JP2532720Y2 - Agricultural wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an agricultural wheel used for an agricultural work machine such as a rice transplanter or a seeder.

(Prior Art) Conventionally, as this kind of agricultural wheel, one illustrated in FIG. 14 is known (for example, see Japanese Patent Publication No. 61-57201). The agricultural wheel 21 forms an elastic ring 22 by coating rubber on an iron annular rim, forms a number of blades 23 on the ring 22 at equal intervals in the circumferential direction, and further includes a plurality of blades 23 between each blade 23. Rug 24
The blade 23 is inclined with respect to the centripetal line of the ring body 22 and its radial inner end 25 projects radially inward from the circumference of the ring body.

(Problems to be Solved by the Invention) By the way, in the above-mentioned prior art, for example, the outer diameter of the wheel is 800 mm, and the blades 23 project from both sides in the axial direction from the wheel body 22 and have a blade width of 150 mm. Was attached to a rice transplanter and planted in a paddy field. As a result, it was found that a slip of 7 to 13% occurred in a field with footprint sinking of 20 cm and a slip of 15 to 25% in a field with footprint sinking of 40 cm.

Since the rice transplanters plant seedlings at every constant rotation of the wheels, slipping of the wheels will cause variations in the planting intervals. Therefore, it is difficult to reduce the wheel slip ratio to zero, but it is required to reduce it as much as possible.

The slip of the agricultural wheel mainly occurs when the lug touches the plow, and if the interval between the blades is large, the slip ratio and the variation thereof increase. Therefore, the slip ratio can be reduced by increasing the number of blades to increase the traction force. However, the increase in the number of blades in the prior art results in an increase in the number and amount of lifting of mud and the increase in the number of adjacent strips. There is a problem that the mud lifted by the feathers falls on the seedlings already planted and the degree of pushing down the seedlings increases. The mud lifting action of the blade is related to the width of the blade and the amount of protrusion from the inner circumference of the wheel in the radial direction. This is due to the fact that the blade has a single blade protruding only one side in the axial direction from the ring (for example, Japanese Utility Model Publication No.
-39282).

The present invention has been made in view of the above-described situation, and aims to reduce the slip ratio of the wheels and reduce the variation thereof, thereby ensuring sufficient tractive force and straightness, and It is an object of the present invention to provide an agricultural wheel capable of reducing mud lifting.

(Means for Solving the Problems) In the present invention, the following technical measures were taken to achieve the above object.

That is, the agricultural wheel according to the present invention includes the elastic wheel 8,
Plate-like blades 9 projecting radially outward and projecting in the axial direction
Are integrally formed at intervals in the circumferential direction,
An agricultural wheel in which a large lug 10 and a small lug 11 each having a substantially trapezoidal shape are integrally formed between the blades 9 that are adjacent in the circumferential direction when viewed in the axial direction (side view). The axial width 10B of the grounding surface of the large lug 10 is larger than the axial width 8B of the elastic ring 8 and smaller than the axial extension of the blade 9 in the circumferential direction. The small lug 11 is disposed between the blade 9 and the large lug 10 that are circumferentially adjacent to each other, and is formed in a substantially inverted trapezoidal shape when viewed in the circumferential direction. The axial width 11B is narrower than the axial width 8B of the elastic ring 8, and is formed substantially trapezoidal when viewed in the circumferential direction.

(Operation) When the agricultural wheel 1 according to the present invention is used, for example, as a rear wheel (drive wheel) of a riding type rice transplanter, the blade 9 exhibits a float function and traction, and the large and small lugs 10, 11 It travels in a paddy field by exerting its straight-line function and traction.

Here, the arrangement of the wheel 1 in the rotational direction (circumferential direction) with respect to the blade 9 is as follows: the blade 9, the small lug 11, the large lug 10, and the small lug 1.
1. The order of the blades 9 is that the plate surface of the blades 9 has a float function and a traction force, and when the blades 9 slip, the small lugs 11 that bite into the soil (mud) provide straightness and traction. However, when the small lug 11 slips, the large lug 10 has a substantially inverted trapezoidal shape, and exhibits a large traction force.

That is, the portion having the highest slip ratio is the central portion in the circumferential direction between the blades 9, and the large lug 10 having a substantially inverted trapezoidal shape is located at the central portion.
The large lugs 10 and the blades 9 between the large lugs 10 and the blades 9 reliably prevent large slips.
By arranging 11, it is possible to improve the bite into the mud while reducing the lifting due to the mud embedment.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 10 show a first embodiment, wherein reference numeral 1 denotes an agricultural wheel used in a rice transplanter, which has a substantially cap-shaped boss 4 having a shaft hole 2 in the center and a mounting bolt hole 3 on the outer periphery thereof. Then, three spokes 5 are radially welded, and the boss 4 and the spokes 5 are welded.
The spokes 5 are reinforced by the brackets 6 welded to the
A hollow metal rim 7 serving as an annular core material is welded to the tips of the three spokes 5, and an elastic material such as rubber is coated on the rim 7 to form an elastic ring 8. The blade 9, large lug 10, and small lug 11 are integrally formed at substantially equal intervals in the circumferential direction. The blades 9, the large lugs 10, and the small lugs 11 protrude from the outer periphery of the elastic ring body 8 at substantially the same height in a radially outward direction.

The elastic ring 8 is preferably made of a rubber material having a JIS hardness of 70 to 90 degrees, and may be coated with a uniform thickness over the entire outer periphery of the rim 7 having a circular cross section. The outer peripheral side (ground contact side) is coated so as to be thicker, and the rim 12 is tapered radially inward on the inner peripheral side of the wheel body.
Are formed. Then, the raised portion 12 on the peripheral side of the ring body
The tapered top 12a is formed over the entire circumference of the ring body 8 and functions as a watershed that divides mud into right and left.

The blades 9 obtain strong traction force and upward reaction force, that is, buoyancy during forward rotation, and are formed on the elastic wheel 8 at substantially equal intervals in the circumferential direction. The number of the blades 9 is appropriately set according to the size of the elastic ring 8, and is 7 to 11.
Sheets, especially 8 to 10 sheets are preferred.

Further, the blades 9 protrude from both sides in the axial direction from the elastic ring body 8 in order to exert a traction force as a main body, and have a width thereof.
9B has a sufficient width, and protrudes largely inward and outward from the circular portion of the elastic ring body 8.
The central portion in the axial direction is substantially coincident with the top portion 12a of the raised portion 12 of the elastic ring body 8 and is inclined so as to become narrower from both sides in the width direction to the center side to have a connection without a step portion. With such a shape, the blade 9, the blade 9 and the elastic ring 8
To prevent clogging of mud at the connecting portion of the raised portions 12. The straight line L connecting the points where the arc 9 passing through the approximate center of the blade 9 alternates with the center of the inner and outer ends of the blade 9 is a smooth tread having a forward rotation direction front surface 9b formed of a curved surface and a flat surface. The angle α (for example, with respect to the centripetal edge C of the elastic ring 8)
35 °), and the widthwise end 9C of the rear surface in the forward rotation direction is recessed to make it thinner, giving some flexibility, and reducing impact from stones etc. while traveling on the road. Have been.

The large lug 10 is disposed at a substantially central position between the blades 9 and between the small lugs 11, and is located on the outer peripheral side of the wheel body (on the ground surface side).
Project from both sides in the axial direction so as to gradually become wider than the axial width 8B of the elastic ring 8, and have a substantially inverted trapezoidal cross section parallel to the axis, and a substantially trapezoidal shape when viewed from the side. The protruding portions on both sides in the axial direction gradually decrease in circumferential direction toward the protruding direction (that is, the width direction) end portion, so that the mud spill surface 10 that smoothly digs into the soil and prevents the mud from being lifted up.
a is formed, and the axial width 10B is about 30 times the width 9B of the blade 9.
% Is set. Therefore, the large lug 10
, The generated traction and mud lifting action are smaller than the blades 9, but larger than the small lugs 11.

The width 10B of the large lug 10 is the width 8B of the elastic ring 8 in the axial direction.
About 113%. In addition, the radial outer end surface of the large lug 10
It is inclined 10c in the axial direction at an inclination angle of about 8 degrees, and reinforcing portions 10d are formed on both sides in the circumferential direction at the base to ensure sufficient strength and straightness.

The small lug 11 has a substantially trapezoidal shape when viewed from the side and in the circumferential direction, has a substantially octagonal shape when viewed from the outer periphery, and has a tapered portion 11a at the tip. The axial width 11B on the outer peripheral side of the elastic ring (ground contact surface side) is 75 to 80% of the axial width 8B of the elastic ring 8 and about 60% of the axial width 10B of the large lug 10.
% Is set. Reinforcing portions 11b are formed on both sides of the base of the small lug 11 in the circumferential direction to prevent buckling.

Note that the small lugs 11 bite into the tillage by the biting portion 11a to generate traction force and ensure straightness, and no mud lifting action occurs.

In the first embodiment, the inner ends of the blades 9, the large lugs 10, and the small lugs 11 do not protrude radially inward from the inner periphery of the elastic ring 8, so that the mud lifting action inside the diameter is performed. It can be extremely small.

FIG. 11 shows a second embodiment of the present invention, which differs from the first embodiment in that the blades 9 protrude inward from the inner diameter end of the elastic ring 8 by a predetermined amount. This is the same as the first embodiment. Therefore, the same reference numerals are given and the detailed description is omitted.

FIG. 12 and FIG. 13 show a third embodiment of the present invention, in particular, the blade 9.
The wheels of a rice transplanter, such as a walk-type two-row planting and a riding-type four-row planting, are used for a single-blade wheel or the like that does not protrude to the seedling side because it rolls near the seedling. The wings 9
The lugs 10 and 11 protrude radially outward from the elastic ring 8 at substantially the same height as the lugs 10, and protrude only on one side in the axial direction of the elastic ring 8.
The amount of protrusion is equal to or greater than the amount of protrusion on one side of the blade 9 of the first embodiment, and the other side surface 9d of the blade 9 is located more inward than the side surface of the elastic ring 8. The other arrangement of the blades 9 and the relation between the elastic ring 8 and the lugs 10 and 11 are substantially the same as those of the first embodiment.

The one-side protruding blades 9 in the third embodiment, that is, the single blades, can be arranged only on the outside or only on the inside, and further, can be arranged in a zigzag pattern alternately inside and outside.

The small holes indicated by reference numeral 13 in FIGS. 1, 6, 8 and 11 are positioning pin holes of the mold during wheel molding.

The present invention is not limited to the above embodiment, and can be variously modified. For example, it is possible to provide an elastic ring that can be attached to and detached from the outer periphery of the rim like a tubeless tire without forming the elastic ring 8 on the outside of the rim 7.

(Effects of the Invention) As described in detail above, according to the present invention, between the blades 9 that exhibit the float function and the traction force, the large and small lugs, which are substantially trapezoidal in side view and exhibit the straight-line function and the traction force, are integrated with the elastic ring. In the agricultural wheel 1 formed in the above, the large lug 10 is
The axial width 10B of the grounding surface of the large lug 10 is larger than the axial width 8B of the elastic ring 8 and smaller than the axial extension of the blade 9 Since it is formed in a substantially inverted trapezoidal shape when viewed in the circumferential direction,
It is possible to reliably prevent the slip at the portion where the maximum slip occurs at the central portion in the circumferential direction between the blades 9.

That is, although the slip can be prevented even if the blades 9 are arranged in the center portion in the circumferential direction between the blades 9, the pitch of the blades is substantially reduced. A large lug 10 is integrally provided to prevent the mud from being lifted while reliably preventing slippage.

In addition, the small lugs 11 are attached to the blades 9 adjacent in the circumferential direction.
And the small lug 11 is disposed between the large lug 10 and the axial width 11B of the grounding surface of the small lug 11 is smaller than the axial width 8B of the elastic ring 8 so as to form a substantially trapezoidal shape when viewed in the circumferential direction. As a result, it is possible to reduce the lifting of the mud by embedment of the mud between the blade 9 and the large rug 10 by making the bite into the mud good, and immediately after the blade 9 slips,
11 acts to provide straightness and traction, followed by a large lag
Supplementing up to the traction exerted by 10, it is possible to provide an agricultural wheel with low slip and good straightness as a whole.

[Brief description of the drawings]

1 to 10 show a first embodiment of the present invention. FIG. 1 is an overall front view, FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 4 is a sectional view taken along line BB of FIG. 1, and FIG. 4 is a sectional view taken along line CC of FIG.
FIG. 5 is a sectional view taken along line DD of FIG. 1, FIG. 6 is a sectional view taken along line EE of FIG. 1, FIG. 7 is a top view of FIG. 6, and FIG. FIG. 9 is a sectional view taken along line FF of FIG. 1, FIG. 9 is a top view of FIG. 8, FIG. 10 is an enlarged view of a portion G of FIG. 1, and FIG. FIG. 12, FIG. 13 and FIG. 14 show the main part of the third embodiment of the present invention, FIG. 12 is a sectional view corresponding to the section taken along line BB of FIG. 1, and FIG. FIG. 14 is a front view, partly broken away, of a conventional example taken along line C of FIG. 1 ... agricultural wheel, 8 ... elastic ring, 8B ... axial width, 9
… Feather, 9B… axial width, 10… large rug, 10B… width width, 11… small rug, 11B… axial width.

Claims (1)

(57) [Scope of request for utility model registration] A plate-like blade (9) projecting outward in the radial direction and projecting in the axial direction is formed integrally with the elastic ring (8) at intervals in the circumferential direction. A large lug (10) and a small lug (11), which are substantially trapezoidal in the axial direction (side view) between the adjacent blades (9), are formed integrally with each other; Is arranged at the center in the circumferential direction between the blades (9), and the axial width (10B) of the grounding surface of the large lug (10) is larger than the axial width (8B) of the elastic ring (8). The small lug (11) is wide and smaller than the amount of protrusion of the blade (9) in the axial direction, and is formed in a substantially inverted trapezoidal shape when viewed in the circumferential direction. )
And the large lug (10), the axial width (11B) of the contact surface of the small lug (11) is smaller than the axial width (8B) of the elastic ring (8). An agricultural wheel, which is formed in a substantially trapezoidal shape when viewed in a circumferential direction.