JPH08156502A - Entire rubber wheel for traveling on paddy field - Google Patents

Abstract

PURPOSE: To install a wheel without lateral distinction, and improve mud dropping property by setting the form of the section parallel to the equator of a lug axially extended and arranged at equal circumferential intervals on a thread part in such a manner as to be bisymmetric to the lug central line even in any axial section. CONSTITUTION: A tire part 26 is integrally combined with a mounting part 21 formed of a mounting member 20 connected to a spoke 18A outside forming a disc part 18, and a lug 34 is laterally alternately arranged on a thread part 26A at equal circumferential intervals to be vertically extended from the equator to the outside of the wheel shafl direction. In the lug 34, its sectional form cut in a plane parallel to the equator 31 is set so as to be a mountain form in which bisymmetric side wall inclined surfaces are recessed to the central line of the lug 34 even in any section on the wheel axial direction. Since the circumferential section of the lug 34 is thus longitudinally symmetric in the rotating direction, the tire can be installed for both right and left uses, the spoke type disc part 18 makes it difficult to adhere mud to an entire rubber tire mounting part 21, and traction performance can be kept without having a careless mud dropping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a total rubber wheel for paddy field traveling, in which a total rubber tire is integrally combined with a mounting portion of a wheel disk part, and corresponds to a type having directivity for mounting on an axle. Regarding wheels.

[0002]

2. Description of the Related Art A conventional total rubber wheel for traveling in paddy fields is shown in FIGS.
As shown in FIG. 1, the tread surface 70 of the all rubber tire
The lugs 72 are arranged in a V shape and are alternately arranged on both sides of the equator 74. At the time of traveling, the lug 72 is designed so that the front end a of the V-shape first comes into contact with the ground, and then the rear portion b comes into contact with the ground. This allows the lug 72 to travel while discharging mud to the side and prevent clogging of mud. It is possible to maintain traction without coming. For this reason, the wheel has directionality in the tread tread portion 70 of the tire with respect to the rotating direction during use.

To attach and detach all rubber wheels to and from the machine body, the bosses of the wheels are inserted into the axle of the machine body from the outside toward the inside. To transmit the rotation of the axle to the wheel, there are a method of transmitting using a polygonal cross-sectional shape, a method of transmitting by inserting a key, and the like.To regulate the axial movement of the wheel, use a screw at the tip of the axle. There is a method in which through holes are provided in the bosses of the axle and the wheels and the bolts and nuts are used to stop the holes. In any case, the insertion direction of the boss portion of the wheel with respect to the axle is fixed, and the wheel has directionality when mounted on the axle.

Therefore, when the right paddy running total rubber wheel is installed by reversing it for the left side, the tread tread portion is manufactured and prepared with directionality as described above, and therefore the lug of the tread tread portion is provided. Is reverse to the direction of rotation of the wheel in use, that is, the rear end portion b of the C-shape is grounded first, and then the front end portion a is grounded. The improvement function cannot be obtained. Therefore, it cannot be used commonly on the left and right.

As described above, in the case of a total rubber wheel for traveling in paddy field, the total rubber tire having the tread tread having the directionality with respect to the rotation direction is integrally combined with the disk part of the wheel having the directionality for mounting on the machine body. Since the left and right wheels are not compatible and need to be prepared separately, it is necessary to manufacture a pair of left and right wheels, which causes a problem of increasing capital investment and burden of wheel storage space. There is also a risk that the right and left will be installed incorrectly for a paddy field vehicle.

[0006] In the disc portion of the wheel, if the disc portion is a disc-shaped one made of a continuous rolled plate, it is excellent in robustness and the like, but mud adheres to the disc portion of the all-rubber tire and easily accumulates as a large lump. Lifted as the wheels rotate,
There is a problem that the mud is carelessly dropped in an undesired place, and it causes harm to cultivation and transplanting work.

[0007]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention has only one type without any left / right division, and has a mud-removing property that does not cause inadvertent mud-removal due to mud accumulation on the mounting portion of all rubber tires. The purpose is to obtain an excellent paddy wheel for traveling in paddy fields.

[0008]

In order to achieve the above object, the invention as set forth in claim 1 includes a mounting boss for an axle and a plurality of spokes joined to the mounting boss and extending outward in the radial direction. A tire mounting portion provided on the outer side in the radial direction of the spoke, and a total rubber wheel for traveling in a paddy field, which is obtained by integrally combining a total rubber tire with the mounting portion,
The tread tread portion of the tire has a large number of lugs arranged at substantially equal intervals in the circumferential direction extending in the axial direction, and the lug has a cross-sectional shape cut along a plane parallel to the equator, which cross-section in the tire axial direction. Is also characterized by being substantially bilaterally symmetrical with respect to the center line of the lug.

The invention according to claim 2 is characterized in that the all-rubber tire is provided on its inner diameter side with a protrusion having a substantially acute tip at a cross-sectional shape taken along a plane including the tire axis. .

The invention of claim 3 is characterized in that the inner end portion of the lug on the equator side is connected to a rib extending in the tire circumferential direction.

The invention of claim 4 is characterized in that the circumferential width of the lug is gradually reduced toward the outer side in the tire axial direction.

According to a fifth aspect of the present invention, in the circumferential cross section of the lug, the inclination angle of the side wall inclined surface of the lug with respect to the surface including the tire axis is gradually reduced toward the outer side in the tire axial direction.

[0013]

In the rubber wheel for traveling paddy of the present invention as set forth in claim 1, since the circumferential cross section of the lug of the tread tread portion is longitudinally symmetrical in the rotational direction, the wheel can be left-right shared by being turned over. it can. And since the disc part is a spoke type, the mud is unlikely to adhere to the mounting part of the total rubber tire due to the space between the spokes, and the mud will not be lifted during running, so there will be no accidental drop of mud, and Since the tread is less likely to be clogged with mud, traction can be maintained.

According to the second aspect of the present invention, the rubber wheel for paddy traveling according to the second aspect of the present invention is provided with a projecting portion having a substantially acute angled tip on the inner diameter side of the total rubber tire. The mud will not be lifted even if it falls and the wheels rotate, eliminating the worry of careless mud removal.

According to the third aspect of the present invention, the rubber wheel for traveling in paddy fields according to the present invention is effective in skid resistance because the end of the lug on the equatorial side is connected to the rib extending in the tire circumferential direction. Good straightness can be obtained.

In the paddy field traveling total rubber wheel according to the present invention, when the lug steps into the soil by the rotation of the wheel, the mud enters between the lugs, and therefore it is necessary to discharge the mud to the side. However, since the circumferential width of the tread tread portion of the lug is gradually reduced toward the tire axial direction outer side, the groove portion surrounded between the lugs becomes wider from the equator side toward the axial outer side, and as a result, The soil is discharged smoothly to the side, mud is less likely to be clogged, and traction is improved.

According to the fifth aspect of the present invention, in the rubber wheel for traveling in paddy field according to the present invention, the inclination angle of the side wall inclined surface of the lug with respect to the plane including the tire axis in the circumferential cross section of the lug is directed outward in the tire axial direction. Since it gradually decreases, the width at the bottom of the groove between the lugs becomes wider from the equator toward the outer side in the tire axial direction. As a result, the soil is smoothly discharged, mud is less likely to be clogged, and traction is improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rubber wheel for paddy field traveling according to the present invention will be described with reference to FIGS.

As shown in FIGS. 4 to 7, a mounting boss 12 is disposed at the axial center of the paddy field traveling total rubber wheel 10. The mounting boss 12 has a circular tubular shape,
It is mounted on the axle 14A of the rice transplanter 14. This axle 1
4A is formed on a quadrangular shaft (FIG. 4) or a round shaft (FIG. 5), and the fitting hole 16 of the mounting boss 12 is fitted onto the axle 14A. When the axle 14A is a round axle, a key 16A is inserted as shown in FIG. 5 to transmit the rotation of the axle 14A to the wheels.

Further, as shown in FIG. 4, the mounting boss is provided with a threaded mounting hole 17, and a screw or the like (not shown) is screwed into the mounting hole 17 in the wheel mounting posture. The wheels are fixed so that the movement of the wheels in the axial direction is stopped. The mounting boss 12 is the rice transplanter 1 with respect to the equator 31 of the wheel.
4 is joined to the outside of the boss 4 a little, and a through hole corresponding to the above through hole 14 provided at the tip of the axle is provided at the outside of the rice transplanter of the boss. In this way, the wheels are directional when mounted on the axle.

Boss 1 for mounting total rubber wheel 10 for traveling in paddy field
Three spokes 18A are joined to the outer peripheral portion of No.2.
The three spokes 18A extend outward in the radial direction and form the disk portion 18 of the wheel. The radially outer portions of the spokes 18A are joined to an annular mounting member 20 to form a mounting portion 21 of the tire wheel, and the tire is integrally combined with the mounting portion 21.

In this way, the tire portion 26 is integrally combined with the wheel through the tire mounting portion 21. The tire portion 26 is a full rubber tire. The mounting members 20 and the spokes 18A are formed by processing a metal pipe such as iron or aluminum.

An auxiliary plate 15 is arranged on the inner side of the disk portion 18 in the radial direction. This auxiliary plate 15 is joined to the spokes 18A by welding, and
8 is reinforced.

As shown in FIG. 1, on the tread tread portion 26A of the tire portion 26, lugs 34 extend from the vicinity of the equator 31 to the outside in the axial direction of the wheel perpendicular to the equator 31, and are arranged alternately at equal intervals in the circumferential direction in the circumferential direction. It is set up. Further, a rib 36 extending in the wheel circumferential direction on the equator 31 is connected to an inner end portion 34A of the lug 34 on the equator side, and a portion surrounded by the adjacent lug 34 and the lug 34 on the same side with respect to the equator 31. Is a groove 38. The ribs 36 do not have to be on the equator, and may be arranged slightly offset from the equator to the left or right.

As shown in FIGS. 2 and 3, the lug 34
Has a mountain-shaped cross-sectional shape cut along a plane parallel to the equator 31 in which the side wall inclined surface 35 which is bilaterally symmetrical with respect to the center line of the lug is concavely curved in any cross section in the wheel axial direction. The width L of the top portion 34B of the lug 34 in the wheel circumferential direction is substantially the same as the rib 36.

Further, in the circumferential cross section of the lug 34, the inclination angles α1 and α2 with respect to the surface H including the wheel axis of the top end 34C of the side wall inclined surface 35 of the lug 34 gradually decrease toward the outside in the wheel axial direction. (Α1 <α2).

In the paddy running total rubber wheel 10 of this embodiment, the lug pattern of the tread tread portion 26A of the tire portion 26 is such that the center point P of the distance between the left and right lugs on the equator 31 (see FIG. 1).
(See FIG. 2), and the cross section of the lug 34 in the tire circumferential direction is symmetrical in the front-rear direction in the rotational direction, as shown in FIGS. 2 and 3. For this reason, since the left and right wheels can be shared by turning them over, there is no need to separately prepare the left and right wheels, which reduces equipment investment and the storage space for the wheels, and reduces the left and right wheels for paddy field travel. There is also no risk of mistakenly installing.

In the present embodiment, the spokes are used as the disc portion to improve the mud clogging property, and the tire portion extends from the vicinity of the equator to the outer side in the axial direction of the wheel perpendicularly to the equator and is staggered left and right. It has a number of lugs arranged at equal intervals in the circumferential direction, and the lug has a cross-section that is cut parallel to the equator and is substantially left-right symmetric with respect to the center line of the lug in any cross section in the wheel axial direction. Therefore, there is an excellent advantage that there is no left / right division and only one type is required.

As shown in FIG. 7, the inner diameter side of the total rubber tire 26 is formed by a protrusion 25 having a substantially acute angle in a sectional shape taken along a plane including the tire axis. The wheel of the present embodiment has smooth mud-removing surfaces 25A and 25B on the inner diameter side of the tire portion, thereby forming a protrusion 25 having a tip angle θ of 90 degrees. Due to this protruding portion, the mud can be easily dropped in combination with the space between the spokes, and mud can be easily dropped. The tip angle θ of the protrusion 25 is 50 degrees to 1
00 degrees is preferable, and 60 degrees to 90 degrees is more preferable.
If it is less than 50 degrees, the cross-sectional height extending to the inner diameter side of the entire rubber tire becomes high, and the effect of sludge removal becomes small, and if it exceeds 100 degrees, mud easily rides and the sludge removal property becomes insufficient.

In the paddy field total rubber wheel 10 of this embodiment, since the equatorial side end portion 34A of the lug 34 is connected to the rib 36 extending in the wheel circumferential direction, the skid resistance is improved, and the front wheel is particularly good. The straightness can be obtained.

In the paddy field total rubber wheel 10 of this embodiment, in the circumferential cross section of the lug 34, the inclination angle α1 of the side wall inclined surface 35 of the lug 34 with respect to the surface H including the wheel axis of the tread side end 34C, Since α2 gradually decreases from the equator toward the outer side in the axial direction (α1 <α2), the groove 38
The width at the bottom of the wheel becomes wider from the equator 31 toward the outer side in the axial direction of the wheel. As a result, soil is smoothly discharged, mud is less likely to be clogged, and traction is improved.

In the above embodiment, the inclined surface 35 of the lug 34 is used.
Has a concave mountain shape, and the width L of the top portion 34A of the lug 34 in the wheel circumferential direction is constant, but instead of this, as shown in FIGS. 8 and 9, the inclined surface 35 of the lug 34 may be a straight line. Well, the wheel circumferential width L of the top portion 34B of the lug 34
A configuration may be adopted in which 1 and L2 are gradually reduced from the equator side toward the outside in the axial direction of the wheel (L1 <L2).

In this case, the lug 3 is rotated by the rotation of the wheels.
When 4 steps into the soil, mud enters between the rugs 34 and the equator 3
Although it is extruded outward from the first side, the widths L1 and L2 of the top portion 34B of the lug 34 in the wheel circumferential direction gradually decrease toward the outer side in the axial direction (L1 <L2).
The adjacent lugs 34 on the same side and the groove 38 surrounded by the lugs 34 become wider toward the outside from the equator 31 side, and as a result, soil is easily discharged from the side of the tread tread 28, Mud clogging is difficult and traction is improved.

Reference numeral 37 (see FIGS. 4 and 5) shown in FIGS. 1 and 6 is a notch step portion provided in the rib 36, and the outer periphery of the rib 36 is formed into a block. It can be used as an aid when overcoming a foreign object.

[Test Example] In order to confirm the effects of the present invention, a total rubber wheel for paddy field traveling (invention products 1 and 2) of the present invention,
A conventional pneumatic tire wheel for paddy field running (conventional product 1) and a total rubber wheel for paddy field running with disk-shaped disc (comparative product 1) were manufactured by the use shown in Table 1, and a mud removal test was conducted for each. The results are shown in Table 1.

The mud removal test was carried out in a paddy field 5 days after scratching, and the depth to the tiller was 150 mm to 200 mm.
So, the soil was a little viscous and easy to stick.

[0037]

[Table 1]

From the results shown in Table 1, the total rubber wheels for traveling in paddy fields of the present invention (invention products 1, 2) need only one kind of tire and have better mud-removing property than the pneumatic tire. It is clearly superior to disc-shaped discs.

In the paddy field traveling total rubber wheel according to the first aspect, since the circumferential cross section of the lug of the tread surface is symmetrical in the longitudinal direction, the left and right wheels can be shared by turning over. It is excellent in economics that there is no classification and only one type is required. In addition, since the disc type is a spoke type, mud is unlikely to adhere to the total rubber tire mounting part due to the space between the spokes, improving mud removal performance. It has the effect of improving traction.

According to a second aspect of the present invention, there is provided a rubber wheel for traveling paddy fields according to the first aspect of the present invention. Combined with the space between them, it has excellent mud-breaking properties and has the effect of improving mud-removing properties.

According to a third aspect of the present invention, the paddy field traveling total rubber wheel of the present invention is the paddy field traveling total rubber wheel of claim 1, wherein the equator side end of the lug is connected to a rib extending in the tire circumferential direction. Therefore, in addition to the above effects, there is an excellent effect that skid resistance is less likely to occur and good straightness can be obtained.

According to a fourth aspect of the present invention, the paddy field traveling total rubber wheel according to the present invention is the paddy field traveling total rubber wheel according to the first aspect, and when the lug steps into the soil by the rotation of the wheel, mud enters between the rugs. Therefore, it is necessary to discharge this mud, but since the circumferential width of the tread tread of the lug is gradually reduced toward the outside in the axial direction of the tire, the groove enclosed between the lugs is located outside the equator side in the axial direction. As a result, the soil becomes wider as it goes to, and as a result, the soil is discharged smoothly, mud is less likely to be clogged between the rugs, and traction is improved.

According to a fifth aspect of the present invention, in the paddy field traveling total rubber wheel of the present invention, the paddy field traveling total rubber wheel of the first aspect includes a tire shaft center of a side wall inclined surface of the lug in a circumferential cross section of the lug. Since the inclination angle with respect to the surface gradually decreases toward the outer side in the tire axial direction, the width at the bottom of the groove between the lugs increases from the equator toward the outer side in the tire axial direction, resulting in smooth soil removal. It is carried out, and the groove portion is less likely to be clogged with soil, and the traction performance is improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a tread pattern of a paddy field total rubber wheel according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 1;

FIG. 4 is a cross-sectional view taken along a plane parallel to the wheel circumferential direction, showing a vehicle mounted state of a paddy field total rubber wheel according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along a plane parallel to a wheel circumferential direction, showing a vehicle mounted state of paddy field traveling total rubber wheels according to another embodiment of the present invention.

6 is a sectional view taken along line 5-5 of FIG.

7 is a partially enlarged cross-sectional view of FIG.

FIG. 8 is a plan view showing a tread pattern of a paddy field total rubber wheel according to another embodiment of the present invention.

9 is a sectional view taken along line 9-9 of FIG.

FIG. 10 is a plan view showing a tread pattern of a paddy field total rubber wheel of a conventional example.

FIG. 11 is a sectional view taken along line 11-11 of FIG. 10;

[Explanation of symbols]

 10 Paddy Wheel 12 Mounting Boss 14 Rice transplanter 14A Axle 18 Disc part 18A Spoke 20 Tire mounting member 21 Tire mounting part 26 Tire (part) 28 Tread tread part 31 Equator 34 Lug 34B Lug top 36 Rib 38 Groove part

Claims (5)

[Claims] 1. A boss for mounting on an axle, a plurality of spokes joined to the mounting boss and extending outward in the radial direction, and a tire mounting portion provided on the outer side in the radial direction of the spoke.
And a total rubber wheel for traveling in paddy field, which is formed by integrally combining all rubber tires to the mounting portion, wherein a large number of tires are provided at substantially equal intervals in the circumferential direction extending in the axial direction on the tread surface of the tire. The cross-sectional shape of the lug taken along a plane parallel to the equator is substantially symmetrical with respect to the center line of the lug in any cross section in the tire axial direction. Rubber wheels. 2. The paddy field according to claim 1, wherein the all-rubber tire is provided on its inner diameter side with a projecting portion whose tip portion has a substantially acute angle in a sectional shape taken along a plane including a tire axis. Total rubber wheels for traveling. 3. The equator-side inner end of the lug is connected to a rib extending in the tire circumferential direction.
Total rubber wheels for paddy traveling described in. 4. The circumferential width of the lug is gradually reduced toward the outer side in the tire axial direction.
Total rubber wheels for paddy traveling described in. 5. The paddy field according to claim 1, wherein the inclination angle of the side wall inclined surface of the lug with respect to the surface including the tire axis in the circumferential cross section of the lug gradually decreases toward the tire axial direction outer side. Total rubber wheels for traveling.