TWI663906B - Work vehicle - Google Patents

Abstract

The problem of the present invention is to improve the paddy field walking performance of a traveling body with a simple structure.

The work vehicle includes: a traveling wheel that supports the traveling body; and a cage wheel that is detachably mounted on the traveling wheel. The cage wheel includes: a ring-shaped rim portion; and a plurality of cage wheel projections, which are provided on the rim portion at appropriate intervals along the circumferential direction of the rim portion. The cage wheel protrusion is inclined so that the outer peripheral side end portion side is located closer to the upstream side in the rotation direction when the traveling body moves forward than the inner peripheral side end portion side in a side view. The outer peripheral end portion of the cage wheel protruding portion is bent toward the rotation center side of the rim portion.

Description

Work vehicle

The present invention relates to, for example, a ride-on rice transplanter for agricultural work, and is mainly used for a work vehicle for agricultural work.

In recent years, there have been ride-on rice transplanters in which wheels are additionally arranged in order to improve the migration performance on farmland. For example, the riding rice transplanter described in Patent Document 1 is provided with auxiliary wheels that rotate integrally with the rear wheels on the left and right or left and right sides of the rear wheels to improve the paddy field performance of the traveling body.

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 7-329503

However, depending on the shape of the lugs of the auxiliary wheels, there is a problem that the protrusions may entrain soil due to the protrusions being inserted into the plow floor of the farmland, which may cause the degradation of the paddy field ’s walking performance. As an example of a working vehicle, a riding rice transplanter has the problem that the traveling body subsides in deep farmland or clay farmland, or the plough bottom is destroyed during rotation, which causes the subsiding of the traveling body. The market requires further improvement of the paddy field walking performance. .

The present invention has been made in view of the foregoing circumstances, and has made it a technical problem to further improve the paddy field walking performance of a traveling body with a simple structure.

The working vehicle of the present invention is provided with a pair of front wheels and a pair of traveling wheels that support a traveling body, and includes a cage wheel detachably mounted on the traveling wheel. The annular rim portion and a plurality of cage wheel protrusions are provided on the rim portion at appropriate intervals along the circumferential direction of the rim portion, and the cage type The wheel projection is inclined such that the outer peripheral side end portion side is located closer to the upstream side in the rotation direction when the traveling body moves forward than the inner peripheral side end side when viewed from the side. The cage wheel projection is at the outer peripheral end. The part is bent toward the center of rotation of the rim part.

In the work vehicle of the present invention, the cage wheel protrusion may be disposed separately from the traveling wheel.

In addition, the working vehicle of the present invention may be in a direction of a rotation axis of the traveling wheel, and a width of the cage wheel protrusion is wider than a width of the traveling wheel.

The work vehicle of the present invention includes a cage wheel that is detachably mounted on the traveling wheel. The cage wheel includes a ring-shaped rim portion and a plurality of cage wheel projections. The cage wheels The protrusions are provided on the rim portion at appropriate intervals along the circumferential direction of the rim portion, and the cage wheel protrusion portion is positioned more on the outer peripheral side end portion side than on the inner peripheral side end portion side when viewed from the side. By tilting the upstream side of the moving body in the forward direction when the traveling body advances, the outer peripheral end portion of the cage wheel protruding portion is bent toward the center of rotation of the rim portion. As a result, the angle formed by the outer peripheral end of the cage wheel protrusion and the plow floor of the farmland becomes smaller, so that the cage wheel projection becomes difficult to insert into the farmland plow floor, and becomes difficult to cut. Plow the ground floor. In addition, the cage wheel protruding portion is bent toward the center of rotation of the rim portion due to the outer peripheral end portion. Therefore, when the cage wheel protruding portion rises, it becomes difficult to carry soil to the forward rotation of the traveling body. Direction face on the downstream side. Therefore, it is possible to avoid the possibility of the mobile body sinking in deeper farmland or clay-like farmland or to damage the plough floor during rotation to cause the mobile body to sink, and a significant improvement in the paddy walking performance of the mobile body with a simple structure can be sought. In addition, since the end portion of the cage wheel protrusion is curved, the strength of the cage wheel protrusion can be increased.

In the work vehicle of the present invention, as long as the cage wheel protrusions are arranged separately from the traveling wheels, the mud is less likely to be brought up, so the mud is less likely to adhere, and the cage wheels are attached The mud of the protruding part becomes easy to fall, and the mud becomes difficult to accumulate on the protruding part of the cage wheel. Therefore, a cage wheel with good mud-falling property can be realized, and the paddy field running performance of the traveling body can be improved.

Moreover, as long as the working vehicle of the present invention is set in the direction of the rotation axis of the traveling wheel, the width of the cage wheel protrusion is wider than the width of the traveling wheel. It will increase greatly, so it can restrain the migrating body from sinking in deeper farmland or clay farmland.

1‧‧‧ (Riding type as working vehicle) Rice transplanter

2‧‧‧ mobile body

3‧‧‧ front wheels

4‧‧‧ (as a moving wheel) rear wheel

5‧‧‧ Engine

6‧‧‧ gearbox

7‧‧‧ front axle housing

8‧‧‧ tubular frame

9‧‧‧ rear axle housing

10‧‧‧ (as the body shell)

11‧‧‧ front hood

12‧‧‧shift shift pedal

13‧‧‧Driving Operation Department

14‧‧‧handle

16‧‧‧Joystick

17‧‧‧ seat frame

18‧‧‧Control seat

19‧‧‧ connecting rod frame

20‧‧‧ lower link

21‧‧‧ Upper Link

22‧‧‧ Lifting link mechanism

23‧‧‧8 rows seedling transplanting device

24‧‧‧ Spare seedling stand

25‧‧‧Get on and off pedals

26‧‧‧ Planting input box

27‧‧‧ Planting transmission box

28‧‧‧ Transplanting agency

29‧‧‧ (for eight-row planting) seedling mounting platform

30‧‧‧ Planting claws

31‧‧‧rotating box

32‧‧‧ floating body

33‧‧‧Side Marker

34‧‧‧Marker wheel body

35‧‧‧marker arm

36‧‧‧ front axle

37‧‧‧ rear axle

37a, 112a‧‧‧Hex shaft

38‧‧‧Mounting bracket

39‧‧‧lifting cylinder

40‧‧‧Hydraulic stepless speed changer

40a‧‧‧Hydraulic pump

40b‧‧‧hydraulic motor

41‧‧‧ planetary gear device

42‧‧‧Gear-type auxiliary transmission

43‧‧‧Main clutch

44‧‧‧Transfer brake

45‧‧‧ Differential gear mechanism

46, 78, 87‧‧‧‧ universal joint shaft

47‧‧‧ rear drive shaft

48‧‧‧ Friction clutch

49‧‧‧ gear transmission

50‧‧‧frame

51‧‧‧ front frame

52‧‧‧ rear frame

53‧‧‧ intermediate link frame

54‧‧‧ Front Frame

55‧‧‧ post frame

56‧‧‧ Underframe

57‧‧‧Engine

60‧‧‧ Rear Relay Bracket

61‧‧‧U-shaped frame

62‧‧‧Vertical Frame

63‧‧‧ rear axle support frame

64‧‧‧Step board support

65‧‧‧ Silencer

66‧‧‧Power Steering Unit

68‧‧‧Steering lever

69‧‧‧Exhaust pipe

70‧‧‧ output shaft

71‧‧‧ variable speed input shaft

72‧‧‧engine output wheel

73‧‧‧ Variable input wheel

74‧‧‧PTO drive shaft mechanism

75‧‧‧strain

76‧‧‧strain distance transmission mechanism

77‧‧‧ Planting clutch

79‧‧‧ lateral feed mechanism

80‧‧‧ Seedling vertical feeding mechanism

81‧‧‧ Planting output shaft

85‧‧‧ ground preparation rotor

86‧‧‧Rotor drive unit

90, 102, 122‧‧‧‧rim

91, 124‧‧‧ rubber wheel

92‧‧‧ advance projection

93, 101, 121‧‧‧ Hub

94, 103, 123‧‧‧ spokes

95, 104‧‧‧ Reinforcement Board Department

96, 125‧‧‧ peripheral protrusion

100‧‧‧ Cage Wheel

105‧‧‧ cage wheel protrusion

105a‧‧‧ (outside the cage wheel projection)

105b‧‧‧ projection center

105c‧‧‧Inner peripheral side end

110‧‧‧Extended axle

111‧‧‧ flange

112‧‧‧Extended axle section

113‧‧‧ rib

120‧‧‧Inside auxiliary wheel

126‧‧‧ Spacer

131, 135‧‧‧Lock pin

132, 136‧‧‧ stop pin

133‧‧‧washer

134‧‧‧Bolt

141‧‧‧ soil

142‧‧‧ Plow bottom

D ₄ ‧‧‧ diameter of rear wheel

D ₁₀₀ ‧‧‧ Cage Wheel Diameter

D ₁₂₀ ‧‧‧ Outer dimension of inner auxiliary wheel

W ₄ ‧‧‧ Wheel width

W ₁₀₀ ‧‧‧Width of cage wheel protrusion

W ₁₂₀ ‧‧‧Width of inner auxiliary wheels

W _o ‧‧‧outer protrusion width

Wp‧‧‧Planting width

θa, θb, θc, θd‧‧‧ tilt angle

θa1‧‧‧angle

Fig. 1 is a left side view of the riding rice transplanter of the embodiment.

Fig. 2 is a top view of the riding rice transplanter.

FIG. 3 is a left side view showing an engine, a transmission, a rear axle housing, and the like.

FIG. 4 is a plan view showing an engine, a transmission, a rear axle housing, and the like.

Fig. 5 is a driving system diagram of a riding rice transplanter.

Figure 6 is a left side view of the cage wheel, rear wheel and inner auxiliary wheel.

Fig. 7 is a sectional view taken along the line A-A in Fig. 6;

FIG. 8 is a perspective view of a cage wheel, a rear wheel, and an inner auxiliary wheel.

FIG. 9 is an exploded perspective view of a cage wheel, a rear wheel, and an inner auxiliary wheel.

FIG. 10 is an enlarged left side view of a cage wheel and a rear wheel.

11 is a plan view showing a positional relationship between a cage wheel and a planting claw.

FIG. 12 is a schematic diagram showing a movement trajectory of a projection of a cage wheel.

Hereinafter, an embodiment of the present invention will be described based on a drawing when it is applied to an 8-row transplant-type ride-on rice transplanter 1 (hereinafter, simply referred to as a rice transplanter 1). Furthermore, in the following description, the left side toward the traveling direction of the traveling body 2 is simply referred to as the left side, and the right side toward the same traveling direction is simply referred to as the right side.

First, the outline of the rice transplanter 1 is demonstrated, referring FIGS. 1-4. The rice transplanter 1 according to the embodiment is provided with a traveling body 2 supported by a pair of left and right front wheels 3 as the traveling wheels and the same pair of left and right rear wheels 4. An engine 5 is mounted on the front of the traveling body 2. It is configured to transmit power from the engine 5 to the rear gearbox 6 and drive the front wheels 3 and the rear wheels 4 to move the traveling body 2 forward and backward. The front axle housing 7 is protruded toward the left and right sides of the gearbox 6, and the front wheels 3 are steerably mounted on the front axle 36 extending from the front axle housing 7 in the left-right outward direction. The cylindrical frame 8 is protruded toward the rear of the gearbox 6, and a rear axle case 9 is fixedly installed on the rear end side of the cylindrical frame 8. The rear wheels 4 are installed from the rear axle case 9 to the left and right and outward. After extending the axle 37.

As shown in FIGS. 1 and 2, on the upper surface side of the front portion and the central portion of the traveling body 2, a work pedal portion (vehicle casing) 10 for an operator to ride is provided. A front hood 11 is disposed above the front portion of the work pedal portion 10, and an engine 5 is disposed inside the front hood 11. On the upper surface of the work pedal portion 10, on the lateral side of the rear portion of the front hood 11, a shifting pedal 12 for pedal operation is arranged. Although the details are omitted, the rice transplanter 1 of the embodiment is configured to adjust the output of the hydraulic stepless speed changer 40 from the gearbox 6 by the drive of a variable speed electric motor corresponding to the amount of depression of the shifting speed pedal 12. Variable speed power.

In addition, the driving operation portion 13 located on the upper surface side of the rear portion of the front hood 11 is provided with a handle 14, a shift main shift lever (not shown), and a work lever 16 as a lifting operation tool. An operation seat 18 is disposed behind the front hood 11 in the upper surface of the work pedal portion 10 via a seat frame 17. In addition, on the left and right sides of the front hood 11, left and right spare seedling placement tables 24 are provided across the work pedal portion 10.

A link frame 19 is provided upright at the rear end of the traveling body 2. A seedling transplanting device 23 for 8 rows of transplants is connected to the link frame 19 via a lifting link mechanism 22 composed of a lower link 20 and an upper link 21 so as to be able to move up and down. In this case, a hitch bracket 38 is provided on the front surface side of the seedling transplanting device 23 via a rotation fulcrum axis (not shown). By connecting the hanging bracket 38 to the rear side of the elevating link mechanism 22, the seedling transplanting device 23 can be arranged behind the traveling body 2 so as to be able to move up and down. The cylinder base end side of the hydraulic lifting cylinder 39 is supported on the rear portion of the upper surface of the cylindrical frame 8 so as to be able to rotate up and down. The rod front end side of the lift cylinder 39 is connected to the lower link 20. The lifting link mechanism 22 is rotated up and down by the telescopic movement of the lifting cylinder 39, and as a result, the seedling transplanting device 23 moves up and down. In addition, the seedling transplanting device 23 is configured to be capable of changing the tilt posture in the left-right direction by rotating around the rotation fulcrum axis.

The operator gets on the work pedal section 10 from the side of the work pedal section 10 and gets on the work pedal section 10, and while driving in the farmland by driving operation, drives the seedling transplanting device 23 to execute the seedling transplanting. The rice planting operation (rice transplanting operation) will be carried out. In addition, during the transplanting operation, the operator supplements the seedling transplanting device 23 with a seedling mat on the standby seedling mounting table 24 at any time.

As shown in FIG. 1 and FIG. 2, the seedling transplanting device 23 is provided with: a planting input box 26 that transmits power from the engine 5 through the gearbox 6; four rows of eight rows (one in two rows) The planting transmission box 27 is connected to the planting input box 26; the rice transplanting mechanism 28 is arranged at the rear side of each planting transmission box 27; the seedling mounting table 29 for eight rows of planting; and the floating surface for leveling The bodies 32 are arranged on the lower surface side of each planting transmission case 27. A row of rotary boxes 31 having two planting claws 30 is provided on the rice transplanting mechanism 28. A rotary box 31 for two rows is arranged in the planting transmission box 27. By rotating the rotary box 31 once, the two planting claws 30 are respectively cut off and grasped the seedlings of each plant, and are planted on the field surface prepared by the floating body 32. On the front surface side of the seedling transplanting device 23, a leveling rotor 85 for flattening (leveling) the field surface is provided so as to be movable up and down.

Although the details will be described later, the power from the engine 5 through the transmission 6 is transmitted not only to the front wheels 3 and the rear wheels 4 but also to the planting input box 26 of the seedling planting device 23. In this case, the power from the gearbox 6 toward the seedling transplanting device 23 is first transmitted to the plant distance transmission 75 provided on the upper right side of the rear axle housing 9, and the power is further transmitted from the plant distance transmission 75 to the planting input. Box 26. Each seedling transplanting mechanism 28 or seedling mounting table 29 is driven by the transmitted power. Built into the plant-spacing transmission 75 is a plant-spacing transmission mechanism 76 that switches the plant spacing of the seedlings to be planted to, for example, sparse planting, standard planting or dense planting; and a planting clutch 77 that will plant the planting plant 23 Power transmission is turned on and off (see Fig. 5).

Furthermore, lateral markers 33 are provided on the left and right outer sides of the seedling transplanting device 23. The side marker 33 includes a marker wheel body 34 for scribing, 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 outer sides of the seedling transplanting device 23 so as to be capable of rotating left and right. The side marking device 33 is composed of a working posture that can be turned to form a trajectory that is used as a reference for the next step according to the operation of the operating lever 16 located in the driving operation portion 13 and a wheel body of the marking device. 34 ascending and leaving the field in a non-operational position.

As shown in FIGS. 3 and 4, the traveling body 2 is provided with a pair of left and right body frames 50 extending forward and backward. Each body frame 50 is divided into two parts: 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 intermediate connection frame 53 in the left and right lateral directions. 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 formed in a rectangular 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 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 underframes 56. The middle portion of each chassis 56 is formed in a U-shaped shape so as to be located lower than the left and right front frames 51. The left and right ends of each chassis 56 are fixed to the corresponding front frame 51 by welding. The engine 5 is mounted on the front and rear underframes 56 via a substantially flat plate-shaped engine bed 57 and a plurality of anti-vibration rubbers (not shown). The rear chassis 56 is connected to the front of the transmission 6 via a 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 the front axle housing 7 protruding toward the left and right sides of the gearbox 6. On the center side of the intermediate connection frame 53, left and right ends of the U-shaped frame 61 extending diagonally rearward and downward in a side view are fixed by welding. The middle portion of the U-shaped frame 61 is connected to the middle portion of the cylindrical frame 8 connecting the transmission case 6 and the rear axle housing 9 (see FIGS. 3 and 4). Upper end sides of the left and right vertical frames 62 are welded and fixed to a middle portion of the rear frame 55. On the lower end sides of the left and right vertical frames 62, the middle portion of the left and right horizontally long rear axle support frames 63 is welded and fixed. Both left and right ends of the rear axle support frame 63 are connected to the rear axle case 9. Furthermore, a muffler 65 for reducing the exhaust sound of the engine 5 is disposed below the footboard support base 64 protruding outward from the left front frame 51.

As shown in FIGS. 3 and 4, a power steering unit 66 is provided at the front of the transmission 6 disposed behind the engine 5. Although details are omitted, a handle shaft is rotatably disposed inside a handle post that is erected on the upper surface of the power steering unit 66. An operating 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. Steering levers 68 (see FIG. 4) for steering the left and right front wheels 3 are respectively connected to the steering output shafts.

The engine 5 according to the embodiment has the output shaft 70 (crank shaft) oriented in the left-right direction and is disposed on the middle portion of the front and rear underframes 56. 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. The lower side of the engine 5 and the engine stand 57 are arranged on the middle portion of the front and rear underframes 56. The lower side is exposed from the left and right front frames 51. In this case, the output shaft 70 (axis line) of the engine 5 is positioned to overlap the left and right front frames 51 when viewed from the side. On the left and right side surfaces (left side surface in the embodiment) of the engine 5, there are arranged exhaust pipes 69 that communicate with the exhaust system of the engine 5. The base end side of the exhaust pipe 69 is connected to each cylinder of the engine 5, and the front 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 is demonstrated, referring FIG. 5. FIG. The output shaft 70 of the engine 5 projects outward from the left and right sides of the engine 5. An engine output wheel 72 is provided on the protruding end of the output shaft 70 protruding from the left side of the engine 5, and a speed change input wheel 73 is provided on the speed change input shaft 71 protruding from the gearbox 6 to the left and outside, and is wound and transmitted on the two wheels 72 and 73. Leather belt. Power is transmitted from the engine 5 to the transmission 6 via two wheels 72 and 73 and a transmission belt.

The transmission 6 is provided with a hydraulic stepless speed changer 40 composed of a hydraulic pump 40a and a hydraulic motor 40b, a planetary gear device 41, and a speed change via the hydraulic stepless speed changer 40 and the planetary gear device 41. Gear-type auxiliary transmission mechanism 42 in which power is shifted into a plurality of stages, a main clutch 43 that switches power transmission from planetary gear device 41 to gear-type auxiliary transmission mechanism 42, and brakes output from the gear-type auxiliary transmission mechanism 42 The shift brakes 44 and so on. The hydraulic pump 40a is driven by the power from the variable speed input shaft 71, and the hydraulic oil is supplied from the hydraulic pump 40a to the hydraulic motor 40b, so that the variable speed power is output from the hydraulic motor 40b. The transmission power train of the hydraulic motor 40 b is transmitted to the gear-type auxiliary transmission mechanism 42 via the planetary gear device 41 and the main clutch 43. In addition, the power self-gear-type auxiliary transmission mechanism 42 is transmitted branched in both directions of the front and rear wheels 3 and 4 and the seedling transplanting device 23.

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 housing 7 via the differential gear mechanism 45, and the left and right front wheels 3 are rotationally driven. The remainder of the branch power toward the front and rear wheels 3, 4 is from the gear-type auxiliary transmission mechanism 42 via the universal joint shaft 46, the rear drive shaft 9, the drive shaft 47, the left and right friction clutches 48, and the gear-type transmission mechanism 49. It is transmitted to the axle 37 behind the rear axle housing 9, and the left and right rear wheels 4 are rotationally driven. When the traveling brake 44 is actuated, the output from the gear-type auxiliary transmission mechanism 42 disappears, so the front and rear wheels 3 and 4 are braked together. When the rice transplanter 1 is rotated, the friction clutch 48 on the inside of the rotation inside the rear axle housing 9 is cut off to rotate the wheel 4 after the inside of the rotation, and the wheel behind the outside is rotated by the power transmission. The rotation drive of 4 makes the rotation.

A rotor drive unit 86 is provided in the rear axle housing 9. The rotor drive unit 86 includes a ground preparation rotor clutch for turning on and off the power to the ground preparation rotor 85. The power of the self-gear type auxiliary transmission mechanism 42 is transmitted to the universal joint shaft 46, and is also branched and transmitted to the rotor drive unit 86. The power is transmitted from the rotor drive unit 86 to the ground preparation rotor 85 via the universal joint shaft 87. The field surface is leveled by the rotational driving of the ground preparation rotor 85.

The branch power system toward the seedling transplanting device 23 is transmitted to the plant distance transmission 75 via a power take-off (PTO) drive shaft mechanism 74 with a universal joint shaft. In the plant distance transmission 75 are provided: a plant distance transmission mechanism 76 that switches the plant distance of the seedlings to be transplanted to, for example, sparse planting, standard planting or dense planting; and a planting clutch 77 that will plant the planting plant 23 The power transmission is switched on and off. The power train transmitted to the plant distance transmission 75 is transmitted to the plant input box 26 via the plant distance transmission mechanism 76, the planting clutch 77, and the universal joint shaft 78.

Inside the planting input box 26 are provided: a lateral feeding mechanism 79 that moves the seedling mounting table laterally; a seedling longitudinal feeding mechanism 80 that feeds the seedling pads on the seedling mounting table 29 longitudinally; and The planting output shaft 81 transmits power from the planting input box 26 to each planting transmission box 27. The lateral feeding mechanism 79 and the seedling longitudinal feeding mechanism 80 are driven by the power transmitted to the planting input box 26, so that the seedling placing table 29 is continuously and reciprocally moved laterally, and the seedling placing table 29 reaches the back and forth At the moving end (the turning point of the reciprocating movement), the seedling pads on the seedling mounting table 29 are intermittently fed and conveyed longitudinally. The self-planting input box 26 is transmitted to each planting transmission box 27 through the power system of the planting output shaft 81, and the rotation box 31 and the planting claw 30 of each planting transmission box 27 are rotationally driven. When a fertilizing device is installed, the power is transmitted from the plant-to-plant transmission 75 to the fertilizing device.

Next, the detailed structure of the cage wheel 100, the rear wheel 4 and the inner auxiliary wheel 120 as the traveling wheels will be described with reference to FIGS. 1, 4, and 6 below. In the rice transplanter 1 of this embodiment, the inner auxiliary wheels 120, the rear wheels 4, and the cage wheels 100 are sequentially arranged from the left and right inner sides.

The left and right inner auxiliary wheels 120 include a hub tube portion 121 located at the center of rotation, an annular flange portion 122, and a spoke portion 123 extending radially from the hub tube portion 121 and extending the hub tube portion 121. Connected to the rim portion 122. At the rim portion 122, a rubber wheel body 124 and a plurality of protrusion-shaped outer peripheral protrusions 125 are formed by hard rubber being fired around. The front end side (left and right outer sides) of the rear axle 37 has a hexagonal shaft shape, and the hexagonal shaft portion 37 a of the rear axle 37 covers the hub cylindrical portion 121 fitted with the inner auxiliary wheel 120.

The left and right rear wheels 4 are provided with a hub tube portion 93 located at the center of rotation; an annular rim portion 90; and a spoke portion 94 extending radially from the hub tube portion 93 and connecting the hub tube portion 93 and the rim The parts 90 are connected; and the reinforcing plate part 95 is welded to the hub barrel part 93 and the spoke part 94. At the rim portion 90, a rubber wheel body 91, a plurality of plate-shaped plurality of pushing protrusions 92, and a plurality of protrusion-shaped plurality of peripheral protrusions 96 are formed by hard rubber being fired around. Each of the pushing protrusions 92 is formed in the rubber wheel body 91 at appropriate intervals along the circumferential direction of the rubber wheel body 91. Further, each of the propulsion projections 92 is inclined such that the outer peripheral side end portion side is located closer to the upstream side in the rotation direction when the traveling body 2 moves forward than the inner peripheral side end portion side in a side view. In other words, each of the pushing protrusions 92 is inclined so as to shift toward the upstream side in the rotation direction when the traveling body 2 moves forward as it moves away from the center of rotation of the rim portion 90 when viewed from the side. In this embodiment, the eleven pushing protrusions 92 are arranged on the rubber wheel body 91 at regular intervals.

The hub tube portion 93 of the rear wheel 4 is positioned further outside than the hub tube portion 121 of the inner auxiliary wheel 120, and is covered and fitted to the hexagonal shaft portion 37 a of the rear axle 37. A cylindrical spacer member 126 is also fitted to the hexagonal shaft portion 37 a between the hub cylindrical portion 121 of the inner auxiliary wheel 120 and the hub cylindrical portion 93 of the rear wheel 4. The hub cylindrical portion 93 of the rear wheel 4 is fixed to the hexagonal shaft portion 37a of the rear axle 37 with the lock pin 131 and the stop pin 132 incapable of falling off, so that the spacer member 126 and the hub cylindrical portion 121 of the inner auxiliary wheel 120 cannot be used. The hexagonal shaft portion 37 a of the rear axle 37 is detachably held. A washer 133 having a larger diameter than the inner diameter of the hub cylindrical portion 93 of the rear wheel 4 is fixed to the front end surface of the hexagonal shaft portion 37a of the rear axle 37 by a bolt 134.

On the left and right outer sides of the reinforcing plate portion 95 of each of the rear wheels 4, an extension axle 110 is fastened by bolts. The extension axle 110 is provided with a flange portion 111 that is bolted to the reinforcing plate portion 95, an extension axle portion 112 that is centrally provided on the left and right outer side surfaces of the flange portion 111, and three ribs 113 , Etc. are welded to the left and right outer sides of the flange portion 111 and the base end portion of the extension axle portion 112. The extended axle portion 112 is disposed on the same axis as the rear axle 37. The hexagonal shaft portion 112 a in the shape of a hexagonal shaft is formed on the front end side (left and right outer sides) of the extended axle portion 112.

Cage wheels 100 are detachably attached to each rear wheel 4 via an extension axle 110. Each cage wheel 100 is provided with a hub tube portion 101 located at the center of rotation; an annular rim portion 102; and four spoke portions 103 extending radially from the hub tube portion 101 and having the hub tube portion 101 Connected to the rim part 102; 4 patches The strong plate portion 104 is welded to the hub barrel portion 101 and the spoke portion 103; and a plurality of cage wheel protrusions 105 are provided at the rim portion at appropriate intervals along the circumferential direction of the rim portion 102. 102.

The hub tube portion 101 of the cage wheel 100 covers a portion fitted on the front end side of the hexagonal shaft portion 112 a of the extension axle 110. The hub tube 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 be able to fall off. In addition, a plurality of holes through which the locking pin 135 can be inserted are formed in an axial arrangement at the front end portion of the hexagonal shaft portion 112a, and can be selected by appropriately selecting the holes into which the locking pin 135 is inserted. The position of the cage wheel 100 with respect to the rear wheel 4 in the axial direction.

In this embodiment, the number of the cage wheel protrusions 105 is different from the number (11) of the propulsion protrusions 92 of the rear wheel 4, and 10 is provided at regular intervals on the rim portion 102 of the cage wheel 100. Plate-shaped cage wheel protrusions 105. Each cage wheel protrusion 105 is inclined so that the outer peripheral side end 105a side is located closer to the upstream side in the direction of rotation when the traveling body 2 moves forward than the inner peripheral side end portion 105c side when viewed from the side. In other words, each cage wheel protrusion 105 is inclined so as to shift toward the upstream side in the rotation direction when the traveling body 2 moves forward as it moves away from the center of rotation of the rim portion 102 when viewed from the side. As shown in FIG. 6, the outer peripheral end portion 105 a of the cage wheel protruding portion 105 is provided at a distance from the rim portion 102, and is arranged at the outermost portion in the radial direction of the cage wheel 100. position.

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

As shown in FIG. 7, the cage wheel protrusion 105 is disposed separately from the rear wheel 4. Thereby, a gap is provided between the rear wheel 4 and the cage wheel protrusion 105 (cage wheel 100). Further, in the rotation axis direction of the wheel 4,100,120, the cage portion 105 of the wheel after the projection width W ₁₀₀ than the width W ₄ of the wheel and an inner width 120 of the auxiliary wheel width W is _120. Furthermore, the width W _{120 of the} inner auxiliary wheel 120 is narrower than the width W _{4 of the} rear wheel.

Further, in the rotation axis direction of the wheel 4,100,120, the cage wheel width 105 of the projecting portion ₁₀₀ than the rear wheel W 4 (advancing projection 92) of the width W and the inner width W _{4 120} 120 of the auxiliary wheel width. Furthermore, the width W _{120 of the} inner auxiliary wheel 120 is narrower than the width W _{4 of the} rear wheel. In the rice transplanter 1 of this embodiment, the width W ₁₀₀ of the cage wheel protrusion 105 is more than twice the width W ₄ of the rear wheel, and as shown in FIG. 11, it is set to be slightly larger than the planting of the seedling. The width Wp is wide.

An outer diameter dimension D ₁₀₀ (also referred to as a diameter) of the cage wheel 100 is set to be smaller than an outer diameter dimension D _{4 of the} rear wheel ₄ . That is, the cage wheel 100 has a size that can be received on the inner diameter side of the rear wheel 4 when viewed from the side. Therefore, the possibility that the cage wheel 100 (especially the cage wheel protrusion 105) comes into contact with the road surface when traveling on the road can be suppressed, and the movement can be performed even when the cage wheel 100 is installed The body 2 moves smoothly on the road. Furthermore, in this embodiment, the outer diameter D _{120 of the} inner auxiliary wheel 120 is the same as the outer diameter D _{100 of the} cage wheel 100, and the moving body can be moved even when the inner auxiliary wheel 120 is installed. 2Move smoothly on the road.

As shown in FIG. 11, the positions of the rim portions 102 of the left and right cage wheels 100 are set such that the movement trajectories of the rim portions 102 do not overlap the positions of the planting claws 30 of the seedling planting device 23. In this embodiment, the position of the rim portion 102 of the cage wheel 100 is set such that the movement trajectories of the left and right rim portions 102 do not overlap the first and eighth insertion claws 30 from the left when viewed in plan. Thereby, it is possible to suppress a situation where the field surface is damaged by the rim portions 102 and the influence on the planting posture of the seedlings by the seedling planting device 23 (each planting claw 30) can be suppressed. Furthermore, since the plurality of cage wheel protrusions 105 provided on the rim portion 90 at appropriate intervals do not excessively damage the field surface, even if the movement track of the cage wheel protrusion 105 and the planting claw 30 The parts (planting positions of the seedlings) overlap, and the seedlings can also be transplanted in a good planting position only by using the ground preparation action of the ground preparation rotor 85. In addition, the movement trajectories of the wheels 4 and the inner auxiliary wheels 120 after being left and right are not overlapped with the positions of the planting claws 30, and the field surface damage caused by the rear wheels 4 and the inner auxiliary wheels 120 is suppressed, which affects the seedling Situation of planting posture.

FIG. 12 is a schematic diagram showing a movement trajectory of a projection of a cage wheel. FIG. 12 shows the movement trajectory of the cage wheel protrusion 105 of the left cage wheel 100 among the left and right cage wheels 100 when the wheel 4 moves without slipping. When the cage wheel protruding portion 105 enters the soil 141 in the farmland, the cage wheel protruding portion 105 assumes a substantially horizontal posture and firmly squeezes the soil 141 to generate a large buoyancy. In addition, the cage wheel protruding portion 105 assumes a substantially vertical posture when rising, and rises from the soil 141 toward almost immediately above without entraining the soil 141.

The rice transplanter 1 of this embodiment includes a cage wheel 100 that is detachably attached to the rear wheel 4 as a traveling wheel. The cage wheel 100 includes a ring-shaped rim portion 102 and a circumference along the rim portion 102. A plurality of cage wheel protrusions 105 are provided on the rim portion 102 at appropriate intervals in the direction. The cage wheel protrusions 105 are located on the outer peripheral end portion 105a side of the traveling body 2 more than the inner peripheral end portion 105c side. The forward rotation direction is inclined on the upstream side, and the outer peripheral end portion 105 a of the cage wheel protruding portion 105 is bent toward the rotation center side of the rim portion 102. As a result, when the cage wheel protrusion 105 is to enter the soil of the farmland, the angle θa1 (see FIG. 12) formed by the outer peripheral end portion 105a of the cage wheel protrusion 105 and the plow floor 142 becomes even greater. It is small (becomes the angle at which the outer peripheral side end portion 105a falls), and therefore, the cage wheel protrusion 105 is not easily inserted into the plow floor 142 of the farmland and it is difficult to cut the plow floor 142. In addition, the cage wheel projection 105 is bent toward the center of rotation of the rim portion 102 because the outer peripheral end portion 105a is bent. Therefore, when the cage wheel projection 105 is raised, it is difficult to carry the soil to the advance of the traveling body 2 The surface on the downstream side of the direction of rotation. Therefore, it is possible to avoid the possibility of the mobile body 2 sinking in deeper farmland or clay farmland or to damage the plow bottom layer 142 during the rotation to cause the mobile body 2 to sink, and a simple structure can be used to seek the paddy field walking of the mobile body 2 Significant performance improvements. In addition, since the cage wheel protrusion 105 is bent at the outer peripheral side end portion 105a, the strength of the cage wheel protrusion 105 can be increased.

However, if the rice transplanter 1 moves in the farmland, it will become a shovel bottom by using three sides composed of the rear wheel 4, the rim portion 102 of the cage wheel 100, and the cage wheel protrusion 105. Action. At this time, if the cage wheel protrusion 105 is connected to or close to the rear wheel 4, the plough floor will be shoveled, and dirt will adhere to the cage wheel protrusion 105 and the like. In response to such a problem, in the rice transplanter 1 of this embodiment, the cage wheel protrusions 105 are arranged separately from the rear wheels 4 and the three sides are interrupted on the way, so that the carry-over of soil is reduced. Therefore, the dirt is not easy to adhere, and because the dirt attached to the cage wheel protrusion 105 is easy to fall, so that the dirt is not easily accumulated on the cage wheel protrusion 105, the cage wheel 100 having good mud-falling property can be realized, and It can improve the paddy walking performance of the mobile body 2.

In the direction of the rotation axis of the wheels 4 and _100, the width W _{100 of the} cage wheel protrusion 105 is wider than the width W ₄ of the rear wheel 4, for example, it is twice or more than the width W ₄ of the rear wheel 4, and The width is wider than the planting width Wp (see FIG. 11), so the buoyancy generated by the cage wheel protrusion 105 is greatly increased, and the subsidence of the moving body 2 in deeper farmland or clay farmland can be suppressed.

The cage wheel 100 (cage wheel projection 105) has a width W _o (refer to FIG. 11) that is narrower than the planting width Wp with respect to the planting position of the planting claws 30 on the left and right outer sides. . Thereby, when the rice transplanter 1 moves back and forth in the field during the seedling transplanting operation, the cage wheel 100 (cage wheel protruding part 105) can be prevented from stepping on the seedlings that have been planted on adjacent rows of the field . For example, in a case where the seedling transplanting device 23 for 6-row transplanting is connected to the traveling body 2 of the above-mentioned embodiment, the cage wheel protrusions of the cage wheels 100 mounted on the left and right outer sides of the rear wheel 4 are installed. The projecting width W _{o on} the outer side of 105 is larger than when the seedling transplanting device 23 for 8-row transplanting is connected. In this case, the outer protrusion width W _o is set to a value such that the cage wheel protrusions 105 do not step on the seedlings on the adjacent rows. For example, a cage wheel ₁₀₀ having a cage wheel protrusion 105 having a width W ₁₀₀ narrower than that of the cage wheel protrusion 105 of the above embodiment is mounted on the left and right rear wheels 4.

In addition, the rear wheel 4 includes a plurality of propulsion projections 92 arranged at appropriate intervals along the circumferential direction of the rear wheel 4. Since the number of the cage wheel projections 105 and the number of the projection projections 92 are different, it is possible to The phase of the cage wheel protrusion 105 and the phase of the propulsion protrusion 92 are staggered, so that it is difficult for dirt to accumulate between the cage wheel protrusion 105 and the rear wheel 4, which can improve the paddy walking performance of the traveling body 2. Further, in this embodiment, since the number of the cage wheel projections 105 is smaller than the number of the projection protrusions 92, the cage wheel 100 can be widened adjacent to the circumferential direction of the rim portion 102. The cage wheel protrusions 105 are spaced apart from each other, so that the soil of the cage wheel 100 which is easier to entrain dirt in the rear wheel 4 can be improved.

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, since the cage wheel 100 is capable of greatly improving the paddy field running performance of the traveling body 2 and can be easily removed, for example, when the rice transplanter 1 is carried on a stage such as a truck, it can be dispensed with. The left and right inclined boards or spring boards interfere with the rice transplanter 1 to be smoothly mounted. In addition, the inner auxiliary wheels 120 may not be installed, and only the cage wheels 100 may be installed on the left and right outer sides of the rear wheels 4. For example, in addition to the rear wheels 4, only the cage wheels 100 and the inner auxiliary wheels 120 may be used to support the rear portion of the traveling body 2.

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

Moreover, in this embodiment, although the inclination angle θa of the outer peripheral side end portion 105a of the cage wheel protruding portion 105 and the inclination angle θc of the inner peripheral side end portion 105c are larger than the inclination angle of the propulsion protruding portion 92 of the rear wheel 4 θd (see FIG. 10), but may be equal to or less than the inclination angle θd. In this embodiment, although the inclination angle θb of the central portion 105b of the protruding portion is smaller than the inclination angle θd of the protruded protruding portion 92, it may be an inclination angle. Degree θd or more.

Further, in this embodiment, the left and right inner auxiliary wheels 120 are provided in order to obtain the buoyancy and the propulsive force of the traveling body 2 in a deeper farmland or a clay farmland. The outer peripheral protrusions 125 of the inner auxiliary wheel 120 are smaller than the propulsion protrusions 92 of the rear wheels 4 or the cage wheel protrusions 105 of the cage wheels 100, so it is possible to ensure that the inside of the wheels 4 after the mud is easily accumulated Desmutting. Further, a configuration in which the cage wheel 100 is disposed outside the rear wheel 4 in order to remove the inner auxiliary wheel 120 may be used.

The present invention is not limited to the aforementioned embodiments, and may be embodied in various aspects. The configuration of each part is not limited to the illustrated embodiment, and various changes can be made without departing from the spirit of the present invention. For example, the present invention is not limited to being applied to ride-on rice transplanters, but can also be applied to working vehicles such as various seedling transplanters that mainly operate in paddy fields. In addition, variations of the wheels 3 before the rice transplanter 1 may be selected. For example, it may be a wide wheel, or two general front wheels 3 may be arranged on each side. In addition, dedicated cage wheels, such as cage wheels having the same configuration as the cage wheel 100, may be mounted on the left and right outer sides of the wheel 3 before the traveling wheels. With this, it is possible to expand the setting range of the farmland as the front wheel 3, and contribute to the improvement of the paddy field walking performance.

Claims (3)

A working vehicle is provided with a traveling wheel supporting a traveling body. The operating vehicle is provided with a cage wheel detachably mounted on the traveling wheel. The cage wheel is provided with an annular rim portion and a plurality of cage wheels. Projections, the plurality of cage wheel projections are provided on the rim portion at appropriate intervals along the circumferential direction of the rim portion, and the cage wheel projections are provided at the outer peripheral side ends when viewed from the side. The side of the cage wheel is inclined closer to the upstream side of the rotation direction of the traveling body than the inner peripheral end side, and the outer peripheral end of the cage wheel projection is bent toward the center of rotation of the rim portion. The outer peripheral side end portion is provided at a distance from the rim portion, and is disposed at an outermost position in a radial direction of the cage wheel. The work vehicle according to claim 1, wherein the cage wheel protrusion is disposed separately from the traveling wheel. For example, the working vehicle of claim 1 or 2, wherein the width of the protruding portion of the cage wheel is wider than the width of the moving wheel in the rotation axis direction of the moving wheel.