JP2000225807A - Agricultural wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a wheel from excessively sinking in a wheel of which the elastic wheel body is formed with a lug part having ribs in the circumferential direction and side lugs on its outer circumference by forming the maximum width part of the elastic wheel body except the lug part out of left and right swelling parts projecting downward on the outer diameter position than the outer diameter part of a rim. SOLUTION: An agricultural wheel such as a front wheel of a riding rice transplanter, is provided with a center boss 6 for fitting to an axle, spokes 7 radially provided around the boss 6, a rim 8 circular-ring-likely supported with the spokes 7, and an elastic wheel body 9 covering the whole rim 8 with elastic material, and a lug part having circumferential ribs and side lugs downward projectingly provided on the outer circumference of the elastic wheel body 9. In this case, the maximum width part 12 of the elastic wheel body 9 except the lug part is formed out of left and right swelling parts 12L, 12R downward projecting on the outer diameter position than the outer diameter part of the rim 8. Hereby, regardless of a paddy field or a farmland, sinking of the wheel is restrained by the left and right swelling parts 12L, 12R, and the wheel exhibits appropriate slip rate and tractive force.

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
Since it has a so-called pneumatic tire configuration, it cannot be avoided in terms of management and durability of 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 rim made of a pipe 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. 10 shows a paddy field vehicle 1 exemplifying a rear-mount type riding four-wheel rice planter, and this vehicle 1 includes a planting device 2 at a rear portion thereof.
The vehicle travels with the front wheels 3 and the rear wheels 4. By the way, this kind of vehicle 1 supports the load of the planting device 2 by the float 5 floating on the mud surface when traveling in a paddy field or the like, but lifts the planting device 2 together with the float 5 when traveling on a road or the like. Has become. Therefore, the center of gravity of the vehicle 1 moves to the front wheel 3 side.

As shown in FIGS. 11 and 12, the front wheel 3 has a central boss 6 and a plurality of (three in the drawings) spokes 7 provided on the boss 6 at equal and radial positions in the circumferential direction.
And a rim 8 made of a round pipe welded to the protruding ends of the spokes 7, and an elastic ring 9 made of an elastic material such as rubber having the rim 8 as a core and covering the whole. It is a so-called rubber-baked wheel.
A circumferential rib 10 protruding radially outward and extending in the circumferential direction at the outer periphery of the equator is formed integrally with the elastic ring body 9 at a circumferential interval by a notch 10a. Side lugs 11 are formed on both left and right sides of the rib 10 at predetermined intervals in the circumferential direction so as to be staggered (alternately arranged in the circumferential direction) so as to secure traction. I have. With such a staggered arrangement, the distance between the side lugs 11 in the circumferential direction can be widened on each of the right and left sides of the circumferential rib 10, so that traction during paddy traveling is sufficient and mud between the lugs is reduced. The clogging is prevented and the effect of drainage is efficiently obtained.

[0006] The side lug 11 has a triangular (or trapezoidal) side surface, and a kicking surface 11a is used as a kicking surface 11a when the vehicle advances (see arrow C). A slope opposite to the side of the road 11a and on the side that sees away from the road surface is defined as a support surface 11b. In addition, a straight surface forming a vertex at an intermediate position between the kick surface 11a and the support surface 11b is defined as a ground surface 11c.
c is extended with a receding angle with respect to the rotation direction C, and a recess 11b is formed in an end surface of the side lug 11 surrounded by the kick surface 11a 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. : The main purpose of the circumferential rib 10 is to ensure straightness, but since the ground contact surface is narrow, swinging in the left and right directions is likely to occur, and the impact force mitigation performance when riding over a projection during running is reduced. When the height of the circumferential rib 10, that is, the depth of the notch 10 a is increased, the rigidity of the circumferential rib 10 is extremely reduced, and there is a problem that the straightness cannot be sufficiently secured.

[0008] The elastic material covering the outer periphery of the rim 8 is
Since it is a highly elastic material (for example, JISA hardness of 62 °) and the coating thickness of the rim 8 is large (thick), the rigidity of the side lug 11 is excessively large, and the impact force absorbing performance is deteriorated. However, there is a problem that the amount of adhering mud and the like becomes large. : 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 inventor has disclosed in Japanese Patent Application Laid-Open No. 7-47813.
In the above item, "a boss, a plurality of spokes radially attached to the boss in an equidistant manner, an annular rim fixed to the tips of these spokes, and a ring body covering the rim and made of an elastic material. In the wheel of a paddy field vehicle provided with a plurality of lugs projecting radially outward on the wheel body in the circumferential direction, the wheel body swells in the left-right width direction of the rim. A bulging portion, wherein the bulging portion is an intermediate portion between a radially outer position of the ring body between the lugs and the bulging portion,
And a wheel for a paddy field vehicle characterized by being thicker than an intermediate portion between a radially inward position of the ring body and the bulging portion. According to the wheel of the paddy field vehicle, the wheel is buried in mud because the wheel body is provided with a bulging portion that bulges in the left-right direction. In addition, the bulging portion is located between the lugs at an intermediate portion between the radially outward position of the ring body and the bulging portion, and the radially inner position of the ring body with the bulging portion. The intermediate part of the ring is thicker than the intermediate part, so that no extra elastic material is consumed in these intermediate parts, so that the consumption of the elastic material constituting the ring body can be suppressed. It can be manufactured at cost. "

However, in the third conventional art, the bulging portion bulging in the left-right direction corresponds to the maximum width portion of the elastic ring, and sinks to the maximum width portion in a field (including wetlands and fields). Therefore, since the maximum width portion (bulging portion) is provided on the left and right sides of the rim, there is a problem that the amount of settlement increases. Further, since the circumferential rib in the third conventional example has the same configuration as that of the first conventional example described above, there is a problem similar to that of the first conventional example. Further, the spoke type rubber baked wheel in the third conventional example is
When used as a front wheel of a paddy field work machine such as a rice transplanter,
Since the front wheels are steered, there is a problem that mud clogging is apt to occur between spokes. And the like.

In view of the above, the present inventor disclosed in Japanese Patent Application Laid-Open No. 9-207502 that the outer peripheral edge of a disk fixed to an axle or the like was formed by forming steps on the left and right side surfaces of an elastic ring. An agricultural wheel (paddy field wheel) in which mud clogging between spokes is prevented by fitting to the stepped portion has been proposed (fourth conventional example). In the fourth conventional example, since the step portion is formed on the left and right, the amount of rubber for forming the step portion (the thickness of the covering portion on the left and right rims) increases.
It has been found that there is a problem in that the mud adheres to the covering portion on the side where the disk is not mounted (usually on the side of the fuselage), and the carrying around becomes severe.

The lug portions (circumferential ribs and side lugs) of the wheel in the fourth conventional example are the same as those in the first conventional example described above, so that the above-described problems remain. The present invention provides an agricultural wheel that solves the above-mentioned problems (1) to (4), and can exhibit an optimal slip ratio and traction force regardless of a use place such as a paddy field or an upland field, and can reduce resistance when coming off the ground (mud, upland field). It is an object of the present invention to provide an agricultural wheel (rubber baked wheel) that can reduce the power consumption while reducing the power consumption.

[0013]

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.
In order to solve the above-described problem, the following technical means is used for an agricultural wheel having a lug portion having a circumferential rib 10 and a side lug 11 formed on the outer periphery of the elastic ring 9. I'm taking it. That is, the agricultural wheel according to the present invention has a maximum width portion 12 of the elastic ring 9 excluding the lug portion.
Are formed by left and right bulges 12L and 12R that protrude in the left-right direction at positions outside the outer diameter of the rim 8 (claim 1).

By adopting such a configuration,
It is possible to control the settlement of the wheels (aircraft subsidence) regardless of the paddy field and the farmland, so that an appropriate slip ratio and traction force can be exhibited, and the impact force mitigation function can be improved. The left and right bulges 12L, 12R protruding in the left-right direction according to claim 1.
Is formed by a curved outer surface in cross section, and the left and right covering portions 13L and 13R of the rim 8 in the radially inner portions of the left and right bulging portions 12L and 12R are parallel to the left and right parallel surfaces 14L parallel to the ring body equatorial plane. , 14R or the right and left inclined surfaces 15L, 15R along the cross-sectional shape of the rim 8 (claim 2).

By adopting such a configuration,
In addition to the above-described functions and effects, there is little resistance when coming off the ground, power consumption can be reduced, and the lifting amount of mud and the like when getting off the ground is reduced. Furthermore, according to claim 1 or 2, the coating thickness for covering the entire rim 8 with the elastic material is the outer diameter covering portion 16 of the rim 8 and the rim 8.
Inner diameter covering portion 17 and right and left covering portions 13L, 1 of rim 8
The coating thickness is reduced in the order of 3R (claim 3).

By adopting such a configuration,
Not only was it possible to reduce the adhesion of mud, it was possible to reduce the amount of rubber used to reduce costs, but also to shorten the time required for baking rubber, thereby improving productivity. In the first aspect, the lug portion having the circumferential ribs 10 and the side lugs 11 is provided with a notch 10a between the circumferential ribs 10 by arranging the circumferential ribs 10 at intervals in the circumferential direction. The side lug 11 has a kick surface 11a and a support surface 11b and is formed in a trapezoidal cross section, and a connecting portion 18 between the circumferential rib 10 and the side lug 11 is formed to be wide in the circumferential direction. The side lugs 11 are arranged alternately left and right in the circumferential direction (claim 4).

By adopting such a configuration,
Not only the right and left wobble of the circumferential rib 10 is suppressed, so that the straight running property can be improved, but also the impact force reducing function can be improved. Furthermore, a hollow 11d is formed in the axially outer end face of the side lug 11, and the hollow 1
The bottom 10b of the cut portion 10a is formed at the same radial position or the radial inner position as the radial outer edge 11e of 1d (claim 5). By adopting such a configuration, it is possible to reduce the excessive rigidity of the circumferential rib 10 and reduce the vibration and impact while improving the traction force by the kick surface 11a.

Further, the present invention provides a boss 6 for mounting an axle.
And spokes 7 provided radially around the boss 6
A rim 8 held by the spokes 7 in an annular shape, and an elastic ring 9 having the rim 8 as a core and entirely covered with an elastic material. In order to solve the above-mentioned problem, the following technical measures are taken for an agricultural wheel in which a lug portion having a side lug 10 and a side lug 11 is formed. That is,
In the agricultural wheel according to the present invention, the left and right bulging portions 12L in which the maximum width portion 12 of the elastic ring 9 excluding the lug portion protrudes in the left-right direction at a position outside the outer diameter portion of the rim 8 in the left-right direction. , 12
One of the left and right covering portions 13L, 13R of the rim 8 in the radially inner portions of the left and right bulging portions 12L, 12R has a thinner covering thickness and the other has a thicker covering portion. The stepped portion 2 on which the disk 19 for preventing the mud clogging between the spokes 7 is fitted is provided on the outer side surface of the ring body on the side of.
0 is formed on a concentric circle centered on the axis of the boss 6 (claim 6).

By adopting such a configuration,
Not only can the sinking amount of the fuselage be suppressed to reduce the resistance to coming off from the ground, but also because the coating thickness of the coating portion 13L in which the disk 19 is not fitted is small, the lifting amount of soil and the like can be suppressed, and the amount of rubber used can be reduced. Was also reduced. Furthermore, in the above-described claim 6, it is recommended to include the constituent elements of claim 4 or claim 5 (claim 7), and the step portion (20) is formed in an annular shape or a circumferential direction continuous in the circumferential direction. It is preferable that the first and second portions be formed intermittently.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a description will be given of a case where a agricultural wheel 3 according to the present invention is used as a front wheel of a riding rice transplanter 1. However, as long as the agricultural wheel 3 according to the present invention is a rubber-baked wheel, the agricultural wheel 3 can be used not only for paddy traveling work machines such as a walking type rice transplanter and a flooded direct sowing machine but also for upland traveling work machines such as a management machine and a control machine. Is also applicable. 1 to 5 show a first embodiment of an agricultural wheel 3 according to the present invention. The agricultural wheel 3 according to the present invention includes a central (center) axle mounting boss 6 and a periphery of the boss 6. A spoke 7 exemplarily formed of a round pipe material radially provided on a rim 8 illustrated by a round pipe material held in an annular shape by the spokes 7;
An elastic ring 9 having the rim 8 as a core and the whole of which is coated with an elastic material such as rubber, and a lug portion having a circumferential rib 10 and a side lug 11 on the outer periphery of the elastic ring 9 is protruded. The reinforcing plate 6A is welded to the boss 6 and the spokes 7 therearound.

The agricultural wheel 3 has left and right bulging portions in which the maximum width portion 12 of the elastic wheel 9 excluding the lug portion protrudes in the left and right direction at a position outside the outer diameter portion of the rim 8. 12
L, 12R, where the sinking of the wheels (aircraft sinking) is performed regardless of the paddy fields and the fields,
It is possible to suppress due to the 2R, to exert a proper slip ratio and traction force, and to improve the impact force mitigation function not only from the impact directly below the wheel but also from the left and right. The left and right bulging portions 12L, 1 protruding in the left-right direction.
The outer shape of the cross section of the 2R is formed by a curved surface, and the left and right covering portions 13L and 13R of the rim 8 in the radially inner portions of the left and right bulging portions 12L and 12R are parallel left and right parallel surfaces parallel to the equatorial plane of the wheel body. As shown in FIG. 8, the left and right inclined surfaces 15L and 15R are formed along the cross-sectional shape of the rim 8.

By adopting such a configuration,
In addition to the above-mentioned effects, the resistance when coming off the ground is small, the horsepower consumption can be reduced, and the lifting amount of mud and the like when leaving the ground is reduced. A circumferential rib 10 protruding radially outward and extending in the circumferential direction at the outer periphery of the equator is formed integrally with the elastic ring body 9 at a circumferential interval by a notch 10a. Side lugs 11 are formed on both left and right sides of the rib 10 at predetermined intervals in the circumferential direction so as to be staggered (alternately arranged in the circumferential direction) so as to secure traction. I have. With such a staggered arrangement, the distance between the side lugs 11 in the circumferential direction can be widened on each of the right and left sides of the circumferential rib 10, so that traction during paddy traveling is sufficient and mud between the lugs is reduced. The clogging is prevented and the effect of drainage is efficiently obtained.

The side lug 11 has a triangular (or trapezoidal) side surface shape, and kicks a slope on the side reaching the road surface at the time of forward movement (see arrow C) shown in FIG. The slope opposite to the kick surface 11a and on the side that sees away from the road surface is defined as a support surface 11b. In addition, a straight surface forming an apex at an intermediate position between the kick surface 11a and the support surface 11b is defined as a ground surface 11c, and the ground surface 11c is extended in parallel with the axle direction as shown in FIG. A recess 11b is formed in the end surface of the side lug 11 surrounded by the support surface 11b and the support lug 11b.

That is, the lug portion having the circumferential ribs 10 and the side lugs 11 is formed by arranging the circumferential ribs 10 at intervals in the circumferential direction so that the cut portions 10 a are formed between the circumferential ribs 10.
Is formed, and the side lug 11 is formed with a kick surface 11a and a support surface 11b.
The connecting portion 18 between the circumferential rib 10 and the side lug 11 is formed to be wide in the circumferential direction, and the side lugs 11 are alternately arranged left and right in the circumferential direction. In addition, a cutout recess 11d having a semicircular cross section is formed in the axially outer end surface of the side lug 11, and a cut is made at the same radial position as the radial outer end edge 11e or at the radial inner position. A bottom 10b of the portion 10a is formed.

By adopting such a configuration,
Not only can the straightness of the circumferential rib 10 be prevented from swaying left and right can be improved by the connecting portion 18, but also the impact force reducing function can be improved. In addition, the formation of the hollow 11 d allows the circumferential rib 10 and the side of the circumferential rib 10 to be formed. Lug 11
Kick surface 11 while reducing excessive rigidity to reduce vibration and shock
The traction force can be improved by a. Further, the coating thickness for covering the entire rim 8 with the elastic material is such that the outer coating portion 16 of the rim 8, the inner coating portion 17 of the rim 8, and the right and left coating portions 13 </ b> L, 13 </ b> R of the rim 8 become thinner in this order. And
As a result, not only the adhesion of mud can be reduced, but also the amount of rubber used can be saved and the cost can be reduced, and the rubber baking time can be shortened to improve the productivity.

Referring to FIG. 4 more specifically,
The agricultural wheel 3 according to the first embodiment has an outer diameter of 650.
mm, tire width (lug width, tread width) E;
Ring body section height A: 95 mm, rib depth (height of cut portion 10a) B: 22 mm, circumferential length C of rib 10: 29 mm, covering section height D of rim 8: 54.5 mm, tire maximum width 1
2; 70 mm; inner diameter side sectional width F; 43 mm. That is, B / A × 100 is about 23.2%,
B / C × 100 is about 75.9%. As described above, the rigidity of the rib 10 is suppressed by increasing the depth B of the rib 10 with respect to the sectional height A, while the cut portion 10a is formed. The traction force has been improved by raising the elevation 10c in
F / E × 100 is about 53.8%, and the coating thickness is reduced in the order of the outer diameter coating portion 16, the inner diameter coating portion 17, and the right and left coating portions 14L and 14R. By setting the large portion 12 at a position outside the diameter of the rim 8, the sinking of the fuselage is suppressed, the resistance when the wheel 3 comes out of the mud in the latter half of rotation is reduced, and the horsepower consumption is reduced. It limits the carry around.

The F / E is optimally 40 to 65%, and if this value is 40% or less, the position of the rim 8 is on the outer diameter side and the thickness (height) of the outer diameter coating portion 16 is reduced. As the size becomes smaller, the vibration mitigation function is reduced. On the other hand, if it is 65% or more, the lifting of mud becomes large. Further, although not shown, the tire maximum width portion 12 is located at a position outside the diameter of the rim 8.
Is formed by the left and right bulging portions 12L and 12R, the wheel 3 can be configured as follows.

The outer diameter is 650 mm, the tire width E is 80 mm, the cross section height A of the wheel body is 111 mm, the rib depth (height of the notch 10a) B is 22 mm, the circumferential length C of the rib 10 is 29 mm, and B / A × 100 Is 19.8%, and B / C × 10
0 should be 75.9%. Outer diameter 600mm, tire width E 60mm, cross section height A 95mm, rib depth B 2
0 mm, rib circumference C is 28 mm, and B / A × 100
Is 21.1% and B / C100 is 71.4%.
The diameter is 550 mm, the tire width E is 60 mm, the cross-section height A is 80 mm, the rib depth B is 20 mm, and the rib circumference C is 27 m.
m, B / A × 100 is 25%, B / C × 100
Should be 74.1%.

An outer diameter 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
Is 29 mm, B / A × 100 is 27.7%,
C × 100 should be 62%. B / B
A × 100 is 15-30%, B / C × 100 is 60%
By setting it 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, and the run-out of the rib 10 can be reduced by the wide connecting portion 18. By suppressing the stop, straightness is ensured, and by increasing the rib depth, the amount of rubber used is reduced, thereby reducing costs and improving productivity.
Because of this, the sinking of the aircraft was suppressed.

FIGS. 6 to 8 show a second embodiment of the agricultural wheel 3 according to the present invention. In this wheel 3, the maximum width portion 12 of the elastic wheel 9 excluding the lug portion is the same as that of FIG. Rim 8
Left and right bulges 12L and 12R protruding in the left-right direction at a position outside the outer diameter of the right and left bulges.
Left and right covering portions 13 of the rim 8 in inner diameter portions of L and 12R
L, 13R have a step thickness on one side of which the coating thickness is thin and the other is thick, and a disc 19 for preventing mud clogging between the spokes 7 is fitted on the outer surface of the ring body on the side of the thick coating portion 13R. The portion 20 is formed on a concentric circle centered on the boss 6 axis.

By adopting such a configuration,
Not only can the sinking amount of the fuselage be suppressed to reduce the resistance to coming off from the ground, but also because the coating thickness of the coating portion 13L in which the disk 19 is not fitted is small, the lifting amount of soil and the like can be suppressed, and the amount of rubber used can be reduced. Was also reduced, and productivity was improved. Further, the step portion 20 is formed in an annular shape that is continuous in the circumferential direction, but may be formed intermittently in the circumferential direction. In this case, the step portion 20 is provided on the outer periphery of the disk 19 at intervals in the circumferential direction. It is assumed that the tongue piece fitted to the step portion 20 protrudes.

Incidentally, as shown in FIG.
Is attached to an axle that is attached to the boss 6 via a fastening means 21 such as a bolt. In the second embodiment, the configuration other than the formation of the step portion 20 is the same as that of the first embodiment described above with reference to FIGS. 1 to 5, and thus the common portions are denoted by common reference numerals. Further, as shown in FIG. 9A, the relationship between the rib 10 and the side lug 11 in the tread portion may be such that the left and right lugs 11 have a receding angle with respect to the rotation direction C, Further, as shown in FIG. 9B, one of the left and right lugs 11 has a receding angle, and the other is orthogonal, and these can be arranged alternately on the left and right.

[0033]

As described above in detail, according to the present invention, in a rubber-baked wheel, excessive sinking can be reliably prevented and mud lifting can be reduced, so that the wheel-type traveling device can be used regardless of paddy fields and fields. It is informative.

[Brief description of the drawings]

FIG. 1 is a partially omitted front view showing a first embodiment of an agricultural wheel according to the present invention.

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

FIG. 3 is a TT enlarged sectional view of FIG. 1;

FIG. 4 is an enlarged sectional view taken along line XX of FIG. 1;

FIG. 5 is an enlarged sectional view taken along the line YY of FIG. 1;

FIG. 6 is a partially omitted front view showing a second embodiment of the agricultural wheel according to the present invention.

FIG. 7 is a partially developed plan view of a tread portion of FIG. 6;

FIG. 8 is an enlarged sectional view taken along line TT of FIG. 6;

FIG. 9 is a plan view showing another two examples (A) and (B) of FIGS. 2 and 6;

FIG. 10 is an overall side view of the riding rice transplanter.

FIG. 11 is a front view showing a conventional agricultural wheel.

FIG. 12 is a partially developed plan view showing a tread portion of FIG. 11;

[Explanation of symbols]

 Reference Signs List 3 wheel 6 boss 7 spoke 8 rim 9 elastic ring 10 rib 11 side lug 12 tire maximum width portion 12L, 12R bulging portion

Claims (8)

[Claims] 1. An elastic ring (9) having an annular rim (8) as a core and entirely covered with an elastic material, and a circumferential rib (10) and a side formed on an outer periphery of the elastic ring (9). Rug (11)
The agricultural wheel in which the lug portion having the ridge portion is formed to protrude, the maximum width portion (1) of the elastic ring (9) excluding the lug portion.
2) Agricultural wheels characterized in that left and right bulges (12L) and (12R) protruding in the left-right direction at positions outside the outer diameter of the rim (8). 2. A left and right bulging portion (12) protruding in the left and right direction.
L) and (12R), the outer shape of the cross section is formed by a curved surface, and the left and right bulges (12L) (12R)
R), the right and left covering portions (13) of the rim (8) in the inner diameter portion.
L) (13R) is a left-right parallel plane (1
The agricultural wheel according to claim 1, characterized in that it is formed by left and right inclined surfaces (15L) (15R) along the cross-sectional shape of the rim (8). 3. The coating thickness for covering the entire rim (8) with an elastic material is as follows: the outer rim portion (16) of the rim (8), the inner rim portion (17) of the rim (8) and the rim (8). 3. The agricultural wheel according to claim 1, wherein the left and right covering portions (13L) and (13R)) have a smaller covering thickness in this order. 4. A lug portion having a circumferential rib (10) and a side lug (11) is formed by arranging the circumferential ribs (10) at intervals in a circumferential direction. A notch (10a) is formed in between, and the side lug (11) has a kick surface (1).
1a) and a support surface (11b), and is formed in a trapezoidal cross section, and a connecting portion (18) between the circumferential rib (10) and the side lug (11) is formed wide in the circumferential direction. hand,
The agricultural wheel according to claim 1, wherein the side lugs (11) are arranged alternately left and right in the circumferential direction. 5. A hollow (11d) is formed in the axially outer end surface of the side lug (11), and the hollow (11d) is formed.
The agricultural wheel according to claim 4, characterized in that the bottom (10b) of the cut portion (10a) is formed at the same radial position as the outer peripheral edge (11e) or the inner radial position of the outer peripheral edge (d). 6. A boss (6) for mounting an axle, and spokes (7) provided radially around the boss (6).
A rim (8) held in an annular shape by the spokes (7) and an elastic ring (9) having the rim (8) as a core and entirely covered with an elastic material are provided. 9) In an agricultural wheel having a lug portion having a circumferential rib (10) and a side lug (11) formed on the outer periphery of the agricultural wheel, the maximum width portion (1) of the elastic wheel body (9) excluding the lug portion.
2) are formed of left and right bulges (12L) and (12R) protruding in the left-right direction at positions outside the outer diameter of the rim (8), and the left and right bulges (12L). The left and right covering portions (13L) (13) of the rim (8) in the inner diameter portion of the (12R)
R), one of which has a small coating thickness and the other has a large thickness, and the outer ring surface on the side of the thick coating portion (13R) has:
A farm wheel characterized in that a step (20) for fitting a disc (19) for preventing mud clogging between spokes (7) is formed on a concentric circle centered on the boss (6) axis. . 7. The agricultural wheel according to claim 6, comprising the component according to claim 4. 8. The agricultural wheel according to claim 6, wherein the step portion (20) is formed in an annular shape continuous in the circumferential direction or intermittently in the circumferential direction.