JP2010047161A - Wheel for agricultural use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel for agricultural use having excellent traction and buoyancy. <P>SOLUTION: An inner blade lug 7 located on the inner side of the tire axial direction B and an outer blade lug 8 located on the outer side of the tire axial direction are provided on a tire body 6 formed of a rubber-like elastic material in an annular shape. The inner side blade lug 7 and the outer side blade lug 8 are formed in an inclined shape so as to be shifted in the advancing rotational direction forward A1 toward the tire centripetal direction W. The angle Y of inclination of the inner blade lug 7 with respect to the tire centripetal line X is set to be smaller than the angle Z of inclination of the outer blade lug 8 with respect to the tire centripetal line X. The angle Y of inclination of the inner side blade lug 7 is set to be 15-30°, and the angle Z of inclination of the outer side blade lug 8 is set to be 30-55°. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an agricultural wheel with a blade lug that is employed in a traveling portion of an agricultural vehicle (paddy field work machine) such as a rice transplanter, a water-tank direct spreader, or a substitute scraper.

Conventionally, agricultural wheels adopted in traveling parts such as rice transplanters are equipped with solid rubber tires fixed to the rim so as to cover an annular rim, and the rear wheels used for Fukada are: In addition to preventing the aircraft from sinking, the solid rubber tire is provided with a large plate-like blade lug (blade plate) in order to generate traction force (see Patent Document 1).
This blade lug is formed in an inclined shape that moves forward in the forward rotation direction of the tire as it goes in the centripetal direction of the tire.
JP-A-2005-193824

In the conventional agricultural wheel, the smaller the angle of inclination of the blade lug with respect to the tire centripetal line, the greater the traction force, but the lower the float action (buoyancy generation action) to prevent the aircraft from sinking, Fukada running will be worse.
On the contrary, as the inclination angle of the blade lug with respect to the tire centripetal line is increased, the above-described float action is increased, but as a result, the traction force is reduced, and the Fukada running performance is deteriorated.
Therefore, at present, the inclination angle of the blade lug and the size of the blade lug are designed while ensuring a delicate balance between the traction action and the float action, but both the traction action and the float action are fully demonstrated. Has its limits.

In addition, when planting seedlings in paddy fields with a rice transplanter, the plate-like blade lag scoops up mud when it comes out of the paddy mud, but the blade lag with a smaller inclination angle with respect to the tire centripetal line has a larger amount Although the mud is lifted to a relatively high position (see FIG. 5), the mud tends to be easily dropped onto the seedlings already planted.
Then, an object of this invention is to provide the agricultural wheel which can eliminate the said problem.

The technical means taken by the present invention in order to solve the above technical problem is that a tire body formed in an annular shape with a rubber-like elastic material has an inner blade lug positioned on the inner side in the tire axial direction and an outer side in the tire axial direction. An outer blade lug that is positioned, and the inner blade lug and the outer blade lug are formed in an inclined shape that moves forward in the forward rotation direction of the tire as it goes in the centripetal direction of the tire,
The inclination angle of the inner blade lug with respect to the tire centripetal line is configured to be smaller than the inclination angle of the outer blade lug with respect to the tire centripetal line, and the inclination angle of the inner blade lug is set to 15 to 30 °. The inclination angle is 30 to 55 °.

  Further, the inner blade lug and the outer blade lug are juxtaposed in the tire axial direction with the tire body interposed therebetween, and the outer end surface in the tire radial direction that serves as a contact surface between the inner blade lug and the outer blade lug Both the position in the direction and the distance from the tire center may be the same.

According to the agricultural wheel of the present invention, the inner blade lug has a large inclination angle with respect to the tire centripetal line, so the traction action is large, and the outer blade lug has a large inclination angle with respect to the tire centripetal line, so the float action is large. By making the inclination angles of the blade lugs and the outer blade lugs different from each other and sufficiently exhibiting the traction action and the float action, it is possible to provide an agricultural wheel with good running performance.
Further, as shown in FIG. 4, the blade lug having a large inclination angle with respect to the tire centripetal line has a large angle with respect to the horizontal direction when the blade lug comes out of the mud, so that the blade lug is well removed. However, in the present invention, the inclination angle of the outer blade lug, which is the outer side of the wheel when the agricultural wheel is mounted on this machine such as a rice transplanter, is increased with respect to the tire centripetal line. It is possible to prevent a situation in which the mud is dropped on the seedling by lifting up the mud.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1-5, 1 is an agricultural wheel employ | adopted as the traveling part of paddy field machines, such as a rice transplanter.
1 and 4 show one side of the agricultural wheel 1, and FIGS. 2 and 5 show the other side of the agricultural wheel 1, but FIGS. 1 and 4 show the agricultural wheel 1 mounted on a rice transplanter or the like. FIG. 2 and FIG. 4 are views of the right agricultural wheel 1 as viewed from the left side (inside). FIG. 2 and FIG. 4 are views of the left agricultural wheel 1 as viewed from the left side (outside). FIG. 3 is a plan view of the main part of the agricultural wheel 1.

The agricultural wheel 1 is a tire made of a solid elastic tire (solid rubber tire) fixed by baking a rubber-like elastic material on a rim (not shown) formed in an annular shape by a pipe material so as to cover the entire rim. 2 is provided.
The agricultural wheel 1 includes a mounting boss 3 positioned on the center (O) side of the tire 2, a plurality of spokes 4 extending radially from the mounting boss 3 and connected to the rim, the mounting boss 3 and A disc-shaped reinforcing plate 5 welded and fixed to the spoke 4, and the mounting boss 3 is mounted and fixed to the axle of a main machine (traveling vehicle) such as a rice transplanter, so that it is mounted on a rice transplanter or the like. The

The tire 2 includes an annular tire body 6 provided so as to cover the entire rim, and a large number of lugs 7, 8, 9 provided on the tire body 6 at intervals in the tire circumferential direction A. .
The lugs 7, 8, 9 are provided with a plate-shaped inner blade lug 7, a plate-shaped outer blade lug 8, and a trapezoidal block-shaped lug 9.
The inner blade lug 7 is located on the inner side in the tire axial direction B (left-right direction) of the tire body 6, and protrudes from the tire body 6 inward and outward in the tire radial direction C.
The outer blade lug 8 is located on the outer side in the tire axial direction B of the tire body 6 and projects outward from the tire body 6 and outward in the tire radial direction C.

The tire axial direction B inner side means that the farm wheels 1 are mounted on the left and right sides of the machine of a paddy field machine such as a rice transplanter, in other words, the farm wheels 1 in the left and right direction (in other words, the inner side of the machine in the left and right direction). Or the opposite side of the left and right agricultural wheels 1), and the outer side in the tire axial direction B is the left and right direction of the agricultural wheels 1 when the agricultural wheels 1 are mounted on both the left and right sides of this machine such as a rice transplanter. This is the side that is the outside (in other words, the laterally outward side of the machine, or the opposite side of the left and right agricultural wheels 1).
Further, the inner blade lug 7 and the outer blade lug 8 are juxtaposed in the left-right direction across the tire body 6, and the tire radial direction C outer end surface serving as the ground contact surface of the inner blade lug 7 and the outer blade lug 8. 7a and 8a are located in the same position in the tire circumferential direction A, and the distance in the tire radial direction C from the tire center O is the same distance.

Further, the portions of the inner blade lug 7 and the outer blade lug 8 that protrude outward from the tire body 6 in the tire radial direction C are connected, and the contact surfaces 7a and 8a of the inner blade lug 7 and the outer blade lug 8 are surfaces. It is continuous and continuous.
Therefore, it can be said that the inner part of the blade lug projecting in both sides of the tire axial direction B and the outer direction of the tire 2 is composed of the inner blade lug 7 and the outer part is composed of the outer blade lug 8.
Note that the inner blade lug 7 and the outer blade lug 8 may be provided in a position shifted in the tire circumferential direction A.

The inner blade lug 7 and the outer blade lug 8 that are paired on the left and right are provided in the tire body 6 at a plurality of sets (9 sets in the present embodiment) at regular intervals in the tire circumferential direction A. A plurality of (three in this embodiment) are provided between the blade lugs 7 and 8 adjacent in the tire circumferential direction A, and the grounding surface 11 of the block lug 9 and the grounding surfaces 7a and 8a of the blade lugs 7 and 8 The distance from the tire center O is formed with the same dimension.
Further, the inner blade lug 7 and the outer blade lug 8 are formed in an inclined shape that moves forward in the forward rotation direction A1 of the tire 2 as it goes in the centripetal direction W of the tire 2, and the tire of the inner blade lug 7 The inclination angle Y with respect to the centripetal line X is formed to be smaller than the inclination angle Z with respect to the tire centripetal line X of the outer blade lug 8.

The inclination angle Y of the inner blade lug 7 with respect to the tire centripetal line X is set to 15 to 30 °, and the inclination angle Z of the outer blade lug 8 to the tire centripetal line X is set to 30 to 55 °.
Specifically, the inclination angle of the inner blade lug 7 is set to 25 °, and the inclination angle of the outer blade lug 8 is set to 45 °. Alternatively, the inclination angle of the inner blade lug 7 is set to 15 °, and the inclination angle of the outer blade lug 8 is set to 55 °.
As shown in FIG. 5, when the inner blade lug 7 enters the mud, the angle with respect to the horizontal direction is small, so the traction force is not large. However, the traction force gradually increases as the agricultural wheel 1 rotates forward, and the mounting boss 3, the front surface of the inner blade lug 7 in the tire forward rotation direction A1 is perpendicular to the horizontal direction to maximize the traction force, and a large traction force is obtained by the inner blade lug 7.

Further, when the inner blade lug 7 comes out of the mud, the angle with respect to the horizontal direction is small (not inclined so much with respect to the horizontal direction), so the mud 12 is scooped up and the mud 12 is lifted to a relatively high position. Although the mud 12 is dropped, the mud 12 falls to the inside of the agricultural wheel 1, so there is no fear that it will fall on the seedling 13 in which the mud 12 is planted.
Further, as shown in FIG. 4, the outer blade lug 8 is relatively inclined with respect to the vertical direction until it enters the mud and comes out of the mud. Since the area of the surface that presses the mud is large, it exerts a float action that floats the wheel 1 from entering the mud until it comes out of the mud, especially when entering the mud, the angle with respect to the horizontal direction Small and has high buoyancy at the part.

Further, when the outer blade lug 8 is in the mud, there is not much resistance to the mud due to the effect of slip, and the traction force is not so much.
Also, when the outer blade lug 8 comes out of the mud, the angle with respect to the horizontal direction is large (relatively inclined with respect to the horizontal direction), so that the mud dropping of the blade lug 8 is good and the mud 12 is lifted up. The outer blade lug 8 is outside the wheel 1 when the agricultural wheel 1 is mounted on a machine such as a rice transplanter, so that the mud 12 is dropped onto the seedling 13 by the outer blade lug 8. That's not true.

As described above, in the agricultural wheel 1 of the present embodiment, the inner blade lug 7 exerts the traction effect and the outer blade lug 8 exhibits the buoyancy generation effect (the traction action and the float action are performed). Since it is generated in different parts), both traction and buoyancy can be fully exerted, the running performance in Fukada can be improved, and the mud 12 lifted by the blade lugs 7 and 8 is dropped on the seedling 13 There is no fear.
Next, Table 1 shows the results of testing the traction force and buoyancy of the agricultural wheels 1 with various changes in the inclination angles of the blade lugs 7 and 8.

The test was carried out with an actual vehicle with the agricultural wheels 1 mounted on a rice transplanter.
The traction force was measured by a load cell when the small tractor was towed by a rice transplanter traveling in a paddy field (Fukada or Asada).
The buoyancy was measured by the amount of settlement of the wheels when the rice transplanter travels through paddy fields.
Fukada running ability or Asada running ability was evaluated by the operator's feeling (evaluation of whether or not the operator proceeds as expected). The higher the numerical value, the better the running performance.

Moreover, the fall property of the mud to a planting part has shown that mud is not dropped on the seedling 13, so that a numerical value is high.
In Table 1, from Comparative Example 1, when the inclination angle of the inner blade lug and the outer blade lug is small, the traction force is large but the buoyancy is small. As a result, the Fukada running performance is poor, and from Comparative Example 5 When the inclination angle of the inner blade lug and the outer blade lug is large, the buoyancy is large but the traction force is small.
Further, from Examples 1 to 4, the inclination angle Y of the inner blade lug 7 is smaller than the inclination angle Z of the outer blade lug 8, and the inclination angle Y of the inner blade lug 7 is 15 to 30 °. It can be seen that by setting the inclination angle Z of 8 to 30 to 55 °, both the traction force and the buoyancy are good, and as a result, the Fukada running ability is improved and the mud dropping property to the planting part is good.

It is the principal part side view of the agricultural wheel which showed the inclination-angle of an outer blade | wing lug. It is the principal part side view of the agricultural wheel which showed the inclination angle of the inner side blade | lug lug. It is a top view of the principal part of an agricultural wheel. It is the side view which showed the mode in the agricultural field of the outer side surface of an agricultural wheel. It is the side view which showed the mode in the agricultural field of the inner surface of an agricultural wheel.

Explanation of symbols

6 Tire body 7 Inner blade lug 8 Outer blade lug 7a Ground contact surface of inner blade lug 8a Ground contact surface of outer blade lug A1 Tire forward rotation direction B Tire axial direction C Tire radial direction O Tire center W Tire centripetal direction X Tire Centering line Y Inclination angle of inner blade lug with respect to tire centering line Z Inclination angle of outer blade lug with respect to tire centering line

Claims (2)

An inner blade lug (7) positioned on the inner side in the tire axial direction (B) and an outer blade lug (8) positioned on the outer side in the tire axial direction (B) are formed on the tire main body (6) formed in an annular shape with a rubber-like elastic material. ), And the inner blade lug (7) and the outer blade lug (8) are inclined to move forward (A1) in the forward rotation direction of the tire (2) as it goes in the centripetal direction (W) of the tire (2). Formed into a shape,
The inclination angle (Y) of the inner blade lug (7) with respect to the tire centripetal line (X) is configured to be smaller than the inclination angle (Z) of the outer blade lug (8) with respect to the tire centripetal line (X). An agricultural wheel characterized in that the inclination angle (Y) of the blade lug (7) is 15 to 30 °, and the inclination angle (Z) of the outer blade lug (8) is 30 to 55 °.   The inner blade lug (7) and the outer blade lug (8) are juxtaposed in the tire axial direction (B) across the tire body (6). The inner blade lug (7) and the outer blade lug (8) The outer end surfaces (7a, 8a) in the tire radial direction (C) that serve as the contact surface of the tire) have the same distance from the tire circumferential direction (A) and the tire center (O). Item 1. Agricultural wheel according to Item 1.

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