JPH0948202A - Wheel for farming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To insure tractive force performance capable of dealing with increase of power of a farming machine. SOLUTION: This invention concerns a wheel for farming in which flat-plate- like wings 8 bendingly deformable in the circumferential direction and elastically restorable after deformation are integratedly formed at substantially regular intervals in the circumferential direction on an elastic wheel body 7. In this wheel for farming, the flat-plate-like wing 8 is projected in the radial direction from the elastic wheel body 7, it is constituted of a large wing part 9 of large projection on one side in the axle direction and a small wing part 10 of small projection on the other side, the bite-in earth side of the large wing part 9 is formed into a flat plate part 9A on the radial line 0 of the wheel, the radially inside part 9B continued to the flat plate part 9A is spread toward the radially inside end at a fixed angle θ front and rear in the circumferential direction against the radial line O of the wheel, and the angle 9 of the large wing part 9 is set 66-180, so as to make penetrating resistance in the earth optimum and prevent the wheel from sinking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural wheel mounted and used on an agricultural work machine.

[0002]

2. Description of the Related Art As an agricultural wheel of this type, an annular ring made of iron is coated with rubber to form an elastic ring body, and a large number of blades are integrally provided on the elastic ring body at equal intervals in the circumferential direction. It is known that a plurality of lugs are provided between the blades and the blades are inclined with respect to the ring diameter line (see Japanese Patent Publication No. 61-57201).

The above agricultural wheel has a problem that the slip ratio is large, and it has been proposed to enlarge the blades in order to solve this problem. However, the wheel sinks largely in sandy or soft ground, and the traction performance is sufficient. There is a problem that you can not exert it. Therefore, the applicant of the present application has proposed an agricultural wheel that can solve the above problems (Japanese Patent Application No. 4-137260).
issue).

That is, in this agricultural wheel, a plate-like blade that is bendable in the circumferential direction and elastically recoverable after the deformation is integrally formed on an elastic wheel body at substantially equal intervals in the circumferential direction. The flat blade is projected in the radial direction more than the elastic ring body, and is composed of a large blade portion having a large protrusion amount on one side in the axle direction and a small blade portion having a small protrusion amount on the other side, and the large blade portion is The ground-in side is a flat plate portion on the wheel radial line, and the radially inner portion following the flat plate portion is 45 to 45 in the circumferential direction with respect to the wheel radial line.
It widens toward the inner diameter end at an angle of 55 °.

[0005]

By the way, the above-mentioned prior art has the advantage that the wheel sinking is small and the traction performance can be exhibited. However, in order to support various types of agricultural work, it is essential to increase the horsepower of the machine. However, there is a drawback in that it cannot fully respond to such requests. The present invention has been made in view of the above situation, and an object thereof is to provide an agricultural wheel having traction force and rigidity capable of coping with an increase in horsepower of the machine and preventing the sinking of the wheel. There is.

[0006]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, according to the present invention, flat blades that can be bent and deformed in the circumferential direction and that can be elastically restored after the deformation are integrally formed on the elastic ring body at substantially equal intervals in the circumferential direction. The blades are projected in the radial direction from the elastic ring body, and are composed of a large blade portion with a large amount of protrusion in one of the axle directions and a small blade portion with a small amount of protrusion in the other of the axles. A large-blade part, which is a flat wheel portion on a wheel radial line, and an inner radial portion following the flat plate portion is expanded toward the radial inner end at a predetermined angle in the circumferential direction with respect to the wheel radial line. The angle of the inner diameter portion is 66 to 180 ° (claim 1).

In this case, the reason why the opening angle θ of the radially inner portion of the flat blade is set in the range of 66 to 180 ° is that when the angle is 66 ° or less, the wheel sinkage becomes large, and when it is 180 ° or more, the muddy soil is lifted. This is because the amount will increase. In the present invention, the radially inner portion of the flat blade causes penetration resistance into the soil, the wheel sinkage becomes appropriate in response to the increase in horsepower of the machine, and the flat portion is appropriately digged into the soil. As a result, slippage is eliminated and the traction performance of the wheel is sufficiently exhibited, and the rigidity of the radially inner portion is increased, so that vibration is reduced and durability is increased.

Further, according to the present invention, a vibration-preventing rib extending in the circumferential direction is provided on the rear side of the flat blade in the wheel advancing rotation direction so as to prevent vibration and can be applied to various agricultural works. Item 2). Further, according to the present invention, a stepped portion having a reduced wall thickness is provided at least at the rear side in the wheel forward rotation direction of the radially inner portion of the large blade portion. Therefore, since the thin portion of the step portion bends and moves due to the rotation of the wheel, it becomes difficult for mud to adhere to the inner portion of the blade diameter (claim 3).

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention, 1 is an agricultural wheel, a boss having an insertion hole 2 for an axle of a management machine and a mounting hole 3 for fixing pins, bolts and the like. 4, three spokes 5 that are radially welded to the outer periphery of the boss 4, a hollow metal rim 6 that is a wheel core material that is welded to the outer ends of each spoke 5, and is attached to the rim 6. And an elastic ring body 7 made of an elastic material such as rubber.

The elastic ring body 7 is provided with substantially trapezoidal flat blades 8 which can be bent and deformed in the circumferential direction and can be elastically restored after the deformation. It is integrally formed so as to be located on the circumference. Each flat blade 8 is projected radially outward and axially from the outer periphery of the elastic ring body 7, and a large blade portion 9 having a large projection amount L1 in one axial direction is projected in the other axial direction. The small blade portion 10 having a small amount L2 is integrally formed, and the protrusion ratio (L2 / L1 × 100) of both blade portions 9 and 10 is 50 to 80%. That is, when the protrusion ratio is less than 50%, it is advantageous in terms of preventing the adhesion of mud but disadvantageous in terms of traction force, and when the index ratio exceeds 80%, there is no problem in terms of traction force, but mud. It is disadvantageous in terms of prevention of adhesion of the above, so that it is preferably 50 to 80% in terms of both the traction force and the adhesion of mud.

The large blade portion 9 and the small blade portion 10 are also provided.
Are alternately arranged at substantially equal intervals in the circumferential direction, and the large blades 9
Is a flat plate portion 9A on the axle radial line 0 on the ground-inward side, and a radially inner portion 9B following the flat plate portion 9A forms a predetermined angle θ (90 °) in the circumferential direction with respect to the axle radial line 0. To the inner diameter end at 45 °, and when viewed from the side of the boss 4, the large blade portion 9 has a substantially Y-shape (circumferentially symmetrical shape) in a side view. Reference numeral 10 has a flat plate shape on the wheel diameter line 0.

The ratio of the height h of the flat plate portion 9A to the total height H of the large blade portion 9 (h / H × 100) is 5
0% or more is preferable, and the height of the flat plate portion 9A is 5
If it is less than 0%, the desired traction force cannot be obtained. Further, the opening angle θ of the radially inner portion 9B of the large blade 9 is 66
When the angle is set to 180 ° (optimally 100 ° to 120 °), the traction force and the sinking of the wheel 1 are balanced, and the optimum penetration resistance into the soil is obtained, so that the horsepower of the machine can be sufficiently increased. When the opening angle θ is 65 ° or less, the subsidence of the wheel 1 is large, and when it is 181 ° or more, the amount of lifting the mud is large.

The flat blade 8 is, as shown in FIG.
It has a substantially trapezoidal shape and its ground contact top surface is located on the same circumferential surface. Also, as shown in FIG. 2, the wall thickness on the reverse side (anti-kick side) is made larger than that on the forward side (kick side). , A substantially trapezoidal lug (see FIG. 3) is formed substantially in the center of the elastic ring body 7 in the axial direction,
By improving straightness and suppressing vibration, excessive deformation during forward movement is suppressed and a large traction force is secured.

Between the flat blades 8 of the elastic ring member 7, the outer periphery of the flat ring 8 is tapered outward in the radial direction (see, for example, FIG. 4).
An elastic protrusion 11 having a nipple-like cross section is formed,
The inner circumference of the anti-grounding surface is tapered toward the axis (for example, as shown in FIG. 4, the cross-sectional shape of which the tip is an arc surface is substantially triangular)
Inner peripheral projections 12 are integrally formed so as to connect the flat blades 8 to each other, and the amount of bite into the soil, the optimization of the vibration suppressing force, the lateral displacement prevention in the axial direction, and the adhered sediment It is designed to prevent lifting of the.

Further, on the rear side of the flat blade 8 in the wheel forward rotation direction, that is, on the reverse side, a vibration preventing rib which is located on the elastic projection 11 (axle radial line 0) and extends in the circumferential direction following the blade 8 is formed. 13 are provided. The outer peripheral surface of the rib 13 is flush with the outer peripheral surface of the blade 8. The rib 13 can be omitted. Further, as shown in FIG. 2, the radially inner portion 9B of the large blade portion 9 of the flat blade 8 on the rearward traveling side (the side opposite to the kick surface) is provided with a step 14 whose thickness changes abruptly to form a thin portion. However, the rotation of the wheel 1 causes the thin-walled portion to bend and move (deform), so that the adhered mud can be prevented and the adhered mud can be removed.

FIG. 6 shows the second embodiment of the present invention. The difference from the first embodiment is that the angle of the radially inner portion 9B of the large blade portion 9 with respect to the axle radial line 0, that is, the forward side θ1 is the reverse side. It is smaller than the angle θ2 and has an asymmetric shape in the circumferential direction, and the same effect as that of the first embodiment can be expected. Therefore, the same reference numerals as in FIG. 1 are given and detailed description thereof is omitted.

7 and 8 show the third embodiment of the present invention. The difference from the first embodiment is that the angle of the inner diameter portion 9B of the large blade portion 9 with respect to the axle radial line 0 is 90 °, That is, the opening angle θ is 180 °, and the side view shape is substantially T-shaped, and the same effect as that of the first embodiment can be expected. Therefore, the same reference numerals as those in FIGS. 1 and 2 are given, and detailed description thereof is omitted.

[0018]

EXAMPLE The ratio (L2 / L1) of the protrusion amounts L1 and L2 of the blade portions 9 and 10 in the first embodiment and the conventional example, and the traction force and the sinking force at the opening angle θ of the radially inner portion 9B of the large blade portion 9 Table 1 shows the results of testing the relationship between the amount of soil and the amount of mud lifted. The weight of the test machine is 48 kg.

[0019]

[Table 1]

As is clear from Table 1, in the embodiments of the present invention, the traction force is sufficiently secured for the airframe with increased horsepower, the sinking amount of the wheels is extremely small, and the lifting amount of the mud is extremely small. Therefore, it is possible to cope with a wide variety of agricultural work. The present invention is not limited to the above embodiment, for example, a disc instead of the spokes,
The rim should be a solid material (including flat plate or square bar) instead of the pipe material, the flat blades should be arranged in a fixed direction without being arranged alternately on the left and right, and a trapezoidal lug should be provided between the flat blades. You can

[0021]

As described above, the present invention provides the elastic ring body with
Flat blades that can be bent and deformed in the circumferential direction and that can be elastically restored after the deformation are integrally formed at substantially equal intervals in the circumferential direction, and the flat blades are more radial than the elastic ring body. The large blade portion protrudes and has a large protrusion amount on one side in the axle direction and a small blade portion having a small protrusion amount on the other side. Is an agricultural wheel in which the radial inner portion is expanded toward the radial inner end at a predetermined angle in the circumferential direction with respect to the wheel radial line, and the angle of the radial inner portion of the large blade portion is 66 to
Since it is set to 180 °, a sufficient pulling force is secured by the flat blade part of the large blade part to infiltrate into the soil, and the penetration resistance to the soil is appropriately given at the inner diameter part. Prevents wheel subsidence, can be used in a wide range of fields such as hard fields, soft fields, and sand fields, as well as normal fields.Furthermore, it can handle a wide variety of agricultural work due to the increase in horsepower of this machine, and the rigidity of the inner diameter part can be improved. And the durability is improved (claim 1).

Further, according to the invention of claim 2, since a vibration preventing rib extending in the circumferential direction is provided on the rear side of the flat blade in the wheel advancing rotation direction, vibration is prevented by the rib. It can assist the traction force and fully exert the original traction force of the wheel. Further, according to the invention as set forth in claim 3, since a stepped portion having a reduced wall thickness is provided at least on the rear side in the wheel advancing rotation direction of the radially inner portion of the large blade portion, mud removal is good. It is possible to prevent the adhesion of mud.

[Brief description of drawings]

FIG. 1 is a partially omitted front view showing a first embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a sectional view taken along line DD of FIG. 2;

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

FIG. 7 is a partially omitted front view showing a third embodiment of the present invention.

FIG. 8 is a view as seen in the direction of arrows EE in FIG. 7;

[Explanation of symbols]

 1 Agricultural Wheel 7 Elastic Wheel Body 8 Flat Blade 9 Large Blade 9A Flat Plate 9B Diameter Inner Part 10 Small Inner Blade 10 Small Blade 13 Vibration Prevention Rib 14 Step 0 Wheel Diameter θ Angle

Claims (3)

[Claims] 1. A flat plate blade, which is bendable in the circumferential direction and elastically recoverable after the deformation, is integrally formed on the elastic ring body at substantially equal intervals in the circumferential direction. The blade is projected in a radial direction from the elastic ring body and is composed of a large blade portion having a large amount of protrusion in one of the axle directions and a small blade portion having a small amount of protrusion in the other of the axles. In a flat plate portion on a radial line, a radially inner portion following the flat plate portion is an agricultural wheel in which it is expanded toward the radially inner end at a predetermined angle in the circumferential direction with respect to the wheel radial line. An agricultural wheel characterized in that an angle of a radially inner portion is set to 66 to 180 °. 2. The agricultural wheel according to claim 1, wherein a vibration-preventing rib extending in the circumferential direction is provided on the rear side of the flat blade in the wheel advancing rotation direction. 3. The agricultural wheel according to claim 1, wherein a step portion having a reduced wall thickness is provided on at least a rear side of a radially inner portion of the large blade portion in a wheel forward rotation direction. .