JPH11321204A - Farm wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To moderate vibration and impact and improve a tractive force by setting the ratio of the sectional height of an elastic body to the depth of a rib within a specified range. SOLUTION: In a wheel 3, the outer diameter is 650 mm, the tire width is 80 mm, the ring sectional height A is 111 mm, the rib depth (the height of a cutout part 10a) B is 22 mm, and the circumferential length C of the rib 10 is 29 mm. Further, in a rim 8 shown by a round pipe, the coating thickness of the rim 8 is increased by reducing the outer diameter thereof. Namely, B/A×100 is 19.8%, and B/C×100 is 75.9%. Accordingly, the rigidity of the rib 10 is suppressed by setting the depth B of the rib 10 large to the sectional height of an elastic ring body 9 (B/A×100 is 15-30%), and the traction force is improved by increasing the raised surface 10b in the cutout part 10a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural wheel used for paddy fields such as riding rice transplanters and flooded direct sowing machines, or for upland fields such as management machines.

[0002]

2. Description of the Related Art Conventionally, as a wheel mounted on a paddy field vehicle such as a riding rice transplanter, a direct sowing machine, etc., a conventional Japanese Utility Model Application No. 57-1856 has been proposed.
No. 04 (hereinafter referred to as a first conventional example),
Japanese Unexamined Patent Publication No. 284004 (hereinafter referred to as a second conventional example) and the like are known.

[0003]

The wheel of the second conventional example is
Because it has a so-called pneumatic tire configuration, it cannot be avoided in terms of management and durability regarding air bleeding when used in a rice transplanter or the like that is used only once or twice a year. . On the other hand, the wheel of the first conventional example has a so-called rubber-baked wheel configuration in which a pipe rim is covered with rubber, so that the above-described problem of air leakage does not occur.

A first conventional wheel will be described below with reference to the drawings. FIG. 7 shows a paddy field vehicle 1 exemplified by a rear-mounted type four-wheeled rice transplanter.
The vehicle 1 includes a planting device 2 at a rear portion, and runs by front wheels 3 and rear wheels 4. By the way, this kind of vehicle 1 has a float 5 that floats on a mud surface when traveling in a paddy field or the like.
To support the load of the planting device 2 by
When traveling on a road or the like, the planting device 2 is lifted up together with the float 5. Therefore, the center of gravity of the vehicle 1 moves to the front wheel 3 side.

[0005] As shown in FIG. 8 and FIG.
Is a central boss 6 and a plurality of (three in the drawing) spokes 7 provided in the boss 6 in a circumferentially equidistant and radial manner.
And a rim 8 made of a round pipe welded to the protruding ends of these spokes 7 and an elastic ring 9 made of rubber or the like covering the rim 8. It has become.

[0006] On the ring body 9, ribs 10 protruding radially outward and extending in the circumferential direction at the outer periphery of the equator are integrally provided around the notch portion 10a at circumferential intervals with a notch 10a. Lugs 11 are formed on both left and right sides of the rib 10 at predetermined intervals in the circumferential direction to ensure straight running, and lugs 11 are formed in a staggered manner to ensure traction. With such a staggered arrangement, the gap between the lugs 11 can be widened on each of the right and left sides of the rib 10, so that traction during traveling in the paddy field can be sufficiently prevented and mud clogging can be prevented.
Further, the sludge discharging effect can be obtained efficiently.

[0007] The lug 11 has a triangular (or trapezoidal) side shape, and the slope on the side reaching the road surface when moving forward (see arrow C) is a kick surface 11a. , And the slope on the side that sees away from the road surface is the support surface 11b. A straight surface which forms a vertex at an intermediate position between the kick surface 11a and the support surface 11b is defined as a ground surface 11c. The ground surface 11c is extended with a receding angle with respect to the rotation direction C, and the kick surface is formed. 11
A recess 11b is formed in the end surface of the side lug 11 surrounded by the support lug a and the support surface 11b.

The inventor of the present invention has conducted various experiments on the conventional wheel 3, and as a result, has found the following problems. : Although the rib 10 is effective in securing the straight running property, the impact force absorbing performance when riding over a projection during running is inferior, and therefore the height of the rib 10, ie, the notch 10
When the depth a is increased, there is a problem that the rigidity of the rib 10 is extremely reduced.

The elastic material covering the outer periphery of the rim 8 is
Since it is a highly elastic material (for example, a JIS hardness of 62 °) and the coating thickness of the rim 8 is small, the rigidity of the side lug 11 becomes excessively large, resulting in a poor impact force absorbing performance. Was. : From the above, the problem that the damage to the body (rice planting machine) is large, adversely affects the durability, the vibration performance is relatively poor, the riding comfort is inferior, and the planting accuracy by the planting device is reduced. was there.

The present invention has been made in view of the above-mentioned problems, and
An object of the present invention is to provide an agricultural wheel capable of reducing vibration and impact and improving traction by improving the depth or length of a rib in relation to the cross-sectional height of an elastic ring.

[0011]

According to the present invention, there is provided an elastic ring 9 having an annular rim 8 as a core and entirely covered with an elastic material.
And a rib 10 extending circumferentially around the outer periphery of the elastic ring 9.
Are integrally provided with a circumferential interval, and a side lug 11 having a kick surface 11a and a support surface 11b is provided on a side portion of the rib 10.
In order to achieve the above-mentioned object, the following technical measures have been taken for an agricultural wheel integrally provided with:

That is, in the agricultural wheel according to the first aspect, when the sectional height of the elastic ring 9 is A and the depth of the rib 10 is B, B / A × 100 is 15 to 30%. It is characterized by having. The agricultural wheel according to claim 2 is characterized in that, when the depth of the rib 10 is B and the circumferential length of the rib 10 is C, B / C × 100 is 60 to 80%. Is what you do.

Further, in the agricultural wheel according to the third aspect, the elastic ring 9 has a sectional height A, the rib 10 has a depth B, and the rib 1 has a rib 1.
If the circumference of 0 is C, B / A × 100 is 15 to 3
B / C × 100 is 60 to 8
0%. Also,
The agricultural wheel according to claim 4 is characterized in that, in claims 1 to 3, the axially outer end face of the side lug 11 is formed with a hollow 12, which is equal to or the same as the radial outer edge 12 </ b> A of the recess 12. A rib bottom 10C is formed at a radially inner position from 12A, and a cutout recess 12 is formed in the axially outer end surface of the side lug 11, which is equal to or radially outer edge 12A of the recess 12. A rib bottom 10C is formed at a position radially inside the edge 12A.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings, and portions common to those described with reference to FIGS. I have.
1 to 3 show a first embodiment.
Is an outer diameter of 650 mm, a tire width E of 80 mm, a cross section height A of 111 mm, a rib depth (height of the notch 10a) B
Is 22 mm, the circumferential length C of the rib 10 is 29 mm, and the outer diameter of the rim 8 shown by a round pipe is reduced so that the coating thickness D of the rim 8 is increased. .

That is, the wheel 3 shown in FIGS.
100 is 19.8% and B / C × 100 is 75.9.
%. That is, by increasing the depth B of the rib 10 with respect to the sectional height A of the elastic ring 9,
0 while suppressing the rigidity of the notch 10a.
The traction force was improved by increasing b.

FIG. 4 shows a second embodiment. This wheel 3 has an outer diameter of 600 mm, a tire width E of 60 mm, a sectional height A of 95 mm, a rib depth B of 20 mm, and a rib circumference C of 28 mm. It is said that. That is, B / A ×
100 is 21.1% and B / C100 is 71.4%.

FIG. 5 shows a third embodiment. This wheel 3 has an outer diameter of 550 mm, a tire width E of 60 mm, a sectional height A of 80 mm, a rib depth B of 20 mm, and a rib circumference C.
Is 27 mm. That is, B / A ×
100 is 25% and B / C × 100 is 74.1%.

FIG. 6 shows a fourth embodiment. This wheel 3 has an outer shape of 500 mm, a tire width of 60 mm, a sectional height A of 65 mm, a rib depth B of 18 mm, and a rib circumference C of 2 mm.
9 mm. That is, B / A × 100
Is 27.7% and B / C × 100 is 62%.

As is clear from the first to fourth embodiments shown in FIGS. 1 to 6, B / A × 100 is 15 to 30% and B / A × 100 is B / A × 100.
By setting C × 100 to 60% to 80%, vibration and impact can be reduced by reducing the rigidity of the rib 10 without affecting the side lug 11 for obtaining the traction force. By increasing the rib depth, the amount of rubber used can be reduced, thereby reducing costs and improving productivity.

In each of the embodiments shown in FIGS.
On the axially outer end surface of the side lug 11, a hollow recess 12 is formed in a trapezoidal or triangular shape in side view and a cross-section is formed as a curved surface, and has a diameter equal to or larger than a radial outer edge 12 A of the concave portion 12. A rib bottom 10c (corresponding to the rib height) is formed at the inner position, whereby
This is because the rigidity of the rib 10 is reduced to reduce the vibration and the impact while improving the traction force by the upright surface 10b.

In the embodiment shown in FIGS. 1 to 6, the rubber constituting the elastic ring 9 is desirably low elastic rubber, and the tire width E is set smaller than the sectional height A. When the side end portion of the side lug 11 is within the tire width E and is not protruded in the axial direction, the mud soil is not excessively scraped up during traveling in the paddy field, and the wheel 3 is used for a rice transplanter. The fall of mud etc. was able to be suppressed at the planting mark of the plant.

The lug pattern shown in FIG. 2 is an example, and the side lugs 11 are arranged at a receding angle with respect to the rib 10 (see FIG. 2). And may be an orthogonal array. Also, as shown in FIGS. 3 to 5, the inner peripheral surface of the elastic ring 9 is formed to have a triangular cross section to form the slanted sloped portion 9 </ b> A, thereby preventing mud and the like from adhering to the inner peripheral surface of the ring. It is advantageous.

Further, as shown in FIGS. 3 to 5, a step 9B is formed on the side surface of the ring body 9 and a disc (disk) is mounted on the step 9B, thereby removing mud.
This is advantageous because water and the like can be prevented from passing. Next, the test results are shown in Table 1 below.

[0024]

[Table 1]

The test machine is a 6-row planting such as a riding rice transplanter, and has a test tire, an outer diameter of 650 mm, and a tire width of 80 mm.
mm, the rib depth is 12 mm in the conventional example, and the index is shown with this conventional example as 100. The larger the numerical value is, the more advantageous the traction force is, and the smaller the numerical value is advantageous for the impact and vibration. It is advantageous that the smaller the value of the mud brush, the smaller the value.

Here, as is apparent from Table 1, it can be understood that the embodiment of the present invention in which the rib depth is 17 mm, 22 mm and 27 mm is advantageous in all aspects of traction, impact, vibration and mud brush. . The above embodiment is an example, and the wheel according to the present invention can also be used for a management machine or the like.

[0027]

As described in detail above, according to the present invention, by suppressing lug rigidity and securing the height of the ribs, it is possible to greatly reduce the shock absorption and traction force, reduce the damage to the fuselage and improve the vibration performance. An excellent baked wheel can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a partially developed plan view of FIG.

FIG. 3 is an enlarged sectional view of FIG. 1;

FIG. 4 is a sectional view showing a second embodiment.

FIG. 5 is a sectional view showing a third embodiment.

FIG. 6 is a sectional view showing a fourth embodiment.

FIG. 7 is a side view of the rice transplanter.

FIG. 8 is a side view of a wheel.

FIG. 9 is a partially developed plan view of a wheel tread.

[Explanation of symbols]

 3 wheel 8 rim 9 elastic ring 10 rib 11 side lug

Claims (5)

[Claims] 1. An elastic ring (9) having an annular rim (8) as a core and entirely covered with an elastic material, and a rib (10) extending in a circumferential direction on an outer periphery of the elastic ring (9). Agricultural wheels integrally provided with a circumferential lug and a side lug (11) having a kicking surface (11a) and a supporting surface (11b) on the side of the rib (10). In the above, when the cross-sectional height of the elastic ring (9) is A and the depth of the rib (10) is B, B / A × 100 is 15 to 30%. . 2. An elastic ring (9) having an annular rim (8) as a core and entirely covered with an elastic material, and a rib (10) extending in a circumferential direction on an outer periphery of the elastic ring (9). Agricultural wheels integrally provided with a circumferential lug and a side lug (11) having a kicking surface (11a) and a supporting surface (11b) on the side of the rib (10). The agricultural wheel according to any one of claims 1 to 3, wherein B / C x 100 is 60 to 80%, where B is a depth of the rib (10) and C is a circumferential length of the rib (10). 3. An elastic rim (9) having an annular rim (8) as a core and entirely covered with an elastic material, and a rib (10) extending circumferentially around an outer periphery of the elastic rim (9). Agricultural wheels integrally provided with a circumferential lug and a side lug (11) having a kicking surface (11a) and a supporting surface (11b) on the side of the rib (10). In the above, when the sectional height of the elastic ring (9) is A, the depth of the rib (10) is B, and the circumferential length of the rib (10) is C, B / A
× 100 is 15-30%, and B / C
Agricultural wheels characterized in that x100 is 60 to 80%. 4. A cutout recess (12) is formed in the axially outer end surface of the side lug (11), and is equal to or the same as the radial outer edge (12A) of the recess (12). The agricultural wheel according to any one of claims 1 to 3, wherein a rib bottom (10C) is formed at a more radially inner position. 5. The rim (8) is a round pipe material, and the outer diameter of the rim (8) is reduced to increase the coating thickness D of the rim (8). Item 5. The agricultural wheel according to any one of Items 1 to 4.