JPS6347521Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an agricultural wheel with lugs and blades used in rice transplanters and the like.

(Prior art) As shown in Japanese Utility Model Application Publication No. 54-51127, agricultural wheels are designed so that when rotating in the forward direction, they come into contact with a wider paddy field surface and generate a strong traction force.
A plurality of slats are provided, the slats being oriented at an angle of e.g. 30° to the wheel line in order to catch more water, mud and plow and to obtain forward and upward reaction forces. It is sloped with . Also,
The leading surface of the lugs provided between the blades also has an inclined surface of approximately 30° in order to increase the forward reaction force when the blade moves forward.

In addition, the blade plates are required to have strength to obtain traction and flexibility to shake off mud, so the wall thickness is gradually thinned from the root of the wing to the left and right tips, and ribs are added to the leading side when reversing. We have set up some. The backward leading surface formed by the blade root or rib has an inclination angle with respect to the ring body radiation that is equal to or smaller than that of the forward leading surface of the vane.

(Problem that the invention aims to solve) When the wheels are reversed to go backwards, contrary to forward movement, the vanes penetrate into the paddy field, dig into the tiller, and lift up a large amount of mud. Move like this. If the forward leading surface of the lug is an inclined surface that is almost the same as the forward leading surface, the forward reaction force will be large, but the upward reaction force will not be so large.
It is difficult to solve the problem that the effect of reducing the impingement of the slats is small, that the wheels do not run smoothly backwards, and that the slats lift up a lot of mud.

In addition, blades with wide wings encounter a lot of resistance when thrusting into the paddy field surface, so they tend to break at the base.Thickening the blades or providing ribs can prevent this damage to some extent, but If the root part is thickened, even though the outer tips on both sides of the wing gradually become thinner, they cannot be made very thin, resulting in decreased flexibility, and even if ribs are provided, breakage will occur at the connection between the rib and the blade plate. This may occur.

(Means for solving the problem) The present invention is to form the blade root of the blade plate thicker in a wider range than the rib, and to create a step between the blade root and the outer tips on both sides of the blade. The above-mentioned problems of the prior art can be solved by forming the outer tips of both sides of the blade to be thin, and by setting the rearward leading surface of the rib to a larger angle of inclination than the forward leading surface of the blade plate. This is what I did.

That is, the specific configuration of the problem solving means in the present invention is that a plurality of lugs and vanes having wings projecting outward on both sides and in a radial direction are provided at intervals in the circumferential direction on the outer periphery of the wheel body. , a rib forming a backward leading surface is provided on the backward leading side of the vane plate, the backward leading surface of the lug is formed to have a larger inclination angle with respect to the wheel body radiation than the forward leading surface, and the forward leading surface of the vane plate is formed so as to form a backward leading surface of the lug. In an agricultural wheel formed to have approximately the same inclination angle as the forward-moving leading surface, the blade plate has a blade root portion wider than the rib that bulges toward the backward-moving leading side to be thick, and a thin wall plate extending from the blade root portion through a stepped portion. Plate-shaped outer tips on both sides of the blade are formed, and the backward leading surface formed by the rib has a larger inclination angle with respect to the ring body radiation than the forward leading surface of the vane plate.

(Function) When the wheel 1 rotates backward, the blade plate 10 and the lug 11
The backward leading surfaces 10a and 11c are the forward leading surfaces 10
It touches the ground before e and 11b, and generates a large buoyant force at inclination angles θ4 and θ2, respectively, which are larger than those of the advancing leading surface 11b, effectively preventing the vane plate 10 from impaling,
The necessary traction force is obtained by the blade plate 10 and smooth backward running is performed. The rigidity of the blade plate 10 is increased by the rib 10c formed on the reverse leading side and the thick root portion 10b, and in addition to this, the thick root portion 10
Since the width of b is wider than the rib 10c, damage prevention of the vane plate 10 is improved. Feather plate 10
A stepped portion 10g is formed between the outer tip portions 10f of the wing on both sides and the thick root portion 10b, and the thickness of the outer tip portion 10f of the wing on both sides is not affected by the thickness of the root portion 10b. , is set to the required thin wall, has the flexibility necessary for brushing off mud, and deforms elastically when coming out of the mud.

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

The wheel 1 has four radial spokes 3 welded to a central boss 2, which are reinforced with flanges 4, and a rim 5 welded to the tips of the four spokes 3 and coated with a rubber material. It forms the outer periphery of the wheel 7, and when it is attached to a rice transplanter or the like and moves forward, the arrow 8
Rotate in the direction.

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

The lug 11 is a substantially trapezoidal protrusion that protrudes in the radial direction from the annular portion 7a of the outer peripheral portion 7, and the outer peripheral surface 11
a, a forward leading surface 11b, and a reverse leading surface 11c. When the wheel 1 rotates in the forward direction 8, the forward leading surface 11b carries water, water, etc. in advance of the reverse leading surface 11c.
This is a surface that comes into contact with the mud and the tiller β, and is an inclined surface having an inclination angle θ1 of approximately 30° with respect to a radiation α passing through the center of the wheel 1.

As shown in FIG. 5, when the advancing leading surface 11b contacts the tiller β at an angle of λ1, it receives a reaction force A1 from the tiller β, and the reaction force A1 is an upward component force A2.
and horizontal component force A3 are generated.

The reverse leading surface 111c is a surface that precedes when the wheel 1 rotates in the reverse direction (in the opposite direction to the arrow 8),
It is an inclined surface with an inclination angle θ2 of approximately 45° with respect to the radiation α, and when the inclination angle θ2 is around 45°, water,
It comes into contact with the mud and the tiller β in a nearly horizontal position.

As shown in FIG. 5, when the backward leading surface 11c contacts the tiller β at an angle of λ2, it receives a reaction force B1 from the tiller β. The reaction force B1 is the upward component force B2
and horizontal component force B3 are generated. Angle λ2 is angle λ1
If it is 15 degrees smaller than that, the component force B2 on the backward leading surface 11c will be sufficiently larger than the upward component force A2 on the forward leading surface 11b, and since θ1<θ2, the backward leading surface 11c will be larger than the upward component force A2 on the forward leading surface 11b. The wheel 1 receives a large upward force from the lug 11 when moving backward.

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, and the advancing leading surface 1 at approximately the same angle.
0e is formed. This blade plate 10 has an annular portion 7
It protrudes largely to the left, right, and inward from a, and protrudes outward to approximately the same extent as the lug 11, and a reinforcing bulge (blade root) 10b and ribs 10c are formed on the reverse leading surface 10a side. ing.

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.
Similarly to the backward leading surface 11c, the plowing plate β comes into contact with the plowing plate β in a nearly horizontal position, that is, at an angle λ2,
It has the effect of increasing the upward reaction force.

As shown in FIG. 4, the bulging portion 10b bulges toward the reverse leading side and has a thick base portion of the vane plate 10, and its width W is wider than the rib 10c. A stepped portion 10g is formed between the wing plate 10b and the outer tip portions 10f on both sides of the blade, and with this stepped portion 10g as a boundary, the outer tip portion 10f side on both sides of the blade has a highly flexible thin wall. It is plate-shaped.

When the wheel 1 moves forward, the vane plate 10 generates a main upward reaction force, and the forward leading surfaces 10e and 11b of the vane plate 10 and the lug 11 catch water, mud, and the plow β, thereby creating a propulsive force. get. In order to perform this kind of action optimally, the inclination angle θ3 of the vane plate 10 and the inclination angle θ1 of the advancing leading surface 11b are adjusted to the radiation α.
Most preferably, the angle is about 30°.

On the other hand, when moving backward, the blade plate 10 penetrates water and mud and tries to bite into the tiller β, so the propulsive force is only by the action of the blade plate 10, and the lug 11 moves backward. A large upward reaction force is generated by the leading surface 11c and the backward 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. In order to best achieve this effect, it is most preferable that the inclination angles .theta.2 and .theta.4 are larger than the inclination angles .theta.1 and .theta.3, particularly about 45 DEG. Incidentally, the inclination angles θ1, θ2, θ3,
θ4 changes depending on the hardness of the tiller β, etc., and is not limited to the angle shown in the above embodiment.

(Effects of the invention) According to the invention described in detail above, a rib is provided on the rearward tip side of the vane plate, and the reverse leading surface formed by this rib is a blade having approximately the same inclination angle as the forward leading surface of the lug. Since the angle of inclination to the wheel body radiation is set larger than the forward leading surface of the plate, the blade plate also generates a large buoyant force when the wheels rotate backwards, effectively preventing the blade plate from sticking into the paddy field surface. The vanes provide the necessary traction and allow for smooth reversing. In addition, the wing plate has a thick wall that is wider at the root of the wing than the rib and bulges toward the reverse leading side, so the rib and the root of the wing have sufficient rigidity to generate the necessary traction force on the blade. In addition, damage to the vicinity of the wing root can be prevented, and since a step is formed between the wing root and the outer tips on both sides of the wing, the wall thickness of the outer tips on both sides of the wing can be reduced. can be made as thin as required without being affected by the wall thickness of the root of the blade, increasing the rigidity of the root of the blade and increasing the flexibility of the outer tips on both sides of the blade, reducing the amount of mud that adheres to the blade. It is possible to make the removal more reliable.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view, Fig. 2 is a partial side view, Fig. 3 is a perspective explanatory view of the lug, Fig. 4 is a partial front view, and Fig. 5 is a partial side view. FIG. 6 is an explanatory diagram showing the state of reaction force applied to the lug when moving forward and when moving backward, respectively. 1...Wheel, 5...Rim, 7...Wheel outer circumference,
10... Vane plate, 11... Lug, 11b... Forward leading surface, 10a, 10d... Reverse leading surface, 10b
...Bulging part, 10c...Rib, 10f...Blade bilateral outer tip, 10g...Step part, θ...Inclination angle, α
...Radiation, β...Plowing board.

Claims (1)

[Claims for Utility Model Registration] A plurality of lugs and vanes having wings projecting outward on both sides and radially inward are provided on the outer periphery of the wheel body, spaced apart from each other in the circumferential direction, and the vanes are arranged in a backward-leading manner. A rib forming a backward leading surface is provided on the side, the backward leading surface of the lug is formed at a larger inclination angle with respect to the wheel body radiation than the forward leading surface, and the forward leading surface of the vane plate is substantially the same as the forward leading surface of the lug. In an agricultural wheel formed at an inclined angle, the blade plate has a root portion wider than the rib, which bulges out toward the rearward and leading side, and is thickened, and from the root portion of the blade, through a stepped portion, a thin plate-shaped blade is formed on the outside of both sides of the blade. 1. An agricultural wheel characterized in that a backward leading surface formed with a front end portion and a rib is set at a larger angle of inclination with respect to the wheel body radiation than a forward leading surface of a vane plate.