JP2000264011A - Wheel for agricultural use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and easily release and remove the mud filled in a recess in traveling a rice field through the elastic deformation of a thin film part by providing a large number of lugs on an outer circumferential portion of an elastic ring body with intervals in the circumferential direction to form a recess in an end face in the axial direction of a wheel of a lug, and forming a thin film part to divide the recess into a plurality of chambers. SOLUTION: A large number of lugs 2 are projected from an outer circumferential portion of an elastic ring body 10 with intervals in the circumferential direction, and a recess 3 is formed in an end in the axial direction of a wheel. The side view of the recess 3 is substantially triangular, and its section is of pan bottom shape. A radially long thin film part 4 is formed in the recess 3, and divides the recess into two chambers in the circumferential direction, the thin film part 4 is a partitioning wall, and its wall thickness D is smaller than the wall thickness d of an axial portion 2b of the lugs. The thin film part 4 set to this wall thickness separates the filled mud from the surface of the recess 3 through the elastic deformation such as expansion/contraction when the mud is filled in the recess 3, and releases and removes the mud from the lugs 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural wheel having lugs used for a rice transplanter, a direct sowing machine, a scraper and the like.

[0002]

2. Description of the Related Art As shown in Japanese Patent Application Laid-Open No. 9-28133, an agricultural wheel with lugs used in a paddy field or the like is manufactured by baking rubber on an annular core material and circumferentially spacing the peripheral portion thereof. The lug has a shape in which the axial portion protrudes from the circumferential portion at the center of the wheel, and the axial portion has a substantially triangular side view, and its end face (in the wheel axial direction). On the end face), a recess is formed for reducing the amount of rubber to reduce the weight and improve the cushioning performance.

[0003]

In the above-mentioned prior art, the formation of the depression on the end face makes it possible to reduce the weight and improve the cushioning performance. However, when traveling in the field, the depression is clogged with mud and solidified after drying. There is a problem that mud is difficult to remove. An object of the present invention is to provide an agricultural wheel capable of solving such a problem.
The present invention provides an agricultural wheel in which a clogged mud is reliably and easily removed from a mold by elastically deforming the thin film portion by forming a thin film portion which divides the inside into a plurality of chambers in a recess at the end surface of the lug. The purpose is to do.

[0004]

A first concrete means for solving the problems in the present invention is to provide a large number of lugs 2 at circumferential intervals on an outer peripheral portion, and to provide an end face of the lugs 2 in a wheel axial direction. That is, the depression 3 is formed, and the thin film portion 4 that partitions the inside of the depression 3 into a plurality of chambers is formed. As a result, lug 2
Even if the mud is clogged in the recess 3 on the end face, the thin film portion 4 also expands and contracts as the lug 2 expands and contracts, and the mud clogged by the elastic deformation of the thin film portion 4 is released from the mold.

[0005] A second concrete means for solving the problem in the present invention is the thin film portion 4 in addition to the first concrete means.
Means that the inside of the depression 3 is divided into a plurality of chambers in the circumferential direction and / or the radial direction. As a result, the mud clogged in the depression 3 can be separated, so that the removal from the mold is facilitated. A third specific means for solving the problem in the present invention is that, in addition to the first or second specific means, the thin film portion 4 has a straight line, a bent line or a curved shape when viewed in the wheel axis direction. is there.

[0006] This makes it possible to easily form a molding die if the shape is straight, and to form the thin film portion 4 if the shape is bent or curved.
Durability and elasticity can be increased. A fourth specific means for solving the problem in the present invention is that, in addition to any one of the first to third specific means, the thin film portion 4 has a thickness of about 1 mm.
That is, the thickness is set to ４4 mm. Thereby, the durability and the mud release performance of the thin film portion 4 can be sufficiently ensured.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In Figs. 1 to 4, reference numeral 1 denotes an agricultural wheel mainly used for a front wheel or a rear wheel of a rice transplanter or the like, which illustrates a pipe burning type, in which three (plural) pipes are formed from a central boss 6; Spokes 7 are provided radially,
A reinforcing plate 8 is fixed across the boss 6 and the spokes 7, and an annular core material 9 made of pipe is attached to the tips of the three spokes 7.
The ring-shaped core material 9 is coated with an elastic material such as rubber and baked to form an elastic ring 10.

A large number of lugs 2 are formed on the outer peripheral portion of the elastic ring body 10 at intervals in the circumferential direction. The lugs 2 are located at equal intervals in the circumferential direction, and are viewed in a plan view (in a radial direction). Has a circumferential portion 2a that is substantially T-shaped and is located substantially at the center in the width direction of the elastic ring body 10, and an axial portion 2b that extends from the circumferential direction portion 2a in the left-right direction (wheel axis direction). The left and right protruding directions of the axial portion 2b are alternately arranged in the circumferential direction, and are parallel to the wheel axis direction or slightly inclined in the circumferential direction from the circumferential portion 2a. It has a substantially triangular shape, and a dent (recess) 3 is formed on its end face.

As shown in FIG. 1, the shape of the recess 3 is substantially triangular, similar to the end face shape of the axial portion 2b, and its cross-sectional shape is, as shown in FIG. (Hemispherical concave portion). A thin film portion 4 which is long in the radial direction is formed in the depression 3 and divides the inside of the depression 3 into two chambers in the circumferential direction, and the thin film portion 4 serves as a partition wall. The thin film portion 4 is curved in a substantially S-shape when viewed from the side, and the thickness D is smaller than the thickness d of the axial portion 2b of the lug 2, for example, set to a thickness of about 0.5 to 6 mm. Yes, about 1
A thickness of 4 mm is preferred.

The thickness D of the thin film portion 4 varies slightly depending on the material of the elastic wheel body 10, the size of the wheel diameter, the use of the front and rear wheels, and the like. Is severely fatigued at the root of the film, the film surface is liable to be damaged, and the durability tends to be problematic. The thickness D is 4
If it is at least 6 mm, especially at least 6 mm, the amount of deformation exerted on the thin film portion 4 will be small even if the lug 2 bends during traveling. In other words, the thickness D of the thin film portion 4 is set such that when the lug 2 bends due to vibration, load, or the like during traveling while ensuring sufficient durability, the lug 2 is affected by the warp and elastically deforms ( (Including extension and compression due to torsion, vibration, etc.).

The thin-film portion 4 having such a thickness is formed by
When the mud is clogged in the depression 3, the clogged mud is pushed or moved or compressed by elastic deformation such as expansion and contraction, separated from the surface of the depression 3, and released from the lug 2. In the second embodiment shown in FIG. 5, a linear thin film portion 4 is formed in each dent 3 along the radial direction one by one, and divides the dent 3 into two equal parts in the circumferential direction. . In the third embodiment shown in FIG. 6, a thin film portion 4 having a bent line shape bent in a zigzag manner is formed one by one in each depression 3.
The recess 3 is divided into two equal parts in the circumferential direction so that the radial expansion and contraction deformation of the thin film portion 4 is easily and increased.

In the fourth embodiment shown in FIG. 7, a linear thin film portion 4 is formed in each of the recesses 3 substantially one by one in the circumferential or tangential direction. The lug 2 is divided and greatly expanded and contracted by the circumferential deformation of the lug 2. In the fifth embodiment shown in FIG. 8, a plurality of (three) thin film portions 4 each having a substantially linear shape substantially radially extending in the circumferential direction are formed in each of the recesses 3, and the recesses 3 are formed in a plurality of circumferentially extending chambers. It is divided into (four chambers), and in particular, a large amount of radial expansion and contraction deformation of the thin film portion 4 is given to the clogged mud.

In the sixth embodiment shown in FIG. 9, a cross-shaped thin film portion 4 is formed in each recess 3, and the recess 3 is divided into four radial and circumferential chambers. In both the radial and circumferential deformations, the thin film portion 4 can be sufficiently elastically deformed. As described in the first to sixth embodiments, the thin film portion 4 is a partition wall that divides the inside of the depression 3 into a plurality of chambers in a circumferential direction and / or a radial direction. The amount is reduced so that the elastic deformation of the thin film portion 4 can be strongly affected on the mud in both chambers, and the effect of removing the clogged mud from the mold is increased.

In a seventh embodiment shown in FIG.
A pneumatic tire is shown as the agricultural wheel 1. An elastic wheel (tire body) 10 is mounted on a rim 12, a tube 13 is inserted therein, and air can be injected by a valve 14. A large number of lugs 2 are formed on the outer peripheral portion of the elastic ring body 10 at equal intervals in the circumferential direction so as to protrude.
Similar to the first embodiment, the elastic ring 1 has a substantially T-shape in plan view.
0 has a circumferential portion 2a located substantially at the center in the width direction, and an axial portion 2b extending in the left-right direction from the circumferential portion 2a.

The left and right protruding directions of the axial portion 2b are alternately arranged in the circumferential direction, become substantially triangular in left and right side views, and have a recess 3 formed in the end face thereof. The direction part 2b has a substantially triangular shape similar to the end face shape of the direction part 2b, and a thin film part 4 which is long in the radial direction is formed in the depression 3 and the inside of the depression 3 is divided into two chambers in the circumferential direction. The part 4 is a partition wall. The thin film part 4 is shown in FIG.
The ones shown in the fifth to ninth embodiments can be adopted, and the inside of the depression 3 can be divided into a plurality of chambers in the circumferential direction and / or the radial direction,
It can be formed into a straight line, a bent line or a curved shape when viewed in the wheel axis direction, and is set to a thickness of about 1 to 4 mm.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
Although the thin film portion 4 completely separates the inside of the recess 3 into a plurality of chambers, the entire length of the base may not be connected to the bottom surface of the recess 3, and the plurality of chambers communicate at the bottom of the recess 3. You may. The ridge line of the thin film portion 4 is flush with the end face of the axial portion 2b, but may be slightly uneven. In addition, the thin film portion 4 has a linear shape bent line shape or a curved shape along the radial direction or the circumferential direction when viewed in the wheel axis direction, but may be inclined with respect to the radial direction or the circumferential direction. If it is, a mold can be easily formed, and if it is a bent line shape or a curved shape, the durability of the thin film portion 4 can be increased.

The thickness D of the thin film portion 4 is preferably about 1 to 4
mm, but the thickness does not have to be uniform,
The root side may be made thicker, and the ridgeline side may have a draft that becomes gradually thinner. The thin film portion 4 is integrally formed of the same material as the axial portion 2b, but is formed separately from a different material, for example, a material having excellent durability, elasticity and the like.
When forming the elastic ring 10, the elastic ring 10 may be arranged in advance in the mold when forming the zero. Although the depression 3 has a pot bottom shape, the depression 3 may be formed in a square bottom shape, and by forming the thin film portion 4, the depth of the depression 3 can be formed to be deeper than in the related art. By doing so, an increase in the amount of rubber due to the formation of the thin film portion 4 can be suppressed.

The lug 2 has a single-blade shape having a substantially T-shaped planar shape.
a may be shifted from the center in the left-right direction, or may be a full blade shape extending from one left and right end to the other end of the elastic ring 10, and may be a polygonal block shape such as a square or hexagon, A high lug or the like that protrudes greatly from the outer peripheral surface in the radially outward direction may be used. The lug 2 has a substantially triangular end face shape, but may have a trapezoidal shape or a square shape, and the depression 3 may have a shape similar to the end face shape of the lug 2 or another shape such as a circular or elliptical shape. It may be.

In the agricultural wheel 1, blade lugs having wings protruding left and right from the left and right side surfaces (wheel axial side surfaces) of the elastic wheel 10 are arranged at regular intervals in the circumferential direction, and the lugs 2 are arranged between the blade lugs. May be provided. In addition, as the agricultural wheel 1, the boss 6, the spokes 7, the reinforcing plate 8, and the annular core material 9 can be formed of a synthetic resin other than metal, and two or more of them can be integrally formed. It is possible, and the pneumatic tire may be of a tubeless type.

[0020]

According to the present invention described above, even if the mud is clogged in the recess 3 at the end face of the lug 2, the mud clogged by the expansion and contraction of the thin film portion 4 as the lug 2 expands and contracts is released. And can be eliminated from the depression 3.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a partial cross-sectional side view of the agricultural wheel.

FIG. 5 is a side view showing a second embodiment of the present invention.

FIG. 6 is a side view showing a third embodiment of the present invention.

FIG. 7 is a side view showing a fourth embodiment of the present invention.

FIG. 8 is a side view showing a fifth embodiment of the present invention.

FIG. 9 is a side view showing a sixth embodiment of the present invention.

FIG. 10 is a sectional view showing a seventh embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Agricultural wheel 2 Rug 3 Depression 4 Thin film part 10 Elastic ring

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B60C 11/11

Claims (4)

[Claims] 1. A large number of lugs are provided on an outer peripheral portion at circumferential intervals, a recess is formed on an end surface of the lug in a wheel axial direction, and a thin film portion that divides the inside of the recess into a plurality of chambers is formed. Features agricultural wheels. 2. The agricultural wheel according to claim 1, wherein the thin film portion divides the inside of the recess into a plurality of chambers in a circumferential direction and / or a radial direction. 3. The agricultural wheel according to claim 1, wherein the thin film portion has a straight line, a bent line, or a curved shape when viewed in the wheel axis direction. 4. The agricultural wheel according to claim 1, wherein the thin film portion has a thickness of about 1 to 4 mm.