JP6726089B2 - Work vehicle - Google Patents

Description

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

Some of the riding type rice transplanters of recent years have wheels additionally arranged in order to improve running performance in the field. For example, in the riding type rice transplanter described in Patent Document 1, auxiliary wheels that rotate integrally with the rear wheels are provided on the left and right inner sides or both the left and right sides of the rear wheels to improve the wetland running performance of the traveling machine body.

JP-A-7-329503

However, depending on the shape of the lugs of the auxiliary wheels, the lugs plunge into the cultivator in the field, and the lugs hold soil, which causes a problem that the traveling performance of the traveling aircraft is deteriorated. Passenger-type rice transplanters, which are an example of work vehicles, have the problem that the traveling vehicle sinks in a deep field or a clay field, or the traveling vehicle sinks when the turntable is broken when turning, which is a further issue from the market. It is required to improve the wetland running performance.

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

A working vehicle of the present invention is a working vehicle including a pair of front wheels and a pair of traveling wheels that support a traveling body, and includes auxiliary wheels that are detachably attached to the traveling wheels, and the auxiliary wheels are annular. A rim portion and a plurality of auxiliary wheel lugs provided on the rim portion at appropriate intervals along the circumferential direction of the rim portion are provided, and the auxiliary wheel lug has an outer peripheral end portion side being an inner peripheral end in a side view. Is inclined so as to be positioned on the upstream side in the rotational direction when the traveling machine body is moving forward rather than on the part side, and the outer peripheral side end of the auxiliary wheel lug is positioned to the outermost side in the radial direction of the auxiliary wheel. In addition, it is bent toward the center of rotation of the rim portion.

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

Further, in the work vehicle of the present invention, the width of the auxiliary wheel lug may be larger than the width of the traveling wheel in the rotation axis direction of the traveling wheel.

Working vehicle of the present invention includes an auxiliary wheel removably attached to the traveling wheel, the auxiliary wheel, an annular rim portion, provided in the rim portion at appropriate intervals along the circumferential direction of the rim portion A plurality of auxiliary wheel lugs, the auxiliary wheel lug is inclined so that the outer peripheral side end side is located more upstream than the inner peripheral side end side in the rotational direction during forward traveling of the traveling machine body in a side view. Therefore, the outer peripheral side end portion of the auxiliary wheel lug is bent toward the rotation center side of the rim portion to the extent that it is located on the outermost side in the radial direction of the auxiliary wheel . As a result, the angle formed by the outer peripheral side end of the auxiliary wheel lug and the cultivator in the field becomes smaller, so that the auxiliary wheel lug does not easily enter the cultivator in the field and also makes it difficult to cut the cultivator. Further, the auxiliary wheel lug has an outer peripheral side end bent toward the rotation center side of the rim portion, so that when the auxiliary wheel lug rises, it is difficult to hold soil on the surface on the downstream side in the rotation direction when the traveling machine body advances. Become. For this reason, it is possible to avoid the possibility that the traveling vehicle will sink in deep fields or clayey fields, or the traveling vehicle may sink due to the cultivator being destroyed when turning, and with a simple configuration, drastic improvement of running ability of the traveling vehicle in wetlands Can be achieved. Further, since the outer peripheral side end portion of the auxiliary wheel lug is bent, the strength of the auxiliary wheel lug can be improved.

In the work vehicle of the present invention, if the auxiliary wheel lugs are arranged so as to be separated from the traveling wheels, mud is less likely to attach because the lifting of the mud is less, and the auxiliary wheel lugs are attached to the auxiliary wheel lugs. Since the mud easily falls and the mud is less likely to accumulate on the auxiliary wheel lugs, it is possible to realize an auxiliary wheel with good mud removal and improve the wetland running performance of the traveling vehicle.

Further, in the work vehicle of the present invention, when the width of the auxiliary wheel lug is made wider than the width of the traveling wheel in the rotation axis direction of the traveling wheel, the buoyancy generated by the auxiliary wheel lug is significantly increased. Therefore, the sinking of the traveling body can be suppressed in a deep field or a clay field.

It is a left side 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 side view showing an engine, a mission case, a rear axle case, and the like. FIG. 3 is a plan view showing an engine, a mission case, a rear axle case, and the like. It is a drive system diagram of a riding type rice transplanter. It is a left side view of a basket wheel, a rear wheel, and an inside auxiliary wheel. It is sectional drawing in the AA line position of FIG. 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 side view which expands and shows a basket wheel and a rear wheel. It is a top view which shows the positional relationship of a basket wheel and a planting nail. It is a schematic diagram which shows the movement locus of a basket wheel lug.

Hereinafter, an embodiment in which the present invention is embodied will be described with reference to the drawings when applied to an eight-row planting type riding 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. 1 to 4. The rice transplanter 1 of the embodiment includes a traveling machine body 2 supported by a pair of left and right front wheels 3 as traveling wheels and a pair of left and right rear wheels 4 similarly. An engine 5 is mounted on the front part of the traveling machine body 2. The traveling machine body 2 is configured to travel forward and backward by transmitting power from the engine 5 to the rear transmission case 6 and driving the front wheels 3 and the rear wheels 4. A front axle case 7 is projected to the left and right sides of the mission case 6, and a front wheel 3 is steerably attached to a front axle 36 extending outward from the front axle case 7 in the left and right directions. The tubular frame 8 is projected to the rear of the mission case 6, the rear axle case 9 is fixedly mounted on the rear end side of the tubular frame 8, and the rear wheel 4 is attached to the rear axle 37 that extends outward from the rear axle case 9 in the left and right directions. ing.

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

Further, on the driving operation unit 13 on the rear upper surface side of the front bonnet 11, there are provided a steering handle 14, a traveling main speed change lever (not shown), and a work lever 16 as a lifting operation tool. A control seat 18 is arranged behind the front bonnet 11 on the upper surface of the work step 10 via a seat frame 17. In addition, on the left and right sides of the front bonnet 11, left and right preliminary seedling mounts 24 are provided with the work step 10 interposed therebetween.

A link frame 19 is erected at the rear end of the traveling machine body 2. A seedling planting device 23 for eight-row planting is connected to the link frame 19 via a lifting link mechanism 22 composed of a lower link 20 and a top link 21 so as to be liftable. 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 the hitch bracket 38 to the rear side of the elevating link mechanism 22, the seedling planting device 23 is arranged in the rear of the traveling machine body 2 so that it can be moved up and down. The rear end of the upper surface of the tubular frame 8 supports a cylinder base end side of a hydraulic lifting cylinder 39 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 the elevating cylinder 39 expanding and contracting to vertically rotate the elevating link mechanism 22, the seedling planting device 23 moves up and down. The seedling planting device 23 is configured to be rotatable around the rolling fulcrum axis so that the tilted posture in the left-right direction can be changed.

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 machine 23 to plant the seedlings in the field while moving in the field by a driving operation. Perform work (rice planting work). During the seedling planting operation, the seedling planting device 23 is supplied with an operator's seedling mat on the spare seedling mounting table 24 at any time.

As shown in FIG. 1 and FIG. 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 for eight rows connected to the planting input case 26. (One set of two articles) planted transmission cases 27, seedling planting mechanism 28 provided on the rear end side of each planted transmission cases 27, seedling mounting table 29 for eight-row planting, and each planted transmission case 27. And a float 32 for leveling the farm scene, which is arranged on the lower surface side of the. The seedling planting mechanism 28 is provided with a rotary case 31 having two planting claws 30 for one row. Two cases of rotary cases 31 are arranged in the planted transmission case 27. By one rotation of the rotary case 31, the two planting claws 30 cut out and grab the seedlings of each plant, and plant the seedlings in the field scene prepared by the float 32. On the front side of the seedling planting device 23, a leveling rotor 85 for leveling (leveling) the field scene is provided so that it can be moved up and down.

Although details will be described later, the power from the engine 5 via the mission 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 mission case 6 toward the seedling planting device 23 is once transmitted to the inter-plant gear shift case 75 provided on the upper right side of the rear axle case 9, and then from the inter-plant gear shift case 75 to the planting input case 26. It The seedling planting mechanism 28 and the seedling placing table 29 are driven by the transmitted power. The inter-plant speed change case 75 has a built-in inter-plant speed change mechanism 76 for switching between planted seedlings, for example, sparse planting, standard planting, or dense planting, and a planting clutch 77 for interrupting power transmission to the planting plant 23. (See FIG. 5).

Side markers 33 are provided on the left and right outside of the seedling planting device 23. The side marker 33 has a marker wheel body 34 for muscle pulling, and a marker arm 35 that rotatably supports the marker wheel body 34. The base end side of each marker arm 35 is pivotally supported on the left and right outside of the seedling planting device 23 so as to be rotatable left and right. The side marker 33 is based on the operation of the work lever 16 provided in the driving operation unit 13, a work posture in which a reference trajectory in the next process is landed and formed in the field scene, and the marker wheel 34 is raised to raise the field scene. It is configured to be rotatable in a non-working posture separated from.

As shown in FIGS. 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 the laterally-long horizontal intermediate coupling frame 53. The front ends of the pair of left and right front frames 51 are welded and fixed to the front frame 54. The rear end sides of the pair of 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 coupling frame 53 are each formed in a rectangular frame shape in a plan view. Similarly, the intermediate connecting frame 53, the left and right rear frames 52, and the rear frame 55 are also formed in a rectangular 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 U-shaped shape so as to be positioned lower than the left and right front frames 51. The left and right ends of each base frame 56 are welded and fixed to the corresponding front frame 51. The engine 5 is mounted on and supported by the front and rear base frames 56 via a substantially flat engine base 57 and a plurality of anti-vibration rubbers (not shown). The rear base frame 56 is connected to the front portion of the mission case 6 via a rear relay bracket 60.

As can be seen from FIG. 4, the rear parts of the left and right front frames 51 are connected to the front axle case 7 protruding to the left and right sides of the mission case 6. The left and right ends of a U-shaped frame 61 extending obliquely downward and rearward in a side view are fixed to the center of the intermediate coupling frame 53 by welding. An intermediate portion of the U-shaped frame 61 is connected to an intermediate portion of the tubular frame 8 that connects the mission case 6 and the rear axle case 9 (see FIGS. 3 and 4). The upper ends of the left and right vertical frames 62 are welded and fixed to the middle portion of the rear frame 55. To the lower ends of the left and right vertical frames 62, the middle portions of the left and right lateral rear axle support frames 63 are welded and fixed. The left and right ends of the rear axle support frame 63 are connected to the rear axle case 9. A muffler 65 that reduces exhaust noise of the engine 5 is disposed below the step support base 64 that projects 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 arranged behind the engine 5. Although not described in detail, the handle shaft is rotatably arranged inside the handle post that is erected on the upper surface of the power steering unit 66. The steering handle 14 is fixed to the upper end side of the handle shaft. A steering output shaft (not shown) projects downward from the lower surface of the power steering unit 66. Steering rods 68 (see FIG. 4) for steering the left and right front wheels 3 are connected to the steering output shafts.

The engine 5 of the embodiment is arranged on the intermediate portion of the front and rear base frames 56 with the output shaft 70 (crank shaft) oriented in the left-right direction. The left and right widths of the engine 5 and the engine base 57 are smaller than the inner dimension between the left and right front frames 51, and the lower side of the engine 5 and the engine base 57 are arranged on the intermediate portions 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 at a position overlapping the left and right front frames 51 in a side view. An exhaust pipe 69 that communicates with an exhaust system of the engine 5 is arranged on one left and right side surfaces (the left side surface in the embodiment) of the engine 5. The base end side of the exhaust pipe 69 is connected to each cylinder of the engine 5, and the tip 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 projects outward from the left and right side surfaces of the engine 5. An engine output pulley 72 is provided on a projecting end portion of the output shaft 70 projecting from the left side surface of the engine 5, and a mission input pulley 73 is provided on a mission input shaft 71 projecting leftward from the mission case 6 and transmitted to both pulleys 72, 73. I am wearing a belt. Power is transmitted from the engine 5 to the transmission case 6 via both pulleys 72, 73 and the transmission belt.

In the mission case 6, the hydraulic continuously variable transmission 40 including the hydraulic pump 40a and the hydraulic motor 40b, the planetary gear device 41, the hydraulic continuously variable transmission 40, and the transmission power via the planetary gear device 41 are shifted in multiple stages. A gear type auxiliary transmission mechanism 42, a main clutch 43 for connecting and disconnecting power transmission from the planetary gear unit 41 to the gear type auxiliary transmission mechanism 42, a traveling brake 44 for braking output from the gear type auxiliary transmission mechanism 42, and the like. ing. The hydraulic pump 40a is driven by the power from the mission input shaft 71, the hydraulic oil is supplied from the hydraulic pump 40a to the hydraulic motor 40b, and the shift power is output from the hydraulic motor 40b. The speed change power of the hydraulic motor 40b is transmitted to the gear type auxiliary speed change mechanism 42 via the planetary gear unit 41 and the main clutch 43. Then, from the gear type auxiliary transmission mechanism 42, power is transmitted by branching in two directions of the front and rear wheels 3, 4 and the seedling planting device 23.

A part of the branch power toward the front and rear wheels 3 and 4 is transmitted from the gear type auxiliary transmission mechanism 42 to the front axle 36 of the front axle case 7 via the differential gear mechanism 45 to drive the front left and right wheels 3 to rotate. .. The rest of the branch power toward the front and rear wheels 3, 4 is transmitted from the gear type auxiliary transmission mechanism 42 via a universal joint shaft 46, a 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. Is transmitted to the rear axle 37 of the rear axle case 9 to rotate the left and right rear wheels 4. When the traveling brake 44 is actuated, the output from the gear type auxiliary transmission mechanism 42 disappears, so that the front and rear wheels 3 and 4 are braked. When the rice transplanter 1 is turned, the friction clutch 48 on the inside of the turn in the rear axle case 9 is disengaged to freely rotate the rear wheel 4 on the inside of the turn, and the rear wheel 4 on the outside of the turn to which power is transmitted is rotated. It turns by driving.

Inside the rear axle case 9, there is provided a rotor drive unit 86 having a leveling rotor clutch for connecting/disconnecting power to the leveling rotor 85. The power transmitted from the gear type auxiliary transmission 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. By rotating the leveling rotor 85, the field scene is leveled.

The branch power toward the seedling planting device 23 is transmitted to the inter-plant shift case 75 via the PTO transmission shaft mechanism 74 with the universal joint shaft. In the inter-plant speed change case 75, an inter-plant speed change mechanism 76 for switching between the plants of the seedlings to be planted, for example, sparse planting, standard planting or dense planting, and a planting clutch 77 for interrupting power transmission to the planting plant 23 are provided. I have it. The power transmitted to the inter-stock transmission case 75 is transmitted to the planted input case 26 via the inter-stock transmission mechanism 76, the planted clutch 77 and the universal joint shaft 78.

Inside the planting input case 26, a lateral feeding mechanism 79 for laterally moving the seedling table, a vertical seedling mechanism 80 for vertically transporting the seedling mat on the seedling table 29, and the planting input case 26 are provided. A planted output shaft 81 for transmitting power to the planted transmission case 27 is provided. The lateral feed mechanism 79 and the vertical seedling feed mechanism 80 are driven by the power transmitted to the planted input case 26 to continuously and reciprocally move the seedling placement table 29 in a reciprocating manner. The seedling mat on the seedling mounting table 29 is intermittently vertically fed when it reaches the reciprocating turning point). The power from the planted input case 26 via the planted output shaft 81 is transmitted to each planted transmission case 27, and rotationally drives the rotary case 31 and the planted claw 30 of each planted transmission case 27. When a fertilizer application device is provided, power is transmitted from the inter-stock shift case 75 to the fertilizer application device.

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

The left and right inner auxiliary wheels 120 have a hub tubular portion 121 located at the center of rotation, an annular rim portion 122, and a spoke portion 123 extending radially from the hub tubular portion 121 and connecting the hub tubular portion 121 and the rim portion 122. It has and. A rubber ring body 124 and a plurality of projecting outer peripheral lugs 125 are formed on the rim portion 122 by baking hard rubber around the rim portion 122. The front side (left and right outer side) of the rear axle 37 has a hexagonal shaft shape, and the hub tubular portion 121 of the inner auxiliary wheel 120 is fitted to the hexagonal shaft portion 37 a of the rear axle 37.

The left and right rear wheels 4 include a hub tubular portion 93 located at the center of rotation, an annular rim portion 90, and a spoke portion 94 that radially extends from the hub tubular portion 93 and connects the hub tubular portion 93 and the rim portion 90. A reinforcing plate portion 95 welded to the hub cylinder portion 93 and the spoke portion 94 is provided. A rubber ring 91, a plurality of plate-shaped propulsion lugs 92, and a plurality of protrusion-shaped outer peripheral lugs 96 are formed on the rim portion 90 by baking hard rubber around the rim portion 90. The propulsion lugs 92 are formed on the rubber ring body 91 at appropriate intervals along the circumferential direction of the rubber ring body 91. In addition, each of the propulsion lugs 92 is inclined so that the outer peripheral side end side is located more upstream than the inner peripheral side end side in the rotational direction when the traveling machine body 2 advances when viewed from the side. In other words, each of the propulsion lugs 92 is inclined so as to be displaced toward the upstream side in the direction of rotation of the traveling machine body 2 when moving forward as the distance from the center of rotation of the rim portion 90 increases in a side view. In this embodiment, eleven 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 onto 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 tubular spacer member 126 is also fitted to the hexagonal shaft portion 37 a between the hub tubular portion 121 of the inner auxiliary wheel 120 and the hub tubular 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 that the spacer member 126 and the hub cylinder portion 121 of the inner auxiliary wheel 120 can be removed. Is also held by the hexagonal shaft portion 37a of the rear axle 37 so as not to come off. 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 tip end surface of the hexagonal shaft portion 37a of the rear axle 37 with a bolt 134.

Extension axles 110 are 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 bolted to the reinforcing plate portion 95, an extension axle portion 112 projecting 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 axle. Three rib portions 113 welded to the base end of the portion 112 are provided. The extension axle portion 112 is arranged on the same axis as the rear axle 37. The extension shaft portion 112 has a hexagonal shaft portion 112a having a hexagonal shaft shape on the tip side (on the left and right outer sides).

A basket wheel 100 is detachably attached to each rear wheel 4 via an extension axle 110. Each basket wheel 100 has a hub tubular portion 101 located at the center of rotation, an annular rim portion 102, and four spoke portions that radially extend from the hub tubular portion 101 and connect the hub tubular portion 101 and the rim portion 102. 103, four reinforcing plate portions 104 welded to the hub cylinder portion 101 and the spoke portions 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 basket wheel 100 is fitted on the tip side 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 stop pin 136 so as not to come off. It should be noted that a plurality of holes into which the lock pin shafts 135 can be inserted are formed side by side in the axial direction at the tip end side portion of the hexagonal shaft portion 112a. By appropriately selecting the holes into which the lock pin shafts 135 are inserted, The position of the basket wheel 100 with respect to the wheel 4 in the axial direction is selectable.

In this embodiment, the number of the basket 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 basket wheel 100 has ten plate-shaped basket wheel lugs 105. Are provided at equal intervals. Each basket wheel lug 105 is inclined so that the outer peripheral side end portion 105a side is located on the upstream side in the rotational direction when the traveling machine body 2 is forwarded from the inner peripheral side end portion 105c side in a side view. In other words, each of the basket wheel lugs 105 is inclined so as to be displaced toward the upstream side in the rotational direction when the traveling machine body 2 is moving forward as the distance from the rotation center of the rim portion 102 increases in a side view.

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

As shown in FIG. 7, the basket wheel lug 105 is arranged apart from the rear wheel 4. As a result, a gap is provided between the rear wheel 4 and the basket wheel lug 105 (the basket wheel 100). Further, the width W ₁₀₀ of the basket 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, the width W ₁₀₀ of the basket wheel lug 105 becomes wider than the width W ₄ of the rear wheel 4 (the propulsion lug 92) and the width W 120 of the inner auxiliary wheel 120 in the rotation axis direction of the wheels 4, ₁₀₀ , _120. There is. 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 basket wheel lug 105 is twice or more the width W ₄ of the rear wheel, and is slightly wider than the planting width Wp of the seedlings, as shown in FIG. 11. It is set.

An outer diameter dimension D ₁₀₀ (may be called a diameter) of the basket wheel 100 is set smaller than an outer diameter dimension D ₄ of the rear wheel 4. That is, the basket wheel 100 is sized to fit inside the rear wheel 4 in a side view. Therefore, it is possible to suppress the risk that the basket wheels 100 (particularly the basket wheel lugs 105) come into contact with the traveling road surface during traveling on the road, and the traveling machine body 2 can smoothly travel on the road even with the basket wheels 100 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 rims 102 of the left and right basket wheels 100 are set so that the movement trajectory of each rim 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 of the basket wheel 100 is set so that the movement loci of the left and right rim portions 102 do not overlap the first and eighth planting claws 30 from the left in plan view. It As a result, it is possible to suppress the influence of the roughening of the field scene by each rim portion 102 on the seedling planting posture by the seedling planting device 23 (each planting claw 30). In addition, since the plurality of basket wheel lugs 105 provided at appropriate intervals on the rim portion 90 do not roughen the field scene so much, the movement trajectory of the basket wheel lugs 105 overlaps with the location of the planting claw 30 (planting location of seedlings). Even so, the seedlings can be transplanted in a good planting posture only by the grounding action of the grounding rotor 85. Further, the movement loci of the left and right rear wheels 4 and the inner auxiliary wheels 120 are also set so as not to overlap the locations of the planting claws 30. It suppresses reaching the planting posture.

FIG. 12 is a schematic diagram showing the movement trajectory of the basket wheel lug. FIG. 12 shows the movement trajectory of the basket wheel lug 105 of the left basket wheel 100 of the left and right basket wheels 100 when the wheels 4 travel without slipping. When the basket wheel lug 105 enters the soil 141 in the field, the basket wheel lug 105 is in a substantially horizontal posture to firmly hold the soil 141 and generate a large buoyancy. Further, the basket wheel lug 105 is in a substantially vertical posture when rising, and rises almost directly above the soil 141 and does not hold the soil 141.

The rice transplanter 1 of this embodiment includes a basket wheel 100 detachably attached to the rear wheel 4 as a traveling wheel, and the basket wheel 100 is an annular rim portion 102 and a circumferential direction of the rim portion 102 as appropriate. A plurality of basket wheel lugs 105 provided on the rim portion 102 at intervals are provided, and the basket wheel lug 105 has an outer peripheral side end portion 105a side that is an upstream side in a rotation direction when the traveling machine body 2 is forward than a inner peripheral side end portion 105c side. The basket wheel lug 105 has an outer peripheral end 105a that is bent toward the center of rotation of the rim portion 102. As a result, when the basket wheel lug 105 enters the soil of the field, the angle θa1 (see FIG. 12) formed by the outer peripheral side end 105a of the basket wheel lug 105 and the cultivator 142 becomes smaller (outer peripheral side end). Since the portion 105a is at the lying angle, the basket wheel lug 105 is unlikely to enter the cultivator 142 in the field and is difficult to cut the cultivator 142. Further, the basket wheel lug 105 has an outer peripheral side end portion 105a that is bent toward the rotation center side of the rim portion 102, so that when the basket wheel lug 105 is raised, it is provided on the surface on the downstream side in the rotation direction when the traveling machine body 2 advances. It becomes difficult to hold the soil. Therefore, it is possible to avoid the possibility that the traveling machine body 2 sinks in a deep field or a clayey field or the traveling machine body 2 sinks by breaking the cultivator 142 during turning, and the traveling field 2 of the traveling machine body 2 can be easily traversed. Can be significantly improved. Moreover, since the outer peripheral end 105a of the basket wheel lug 105 is bent, the strength of the basket wheel lug 105 can be improved.

By the way, when the rice transplanter 1 travels in the field, the rear wheels 4, the rim portion 102 of the basket wheel 100, and the basket wheel lugs 105 make a motion of scooping the tiller. At this time, if the basket wheel lug 105 is connected to or close to the rear wheel 4, the cultivator is scooped and mud adheres to the basket wheel lug 105 or the like. In order to cope with such a problem, in the rice transplanter 1 of this embodiment, the basket wheel lug 105 is arranged apart from the rear wheel 4 and the above three sides are interrupted in the middle, so that the lifting of mud is reduced. Therefore, it becomes difficult for the mud to adhere, and because the mud adhered to the basket wheel lug 105 easily falls and the mud does not easily accumulate on the basket wheel lug 105, it is possible to realize the basket wheel 100 with good mud removal and the traveling machine body. The wetland running performance of No. 2 can be improved.

Further, the width W ₁₀₀ of the basket wheel lug 105 is wider than the width W ₄ of the rear wheel 4 in the rotation axis direction of the wheels 4, ₁₀₀ , and is, for example, twice or more the width W ₄ of the rear wheel 4. Since it is wider than the planting width Wp (see FIG. 11), the buoyancy generated by the basket wheel lug 105 is significantly increased, and the sinking of the traveling machine body 2 can be suppressed in a deep field or a clay field.

In addition, it is preferable that the outer protrusion width W _o (see FIG. 11) of the basket wheel 100 (the basket wheel lug 105) with respect to the seedling planting position by the planting claws 30 on the left and right outer sides is narrower than the planting width Wp. Thereby, when the rice transplanter 1 reciprocates in the field during the seedling planting operation, the basket wheel 100 (the basket wheel lug 105) can be prevented from stepping on the seedlings of the adjacent strips already planted in the field. For example, when the seedling planting device 23 for 6-row planting is connected to the traveling machine body 2 of the above-described embodiment, the outer protruding width Wo of the basket wheel lug 105 of the basket wheel 100 mounted on the left and right outer sides of the rear wheel 4 is: It becomes larger than when the seedling planting device 23 for eight-row planting is connected. In this case, the outer protruding width Wo is set to a value such that the basket wheel lug 105 does not step on the adjacent seedlings. For example, car wheel 100 having a width W ₁₀₀ is narrow cage wheel lug 105 than to the car wheel lug 105 of the above embodiment is attached to the rear wheels 4 of the right and left.

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 basket wheel lugs 105 and the number of the propulsion lugs 92 are different, so the basket wheel lugs 105. Can be deviated from the phase of the propulsion lug 92, mud is less likely to accumulate between the basket wheel lug 105 and the rear wheel 4, and the wetland running performance of the traveling vehicle body 2 can be improved. Further, in this embodiment, since the number of the basket wheel lugs 105 is smaller than the number of the propulsion lugs 92, in the basket wheel 100, the interval between the basket wheel lugs 105 adjacent to each other in the circumferential direction of the rim portion 102 can be increased. Therefore, it is possible to favorably remove mud from the basket wheel 100, which is more likely to hold mud than the rear wheels 4.

Further, since the basket wheel 100 is attached to the rear wheel 4 via the extension axle 110, the basket wheel 100 can be firmly attached to the rear wheel 4. In addition, the basket wheel 100 can significantly remove the wetland running performance of the traveling machine body 2, but can be easily removed. Therefore, for example, when the rice transplanter 1 is mounted on a luggage carrier such as a truck and transported, The rice transplanter 1 can be smoothly mounted without interfering with the tilting board and the ayumi board. Alternatively, only the basket wheel 100 may be attached to the left and right outer sides of the rear wheel 4 without mounting the inner auxiliary wheel 120. Further, for example, the rear wheel 4 may be excluded, and the rear portion of the traveling machine body 2 may be supported only by the basket wheel 100 and the inner auxiliary wheel 120.

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

Further, in this embodiment, the inclination angle θa of the outer peripheral side end portion 105a of the basket wheel lug 105 and the inclination angle θc of the inner peripheral side end portion 105c are the inclination angle θd of the propulsion lug 92 of the rear wheel 4 (see FIG. 10). However, the inclination angle may be less than or equal to θd. Further, in this embodiment, the inclination angle θb of the lug central portion 105b is smaller than the inclination angle θd of the propulsion lug 92, but may be equal to or larger 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 basket wheel lug 105 of the basket wheel 100, the mud-repelling property inside the rear wheel 4 where mud is likely to accumulate is secured. doing. The inner auxiliary wheel 120 may be removed and the basket wheel 100 may be arranged outside the rear wheel 4.

The present invention is not limited to the above-described embodiment and can be embodied in various aspects, and the configuration of each part 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 is not limited to being applied to a riding-type rice transplanter, but is also applicable to work vehicles such as various seedling transplanters that mainly work in paddy fields. Further, various variations of the front wheels 3 of the rice transplanter 1 can be selected. For example, a wide wheel may be used, or two normal front wheels 3 may be provided side by side on the left and right. Further, dedicated basket wheels, for example, basket wheels having the same configuration as the basket wheel 100 may be attached to the left and right outer sides of the front wheels 3 as the traveling wheels. In either case, the installation width of the front wheel 3 in the field can be increased, which contributes to improvement of wetland running performance.

1 Passenger rice transplanter (work vehicle)
2 Traveling vehicle 4 Rear wheels (running wheels)
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 side end portion of the basket wheel lug

Claims (3)

In a work vehicle including traveling wheels that support a traveling body,
An auxiliary wheel detachably attached to the traveling wheel is provided,
The auxiliary wheel includes an annular rim portion and a plurality of auxiliary wheel lugs provided on the rim portion at appropriate intervals along the circumferential direction of the rim portion,
The auxiliary wheel lug is, in a side view, inclined so that the outer peripheral side end side is located on the upstream side in the rotational direction during forward traveling of the traveling machine body from the inner peripheral side end side,
The outer peripheral side end portion of the auxiliary wheel lug is bent toward the rotation center side of the rim portion to the extent that it is located on the outermost side in the radial direction of the auxiliary wheel ,
Work vehicle. The auxiliary wheel lug is arranged apart from the traveling wheel,
The work vehicle according to claim 1. In the rotation axis direction of the traveling wheel, the width of the auxiliary wheel lug is wider than the width of the traveling wheel,
The work vehicle according to claim 1.

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