JP3520125B2 - Agricultural wheels - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called rubber-baked wheel (agricultural wheel) and is used as a traveling device for paddy field working machines such as riding rice transplanters and flooded direct seeders.

[0002]

2. Description of the Related Art An elastic ring body having an annular rim as a core and the entire rim covered with an elastic material is provided on the elastic ring body.
Plate-shaped blade lugs protruding in the radial direction and the axial direction are integrally provided with a circumferential interval, and a trapezoidal lug is integrally provided on the outer peripheral portion of the elastic ring body between the blade lugs. Agricultural wheels used are, for example, Japanese Utility Model Laid-Open No. 57-29401.
It is known from Japanese Utility Model Publication No. 1-14481 and is widely used as a traveling device for paddy working machines.

In the above-mentioned agricultural wheels, the diameter of the elastic wheel body (maximum width portion / tire width) was 30 to 40 mm, but the tire width was 50 due to the deluxeization of rice transplanters in recent years.
The width has been widened to ~ 60 mm, which improves the appearance of this machine (rice transplanter), increases the ground contact area, and lowers the ground contact pressure. Therefore, the adaptability to Fukada (footstep settlement 30 to 40 cm) is also good. Met.

[0004]

Although there is the above-mentioned usefulness by widening the tire width, there are not only Fukada but also Asada (footstep settlement about 20 cm) in the field, and traveling in Asada with wide wheels. Then, since the ground contact pressure is low, the bite into the field tiller is weak and the slip ratio becomes large, which causes the planting intervals of seedlings to change, which is important for rice transplanters and paddy work machines. It was a challenge.

On the other hand, preparing both narrow wheels and wide wheels, and selecting and mounting the wide wheels in Fukada and the narrow wheels in Asada is a waste of reality,
The worker himself did not choose to wear it. Therefore, in the present invention, in the conventional agricultural wheel, all the widths of the elastic ring body are almost the maximum width, and the maximum width portion is set to the inner diameter side as much as possible, and the ground contact portion outside the diameter is narrowed. Therefore, it is an object of the present invention to provide an agricultural wheel capable of stabilizing the slip ratio regardless of whether it is Fukada or Asada, and at the same time, being able to immediately respond to deluxe work machines.

[0006]

According to the present invention, there is provided an elastic ring body 5 in which an annular rim 4 is used as a core and the entire rim 4 is covered with an elastic material, and a lug 7 is provided on an outer peripheral portion of the elastic ring body 5. The agricultural wheel 1 integrally includes the following technical means in order to achieve the above-mentioned object. That is, in the present invention according to claim 1, the maximum width portion 8 of the elastic ring body 5 is provided on both left and right side portions of the rim 4, and the width is narrower outward than the maximum width portion 8 via the step portion 9. comprising a Do grounding portion 10, the lugs 7 have protrudes grounding portion 10, before
The step portion 9 has a vertical surface 9A in the cross-sectional shape of the rim 4.
Is defined as the outer diameter, and the concave curved surface 9B is formed continuously on the inner diameter.
And the narrow ground contact portion 10 corresponds to the maximum width portion 8
To 50 to 90% .

Further, in the present invention, the step portion 9
Is a plurality of steps in the radial direction, and the step portions 9 inside and outside the radial direction are
It is desirable to form a rib 11 extending in the circumferential direction between them, and it is desirable that the maximum width portion 8 of the elastic ring body 5 is slightly inside the center diameter of the rim 4. . Further , on the inner peripheral side of the elastic ring body 5 and on the blade lug 6
It is desirable to form the recess 105 between them.

[0008]

When the agricultural wheel 1 according to the present invention is mounted on a paddy field working machine (for example, a riding rice transplanter) to run, it sinks to the maximum width portion 8 in Fukada, and runs under low ground contact pressure. . On the other hand, in Asada, since the cultivator is hard, it does not sink up to the maximum width portion 8 and runs under high ground contact pressure.

Therefore, regardless of whether it is Fukada or Asada, the slip ratio does not change and good performance is exhibited.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B showing a first embodiment of the present invention.
In the agricultural wheel 1 according to the present invention, an axle mounting boss 2 is provided at the center of rotation, and the spokes 3 are radially formed from the boss 2.
Is projected, and an annular rim 4 is fixed to the tip of the spoke 3.

Further, there is provided an elastic ring body 5 having the annular rim 4 as a core and the entire rim 4 being covered with an elastic material such as rubber. The plate-shaped vane lugs 6 respectively projecting at the respective positions are integrally provided with a circumferential interval, and the trapezoidal lug 7 is integrally provided at the outer peripheral portion of the elastic ring body 5 between the vane lugs 6. Further, the rim 4
The maximum width portion 8 of the elastic ring body 5 is provided on both left and right sides of the base, and a narrow ground portion 10 is provided radially outside the maximum width portion 8 via a step portion 9, and the ground portion 10 has the trapezoidal shape. The lug 7 is projected.

Further, the stepped portion 9 has a plurality of steps (two steps in the embodiment as shown in FIG. 2) in the radial direction, and a rib 11 extending in the circumferential direction between the stepped portions 9 inside and outside the radial direction. Is formed. The width A of the maximum width portion 8 is 30 in the conventional case.
What was ~ 40mm was changed to 50-60mm,
The width B of the narrow contact portion 10 is 50 to 90% of that of A.
It is said that.

Here, the B / A ratio is set to 50 to 90% because when it is less than 50%, the trapezoidal lug 7 has a low rigidity and is easily deformed to deteriorate straight running performance, and when it is more than 90%, it contacts the ground contact portion. This is because the significance of narrowing 10 is reduced, and it is preferably 60 to 85%. The maximum width portion 8
2 is slightly inside the center diameter of the rim 4 as shown in FIG. 2, and the inner peripheral shape of the elastic ring body 5 is the inclined surface 1
By setting to 2, the mud is dispersed in the right and left after rotating in the direction of the arrow shown in FIG.

Further, as shown in FIG.
In the cross-sectional shape of the rim 4, the vertical surface 9A is defined as the radially outer side, and the concave curved surface 9B is continuously formed on the radially inner side.
In the first embodiment, the step portion 9 has two steps. here,
The vertical surface 9A is the base width of the trapezoidal lug 7, and by forming the trapezoidal lug 7 in a slightly tapering direction from the base width, the subsidence is secured in Fukada and the soil is hardened by the concave curved surface 9B. Therefore, the right and left runout is surely prevented.

Further, in the agricultural wheel 1 of the first embodiment, the blade lug 6 has a trapezoidal projection 6A which is slightly narrower than the trapezoidal lug 7 as shown in FIG. It is assumed to have flat plate-shaped portions 6B on both sides, as shown in FIG.
When it rotates in the direction of arrow, it is inclined so as to contact the ground from the inner diameter side to the outer diameter side in the soil for float action and traction action.

Further, the rear side in the rotation direction of the blade lug 6 is shown in FIG.
As shown in (A) and FIG. 4, it has a thick portion 6C,
When entering the soil, the blade lug 6 is prevented from being excessively deformed, while the top surface 7A of the trapezoidal lug 7 is shown in FIG.
It has a hexagonal shape, as shown in, to ensure straight-line stability. In the first embodiment shown in FIGS. 1 to 4, the step portion 9 has two steps, but in the second embodiment shown in FIGS. 5A and 5B, one step consisting of the vertical surface 9A and the concave curved surface 9B is used. It may be the stepped portion 9, and at this time, when driving in Fukada,
It will sink to the maximum width part 8 at once.

Further, in the third embodiment shown in FIGS. 6 to 8, the step portion 9 has the circumferential groove 109 and the circumferential rib 209.
Also, the trapezoidal lug 7 has a diamond-cut inclined surface 10 on the front, rear, left and right elevations thereof.
7, the agricultural wheel 1 is shown in which the partition rib 207 is formed for the ground contact portion 10, and other configurations are common to those of the above-described first embodiment, and common portions are indicated by common reference numerals. ing.

FIG. 9 shows a fourth embodiment of the present invention.
An arcuate concave portion 105 is formed in the inner diameter portion of the elastic ring member 5 so as to extend between the blade lugs 6. By forming the concave portion 105, the resistance at the time of turning is reduced and the turning property is improved. It will be possible. In FIG. 9, the number of the spokes 3 is four, and the spokes 3 are reinforced by the discs 103.
It can also be applied to the first to third embodiments.

Further, any one of the first to third embodiments described in the fourth embodiment of FIG. 9 can be applied to the elastic ring member 5. 10 (A), (B), and (C), the agricultural wheels of the above-described embodiment were suitable for being mounted as, for example, the drive wheels (rear wheels) of the rice transplanter, whereas the steering wheels of the rice transplanter ( front wheel)
It is a fifth embodiment suitable as, without the blade lug 6,
T-shaped, L-shaped, and V-shaped lugs 7 are used, and the other configurations are the same as described above.

In the first to fifth embodiments, the rim 4 is exemplified by the pipe material, but it may be constituted by a solid bar material, a plate material or the like.

[0021]

As described in detail above, according to the present invention, the slip ratio does not change regardless of whether it is Fukada or Asada, good performance can be exhibited, and the amount of rubber constituting the elastic ring body is small. Tesumi can provide cheaper agricultural wheels.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, (A) is an overall front view, and (B) is a perspective view of a main part.

FIG. 2 is an enlarged cross-sectional view taken along line XX of FIG.

FIG. 3 is an enlarged sectional view taken along line YY of FIG.

FIG. 4 is a plan view of an essential part of FIG.

5A and 5B show a second embodiment of the present invention, in which FIG. 5A is a cross-sectional view of a main part and FIG. 5B is a perspective view of the main part.

FIG. 6 is a usage state diagram showing a third embodiment of the present invention.

FIG. 7 is a plan view of an essential part of FIG.

FIG. 8 is a horizontal cross-sectional view of the main parts of FIG.

FIG. 9 is an overall front view showing a fourth embodiment of the present invention.

FIG. 10 is a fifth embodiment when the front wheels are used, (A)
Is an overall front view, (B) is a perspective view, and (C) is a plan view.

[Explanation of symbols]

1 agricultural wheels 4 rims 5 elastic ring 6 feather rugs 7 trapezoidal rugs 8 maximum width part 9 steps 10 Ground

Claims (4)

(57) [Claims] 1. An elastic ring body (5) having a ring-shaped rim (4) as a core and the whole of the rim (4) being covered with an elastic material is provided, and a lug (on the outer periphery of the elastic ring body (5) is provided. An agricultural wheel (1) integrally provided with (7), wherein a maximum width portion (8) of the elastic ring body (5) is provided on both left and right sides of the rim (4), and the maximum width portion (8) is provided. ) comprising a narrow ground portion (10) via a step portion (9) in radially outward from said lug (7) is protruded grounding portion (10), the stepped portion (9) , In the cross-sectional shape of the rim (4)
The vertical surface (9A) is the outer side and the concave surface (9
B) is continuously formed, and the narrow grounding portion (10) becomes the maximum width portion (8).
The agricultural wheel is characterized by being 50 to 90% . 2. The step portion (9) has a plurality of steps in the radial direction, and a rib (11) extending in the circumferential direction is formed between the step portions (9) inside and outside the radial direction. The agricultural wheel according to claim 1, which is characterized in that. 3. A maximum width portion (8) of the elastic ring body (5).
The agricultural wheel according to claim 1, characterized in that the diameter is slightly inside the center diameter of the rim (4). 4. An inner peripheral side of the elastic ring body (5) and a blade
The recess (105) is formed between the lugs (6).
The agricultural wheel according to any one of claims 1 to 3, which is a characteristic .