JPH0133361Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an agricultural wheel used in a working machine such as a rice transplanter.

(Prior art) This type of wheel has an annular core coated with an elastic material such as rubber, as disclosed in Japanese Utility Model Application Publication No. 54-51127 or No. 47-12104. The outer circumferential portion of the elastic ring body is formed by the outer circumferential portion of the elastic ring body, and lugs and vanes are integrally molded on the outer circumferential portion of the ring body at predetermined intervals in the circumferential direction.
In order to obtain traction and buoyancy in mud, these vanes protrude from the circumferential surface of the wheel at least to both sides in the radial cross section of the wheel, protrude radially outward to the same height as the lugs, and It also protrudes inward.

Such blades require strength to obtain traction and flexibility to shake off mud, so the side portions are formed to become progressively thinner from the root to the tip.

Furthermore, Japanese Utility Model Publication No. 53-52219 discloses a structure in which a vane plate is integrally provided on the left and right sides of a lug, and the ground contact width of the vane plate is narrower than that of the lug. ing.

(Problem to be Solved by the Invention) The blade plate is provided in order to generate a strong traction force by coming into contact with a wider paddy field surface when rotating in the forward direction.

Therefore, in order for this vane to catch more water, mud and plowing soil to obtain forward and upward reaction force, the vane has its inner end between the center of the wheel and the outside of the vane. It is provided so as to be inclined so as to be spaced apart toward the forward advancing side with respect to the radiation line connecting the ends. In order to obtain strong traction force, the rigidity of the vane must be increased.

However, when the wheels are reversed to go backwards,
In contrast to forward movement, the blades penetrate into the paddy field, bite into the tiller, and move to lift up a large amount of mud. Therefore, there is a problem in that a large amount of mud is lifted up when reversing, making it impossible to run smoothly in reverse.

To solve this problem, the rigidity of the blades can be weakened to deform the blades and remove mud.

However, as mentioned above, when moving forward, the blades are required to have rigidity, which creates a trade-off problem.

That is, in the prior art described in the above-mentioned Japanese Utility Model Application Publication No. 54-51127 and Japanese Utility Model Application Publication No. 47-12104, since the wall thickness of the vane plate becomes gradually thinner, the above-mentioned problems when traveling forward and backward can be solved. To solve this problem, it was necessary to make the wall thickness intermediate, and it was not possible to fully satisfy both requirements.

In addition, in the blade plate described in the above-mentioned Japanese Utility Model Publication No. 53-52219, the blade plate is not provided at an angle, so there is no difference when moving forward and backward, but the thickness of the blade plate suddenly increases from the outer side of the wheel body. Since the blades were thinner and protruded outward, stress was likely to be concentrated at the base of the blades, which could cause them to break. Additionally, since these blades have high rigidity to obtain traction force, they are difficult to deform, so there is a problem in that when mud adheres to them, it is difficult to remove them.

Therefore, the object of the present invention is to provide an agricultural wheel having the above-mentioned inclined vanes, which can obtain sufficient traction force when moving forward, and which can easily remove mud when moving backward. do.

(Means for Solving the Problems) In order to achieve the above object, the present invention takes the following measures. That is, the feature of the present invention is that the annular core material 5 is coated with an elastic body to form an elastic ring body outer peripheral part 7, and plate-shaped blades are arranged on the ring body outer peripheral part 7 at predetermined intervals in the circumferential direction. A plate 10 is integrally molded, and the vane plate 10 is inclined so that its inner end is spaced toward the forward forward side with respect to the line connecting the center of the wheel and the outer end of the vane plate 10, and , in an agricultural wheel in which the left and right sides of the vane plate 10 protrude to the left and right sides of the wheel body outer circumferential portion 7, the blade plate 10 has a thickness that bulges toward the backward and leading side at the root portion with the wheel body outer circumferential portion 7. Meat bulge 1
0b, and the bulging portion 10b extends outward from the right and left of the ring body outer circumferential portion 7 to form a thick blade plate root portion 1.
3A, and from the left-right tip of the swollen portion 10b to the left-right tip of the blade plate 10, a thin blade tip 13B is formed, and the boundary between the root portion 13A and the tip 13B is thin. Suddenly changing stepped section 13C
It is located at the point where it is formed.

(Function) The agricultural wheel of the present invention is used in paddy fields. The blades of this wheel are inclined so that their inner ends are spaced apart toward the forward leading side with respect to the line connecting the center of the wheel and the outer edge of the blades, so that the wheel rotates forward. When this happens, the blades touch the ground in a nearly horizontal position, creating an upward reaction force (buoyant force). Then, the slats are exposed to water due to the forward leading surface.
Propulsion is obtained by pulling on mud and plow.

In order to obtain sufficient buoyancy and traction force during this forward movement, the blades must not be deformed. In the present invention, a bulge is provided on the backward/leading side of the base of the vane plate, and this bulge extends further outward from the left and right outer surfaces of the same part of the wheel body to form a thick root. Because I am doing
The blades have high rigidity and can provide sufficient traction and buoyancy. Note that the tips of the vanes are thin and deform, but the traction force is carried by the base portions, so sufficient traction force can be obtained. Then, when the thin-walled tip part leaves the tiller, it rapidly recovers its elasticity and shakes off the mud that has adhered to the vane.

On the other hand, when moving backward, the blades penetrate water and mud and bite into the tiller, lifting mud and increasing the amount of mud attached. At this time, the tip of the blade plate is formed with a thin wall, and the boundary with the thick root part is formed into a stepped part where the wall thickness changes rapidly, so that the blade plate separates from the tiller. At this time, the tip suddenly returns to its elastic state, vibrating violently from the step to the tip, and brushing off the mud that has adhered to the vane.

That is, the root portion of the vane of the present invention functions as a portion for obtaining traction force, and the tip portion functions as a portion for removing mud.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In Fig. 3, the wheel 1 has four radial spokes 3 welded to a central boss 2, which are reinforced with flanges 4, and a rim (an annular core) welded to the tips of the four spokes 3. The outer peripheral part 7 of the ring body is formed by covering the ring member 5 with a rubber material, and it rotates in the direction of arrow 8 when it is attached to a rice transplanter or the like and moves forward.

On the outer circumferential portion 7 of the ring body, vanes 10 are arranged at 45° intervals.
Lugs 11 are integrally formed between the blades 10 at intervals of 15°.

As shown in FIG. 2, the lug 11 is a substantially trapezoidal protrusion that protrudes radially from the outer peripheral portion 7, and has an outer peripheral surface 11a, a forward leading surface 11b, and a reverse leading surface 11.
It has c. The forward leading surface 11b is a surface that comes into contact with water, mud, and the tiller β before the reverse leading surface 11c when the wheel 1 rotates in the forward direction 8, and is a surface that comes into contact with water, mud, and the tiller β when the wheel 1 rotates in the forward direction 8. It is an inclined surface with an inclination angle θ1 of approximately 30°.

The wheel 1 rotates in the forward direction, and the forward leading surface 11
When b comes into contact with the tiller β, it receives a reaction force from the tiller β. The reaction force produces an upward component (buoyant force) and a horizontal component (traction force).

The reverse leading surface 11c indicates that the wheels 1 are in the reverse direction (arrow 8
It is a surface that precedes when rotating in the opposite direction), and is an inclined surface with an inclined surface θ2 of approximately 45 degrees with respect to the radiation α. If the angle of inclination θ2 is around 45 degrees, water,
It comes into contact with the mud and the tiller β in a nearly horizontal position.

The wheel 1 rotates in the reverse direction, and the reverse leading surface 11
When c comes into contact with the tiller β, it receives a reaction force from the tiller β. The reaction force produces an upward component (buoyant force) and a horizontal component (traction force).

The vane plate 10 is formed into a flat plate shape or a curved plate shape protruding toward the advancing leading surface side, and has an inclination angle θ3 of approximately 30° with respect to the radiation α. This feather plate 1
0 largely protrudes laterally and inwardly from the annular portion 7a, and protrudes outward to approximately the same extent as the lug 11, and a reinforcing bulge 10b and ribs 10c are formed on the backward leading surface 10a. .

As shown in FIG.
It forms A. A thin blade tip portion 13B is formed from the left-right tip of the bulging portion 10b to the left-right tip of the blade plate 10. The boundary between the root portion 13A and the tip portion 13B is formed into a stepped portion 13C whose thickness changes rapidly.

That is, the blade plate 10 is formed with a reinforcing bulge portion 10b that bulges toward the reverse leading surface 10a, so that the root portion 13A of the left and right side portions 13 is thicker than the tip portion 13B. In the middle is step 1
3C, the root portion 13A is continuous and integral with the rib 10c to increase rigidity, and the tip portion 13B
It becomes thinner rapidly due to the stepped portion 13C, and its flexibility is enhanced.

Similar to the lug 11, the reinforcing rib 10c is formed with a backward leading surface 10d which is an inclined surface θ4 at an angle of about 45 degrees with respect to the radiation α.
Similar to the backward leading surface 11c, it abuts against the tiller β even in a more horizontal posture, and has the effect of increasing the upward reaction force.

When the wheel 1 moves forward, the vane plate 10 generates a main upward reaction force, and the forward leading surface 11b of the vane plate 10 and the lug 11 attracts water, mud, and the plow β to obtain propulsive force. .

During this forward movement, since the blade root portion 13A is formed as a thick wall portion that protrudes outward in the left-right direction from the ring body outer peripheral portion 7, the blade root portion 13A has high rigidity.
Since it does not deform against traction force, sufficient traction force can be obtained.

On the other hand, since the vane plate tip 13B is formed thin with a stepped portion 13c whose thickness changes suddenly,
Although this portion is deformed and does not exert sufficient traction force, the traction force is carried by the root portion 13A, so the tip portion 13B may be deformed. This tip 13B
When separated from the tiller β, the blade rapidly restores its elasticity and serves to shake off the mud adhering to the vane plate 10.

On the other hand, when moving backward, the blade plate 10 enters the water and mud and tries to bite into the tiller β, so the action of the blade plate 10 alone is sufficient for the propulsion force, and the lugs 11 A large upward reaction force is generated by the backward movement leading surface 11c and the backward movement leading surface 10d of the reinforcing rib 10c, and this reaction force causes the blade plate 10 to
The biting into the tiller β is reduced.

However, since the blade plate 10 bites into the tiller β more than when moving forward, more mud is lifted up and more mud is attached. When the vane board 10 leaves the tiller β, the vane board tip 13B is formed thin, and the boundary with the thick root part 13A is formed as a stepped part 13C in which the wall thickness changes rapidly. The tip portion 13B vibrates violently due to elastic restoration and shakes off the mud adhering to the blade plate 10.

(Effects of the invention) According to the invention, the functions are shared between the base of the vane for obtaining traction and the tip of the vane for removing mud. Now I can solve problems.

In other words, in the conventional type, in order to solve the problem of the double back plate thickness, the wall thickness of the blade plate must be set to a value intermediate between the two, and the traction force and mud removal are sufficiently satisfied. I couldn't do it.
However, according to the invention of the present invention, each part of the vane is made to share the functions of traction force and mud removal, so that the traction force and mud removal are sufficiently satisfactory.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of the main part, FIG. 2 is a partial side view, and FIG. 3 is a side view of the whole. 1...Wheel, 5...Rim (annular core material), 7...
Ring body outer periphery, 10... vane plate, 10a... bulge, 11b... advancing leading surface, 11c, 10a...
Reverse leading surface, 13... side part, 13A... root part,
13B...Tip, 13C...Step, θ...Inclination angle, α...Radiation.

Claims (1)

[Claims for Utility Model Registration] An annular core material 5 is coated with an elastic body to form an elastic ring body outer circumferential portion 7, and plate-shaped vanes 10 are provided at predetermined intervals in the circumferential direction on the ring body outer circumferential portion 7. The vane plate 10 is integrally molded, and its inner end is connected to the center of the wheel body.
The vane plate 10 is provided so as to be inclined so as to be spaced apart toward the forward leading side with respect to the line connecting the outer end of the vane plate 10.
In an agricultural wheel in which the left and right sides of the wheel body protrude to the left and right sides of the wheel body outer circumferential portion 7, the vane plate 10 has a thick bulge that bulges toward the backward and leading side at the root of the wheel body outer circumferential portion 7. Part 1
0b, and the bulging portion 10b extends outward from the right and left of the ring body outer peripheral portion 7 to form a thick blade root portion 1.
3A, and from the left-right tip of the swollen portion 10b to the left-right tip of the blade plate 10, a thin blade tip 13B is formed, and the boundary between the root portion 13A and the tip 13B is thin. Suddenly changing stepped section 13C
An agricultural wheel characterized by being formed as follows.