the inner peripheral side end portion 105c It is larger than the inclination angle θb of the central portion 105b. In this embodiment, the outer peripheral end 105a and the inner peripheral end 105c are provided in parallel in a side view, and the inclination angle θa of the outer peripheral end 105a and the inclination angle θc of the inner peripheral end 105c are the same. . Since the outer peripheral end 105a and the inner peripheral end 105c of the cage wheel lug 105 are bent, the strength of the cage wheel lug 105 can be improved.

As shown in FIG. 7, the cage wheel lug 105 is disposed away from the rear wheel 4. Thereby, a gap is provided between the rear wheel 4 and the cage wheel lug 105 (the cage wheel 100). Further, the width W ₁₀₀ of the cage wheel lug 105 is wider than the width W _{4 of the} rear wheel and the width W 120 of the inner auxiliary wheel 120 in the rotation axis direction of the wheels ₄ , ₁₀₀ , ₁₂₀ . The width _{W 120} of the inner auxiliary wheel 120 is narrower than the width _{W 4} of the rear wheels.

Further, in the rotation axis direction of the wheel 4,100,120, the width _{W 100} of the car wheel lug 105 is wider than the width _{W 120} of the width _{W 4} and inner auxiliary wheels 120 of the rear wheel 4 (Promotion lugs 92) Yes. The width _{W 120} of the inner auxiliary wheel 120 is narrower than the width _{W 4} of the rear wheels. In the rice transplanter 1 of this embodiment, the width W ₁₀₀ of the cage wheel lug 105 is at least twice the width W ₄ of the rear wheel, and is slightly wider than the seedling planting width Wp, as shown in FIG. Is set.

The outer diameter dimension D ₁₀₀ (which may be referred to as a diameter) of the cage wheel 100 is set smaller than the outer diameter dimension D ₄ of the rear wheel 4. That is, the cage wheel 100 is sized to fit on the inner diameter side of the rear wheel 4 in a side view. For this reason, the possibility that the car wheel 100 (particularly, the car wheel lug 105) may come into contact with the road surface during traveling on the road can be suppressed, and the traveling machine body 2 can smoothly travel on the road even when the car wheel 100 is attached. In this embodiment, outside dimension D ₁₂₀ of inner auxiliary wheel 120 is identical to the outer diameter D ₁₀₀ of the car wheel 100 can smoothly road in the traveling machine body 2 in a state of attaching the inner auxiliary wheels 120 .

As shown in FIG. 11, the positions of the rim portions 102 on the left and right basket wheels 100 are set so that the movement trajectory of each rim portion 102 does not overlap the location of each planting claw 30 of the seedling planting device 23. . In this embodiment, the position of the rim portion 102 in the cage wheel 100 is set so that the movement trajectories of the left and right rim portions 102 do not overlap with the first and eighth planting claws 30 from the left in plan view. The Thereby, it can suppress that the influence of the roughness of the field scene by each rim part 102 reaches the seedling planting attitude | position by the seedling planting apparatus 23 (each planting nail | claw 30). The plurality of basket wheel lugs 105 provided at appropriate intervals on the rim portion 90 do not roughen the farm scene so much that the movement trajectory of the cage wheel lugs 105 overlaps with the place of the planting claws 30 (planting position of the seedling). However, the seedling can be transplanted in a good planting posture only by the leveling action of the leveling rotor 85. In addition, the movement trajectories of the left and right rear wheels 4 and the inner auxiliary wheels 120 are also set so as not to overlap with the locations of the respective planting claws 30. The planting posture is suppressed.

FIG. 12 is a schematic diagram showing the movement trajectory of the cage wheel lug. FIG. 12 shows a movement locus of the car wheel lug 105 of the left car wheel 100 among the left and right car wheels 100 when the wheel 4 travels without slipping. When the cage wheel lug 105 enters the soil 141 in the field, the cage wheel lug 105 takes a substantially horizontal posture and firmly holds the soil 141 to generate a large buoyancy. Further, the cage wheel lug 105 assumes a substantially vertical posture when ascending, rises almost directly from the soil 141, and does not hold the soil 141.

The rice transplanter 1 of this embodiment includes a cage wheel 100 that is detachably attached to a rear wheel 4 as a traveling wheel, and the cage wheel 100 is appropriately arranged along an annular rim portion 102 and a circumferential direction of the rim portion 102. A plurality of basket wheel lugs 105 provided on the rim portion 102 at intervals are provided, and the cage wheel lugs 105 are upstream in the rotational direction when the traveling machine body 2 is advanced on the outer peripheral side end 105a side than on the inner peripheral side end 105c side. The outer end 105a of the cage wheel lug 105 is bent toward the center of rotation of the rim 102. As a result, when the cage wheel lug 105 enters the soil of the farm field, the angle θa1 (see FIG. 12) formed by the outer periphery side end portion 105a of the cage wheel lug 105 and the cultivator 142 becomes smaller (the outer periphery side end). Therefore, the basket wheel lug 105 is less likely to enter the cultivator 142 in the field and the cultivator 142 is less likely to be cut. Further, the cage wheel lug 105 has an outer peripheral side end portion 105a bent toward the center of rotation of the rim portion 102, so that when the cage wheel lug 105 is raised, the traveling wheel body 2 is placed on the downstream surface in the rotational direction when the traveling machine body 2 moves forward. It becomes difficult to hold the soil. For this reason, it is possible to avoid the risk that the traveling machine body 2 sinks in a deep field or a clay-like field, or that the traveling machine body 2 sinks by turning the tiller 142 when turning, and the traveling machine body 2 is capable of running through the wet field with a simple configuration. Can be greatly improved. Moreover, since the outer peripheral side end part 105a is bent, the strength of the cage wheel lug 105 can be improved.

By the way, when the rice transplanter 1 travels in the field, it moves like scooping the cultivator on the three sides constituted by the rear wheel 4, the rim portion 102 of the cage wheel 100, and the cage wheel lug 105. At this time, if the cage wheel lug 105 is connected to or close to the rear wheel 4, the tiller is scooped and mud adheres to the cage wheel lug 105 or the like. For such a malfunction, in the rice transplanter 1 of this embodiment, the cage wheel lug 105 is arranged away from the rear wheel 4 and the three sides are interrupted in the middle, so that the lifting of mud is small. Therefore, mud does not adhere easily, and mud adhering to the car wheel lug 105 becomes easy to fall, and mud does not easily accumulate on the car wheel lug 105, so that the car wheel 100 with good mud removal can be realized, and the traveling machine body 2. Improves wetland running ability.

Further, in the rotation axis direction of the wheel 4,100, the width _{W 100} of the car wheel lug 105 is wider than the width _{W 4} of the rear wheel 4, it is 2 times or more the width _{W 4} of the rear wheel 4 for example Since it is wider than the planting width Wp (see FIG. 11), the buoyancy generated by the cage wheel lug 105 is greatly increased, and the sinking of the traveling machine body 2 can be suppressed in deep fields or clay fields.

In addition, it is preferable that the outside protrusion width _Wo (refer FIG. 11) of the cage wheel 100 (cage wheel lug 105) with respect to the seedling planting position by the right and left outside planting claws 30 is narrower than the planting width Wp. Thereby, when the rice transplanter 1 reciprocates the field during the seedling planting operation, the basket wheel 100 (the cage wheel lug 105) can be prevented from stepping on the seedling of the adjacent strip already planted in the field. For example, when the seedling planting device 23 for six-row planting is connected to the traveling machine body 2 of the above embodiment, the outer protrusion width Wo of the cage wheel lug 105 of the cage wheel 100 attached to the left and right outside of the rear wheel 4 is: Compared with the connection of the seedling planting device 23 for eight-row planting, it becomes larger. In this case, the outer protrusion width Wo is set to a value at which the basket wheel lug 105 does not step on the adjacent seedling. For example, the cage wheel 100 having the cage wheel lug 105 having a narrower width W ₁₀₀ than the cage wheel lug 105 of the above embodiment is attached to the left and right rear wheels 4.

Further, the rear wheel 4 includes a plurality of propulsion lugs 92 arranged at appropriate intervals along the circumferential direction of the rear wheel 4, and the number of the car wheel lugs 105 and the number of the propulsion lugs 92 are different. And the phase of the propulsion lug 92 can be shifted, so that mud does not easily accumulate between the car wheel lug 105 and the rear wheel 4, and the wetland running ability of the traveling machine body 2 can be improved. Moreover, in this embodiment, since the number of the cage wheel lugs 105 is smaller than the number of the propulsion lugs 92, in the cage wheel 100, the interval between the cage wheel lugs 105 adjacent in the circumferential direction of the rim portion 102 can be increased. Further, it is possible to improve the sludge removal of the cage wheel 100 which is easier to hold mud than the rear wheel 4.

Moreover, since the cage wheel 100 is attached to the rear wheel 4 via the extension axle 110, the cage wheel 100 can be firmly attached to the rear wheel 4. In addition, the cage wheel 100 can be easily removed while being able to greatly improve the wettability of the traveling machine body 2. For example, when the rice transplanter 1 is mounted on a loading platform such as a truck, The rice transplanter 1 can be smoothly mounted without interfering with the tilt board or the ayumi board. Further, only the cage wheel 100 may be attached to the left and right outer sides of the rear wheel 4 without mounting the inner auxiliary wheel 120. For example, except for the rear wheel 4, the rear portion of the traveling machine body 2 can be supported only by the cage wheel 100 and the inner auxiliary wheel 120.

In this embodiment, as shown in FIG. 10, the inclination angle θb of the outer peripheral side end 105a of the cage wheel lug 105 and the inclination angle θc of the inner peripheral end 105c are the same, but the outer peripheral end 105a. The inclination angle θb of the inner peripheral side end portion 105c may be different from each other. Further, the inner peripheral side end portion 105 c may not be bent with respect to the lug center portion 105 b, or may be bent toward the rotation center side of the rim portion 102.

In this embodiment, the inclination angle θa of the outer peripheral side end portion 105a and the inclination angle θc of the inner peripheral side end portion 105c of the cage wheel lug 105 are equal to the inclination angle θd of the propulsion lug 92 of the rear wheel 4 (see FIG. 10). It may be larger than the tilt angle θd or less. In this embodiment, the inclination angle θb of the lug center portion 105b is smaller than the inclination angle θd of the propulsion lug 92, but may be equal to or more than the inclination angle θd.

Further, in this embodiment, the left and right inner auxiliary wheels 120 are provided in order to obtain the buoyancy and propulsive force of the traveling machine body 2 in a deep field or a clay field. Since the outer peripheral lug 125 of the inner auxiliary wheel 120 is smaller than the propulsion lug 92 of the rear wheel 4 and the cage wheel lug 105 of the cage wheel 100, the mud repellency inside the rear wheel 4 where mud tends to accumulate is ensured. is doing. In addition, the structure which removes the inner side auxiliary wheel 120 and arrange | positions the cage wheel 100 on the outer side of the rear wheel 4 may be sufficient.

The present invention is not limited to the above-described embodiment, and can be embodied in various forms. The configuration of each unit is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention. is there. For example, the present invention can be applied not only to a riding type rice transplanter but also to work vehicles such as various seedling transplanters that mainly work in paddy fields. Moreover, the variation of the front wheel 3 of the rice transplanter 1 can also be selected variously. For example, wide wheels may be used, or two normal front wheels 3 may be provided side by side on the left and right. Further, a dedicated cage wheel, for example, a cage wheel having the same configuration as the cage wheel 100 may be attached to the left and right outer sides of the front wheel 3 as the traveling wheel. In any case, the installation width with the field as the front wheel 3 can be expanded, which contributes to the improvement of wetland running ability.

1 Passenger rice transplanter (work vehicle)
2 traveling body 4 rear wheel (traveling wheel)
6 Mission case 37 Rear axle 37a Hexagonal shaft portion 92 Propulsion lug 100 Basket wheel 102 Rim portion 105 Basket wheel lug 105a Outer peripheral end of cage wheel lug

Claims

In a work vehicle including a traveling wheel that supports a traveling machine body,
A basket wheel detachably attached to the traveling wheel;
The cage wheel includes an annular rim portion and a plurality of cage wheel lugs provided on the rim portion at appropriate intervals along the circumferential direction of the rim portion,
The basket wheel lug is inclined so that the outer peripheral side end side is located on the upstream side in the rotational direction when the traveling machine body is moving forward than the inner peripheral side end side in the side view,
The outer peripheral side end portion of the basket wheel lug is bent toward the rotation center side of the rim portion,
Work vehicle.
The basket wheel lug is disposed apart from the traveling wheel,
The work vehicle according to claim 1.
In the direction of the rotation axis of the traveling wheel, the width of the car wheel lug is wider than the width of the traveling wheel.
The work vehicle according to claim 1.