JPH07223403A - Wheel for agriculture use - Google Patents

Abstract

PURPOSE:To prevent vibration in the vertical direction and sway in the horizontal direction, to secure sufficient traction force, to improve a straight advancing property, and to prevent sinking on the soft ground. CONSTITUTION:In a wheel for agricultural in which multiple lugs 7 are arranged at equal intervals in the circumference direction on an elastic solid/hollow wheel body 5 made of elastic material such as rubber, the lug 7 is formed of a circumference directional lug part 7a arranged in the approximately central part in the wheel width direction and axial directional lugs 7b projected on the wheel width direction both side faces of the circumference directional lug part 7a, and the lug part 7a and the lug parts 7b are integrally formed into an approximately cross shape in a plan view, while an outer circumference tread face of the circumference directional lug part 7a is projected further in the diameter external direction than the axial directional lug parts 7b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cored or pneumatic agricultural wheel used for agricultural machines such as management machines, rice transplanters, binders or combines.

[0002]

2. Description of the Related Art Generally, as this type of agricultural wheel, there are a rubber-baked wheel in which rubber is baked on a core material having a circular rod or tube, and a pneumatic wheel, both of which obtain traction and buoyancy in mud. Therefore, a large number of blade lugs are provided at equal intervals in the circumferential direction, and one or more angular lugs are provided between the blade lugs.

The circumferential distance between the vane lugs and the square lugs, that is, the distance between adjacent lugs, is much larger than the circumferential length of each lug, and each lug intermittently comes into contact with the ground during rotation of the wheel, causing vibration. Occur. In order to reduce this vibration as much as possible, the grounding distance between the blade lug and the square lug and the grounding distance between the square lugs are all made substantially the same (Actual No. Sho 59-1378).
No. 01).

It is slightly effective in reducing the vibration that the total grounding intervals of the lugs are substantially the same as in the above-mentioned agricultural wheel,
For two-wheel management machines, etc., vibration due to left and right fluctuations occurs in addition to vertical vibration, so it cannot be said to be sufficient yet. That is, as described above, since the lug intervals are large and the blade lugs are inclined with respect to the radial direction (centripetal line) of the wheel,
The center that substantially supports the load will be shifted forward in the rotation direction, which hinders the smooth rotation of the wheels, which causes the vibration to not be alleviated.Furthermore, when the field is soft, The drawback was that the wheels would sink.

Therefore, in order to solve these problems, the agricultural wheel 11 shown in FIGS. 5 to 8 has already been proposed (see Japanese Utility Model Laid-Open No. 5-84501). This wheel 11
Is the three spokes 1 radially attached from the boss 12.
3, an annular core material 14 made of a metal round bar is welded to the tip of 3, and an elastic ring body 15 is formed by baking rubber on the entire outer surface of the core material 14. The elastic ring body 15 has a tubular shape. Lugs 17 are formed on the portion 16 at equal intervals in the circumferential direction.

Each of the lugs 17 is provided with a circumferential lug portion 17a provided at a substantially central portion in the wheel width direction, and the lug portion 1
7a is integrally formed on one side surface in the wheel width direction so as to have a T-shape in plan view by an axial lug portion 17b extending further outward than the width direction end and protruding substantially parallel to the centripetal line. Further, the axial lug portions 17b are alternately arranged in the circumferential direction on the opposite side of the circumferential lug portions 17a. The outer peripheral ground contact surfaces of the lug portions 17a and 17b are substantially the same.

[0007]

Incidentally, FIGS. 5 to 8
In the prior art shown in (1), not only vertical vibration but also lateral fluctuation can be slightly reduced, and traction force and wheel sinking can be reduced. However, since the axial lug 17b is projected in only one side of the circumferential lug 17a and is T-shaped, the reason why the difference in rigidity is different between the front and rear of the circumferential lug 17a and the joint of the axial lug 17b. Therefore, it cannot be said to be sufficient yet, and there are some problems in biting into the soil and straightness.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to improve the ground contact pressure of the circumferential lug portion to improve the biteability into the soil and to the left and right. It is an object of the present invention to provide an agricultural wheel capable of reducing the fluctuation of the road to improve the straightness and also reduce the vibration during traveling on the road.

[0009]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention is an agricultural wheel in which a large number of lugs are provided at equal intervals in the circumferential direction on a solid or hollow elastic ring made of an elastic material such as rubber, wherein the lug is located at the approximate center in the wheel width direction. And the axial lug portions provided on both side surfaces of the circumferential lug portion in the wheel width direction, the circumferential lug portions being integrally formed in a substantially cross shape in plan view. It is characterized in that the outer peripheral grounding surface of the portion projects more radially outward than the axial lug portion.

Further, the present invention is characterized in that the axial lug portion is provided in parallel with a centripetal line of a wheel, and the axial lug portion is provided from both axial side surfaces of the wheel body. It is characterized in that it extends to the outer side and the inner peripheral side in the width direction. Furthermore, the present invention is characterized in that the difference in height between the circumferential lug portion and the axial lug portion is 5 to 15 mm.

[0011]

According to the present invention, when the wheel rolls, the circumferential lug portion first bites into the soil to eliminate the slippage in the left-right direction and suppress the vibration due to the fluctuation, thereby improving the straightness.
Moreover, vertical vibration is also suppressed. In addition, the axial lug portion mainly exerts a traction force to ensure traveling stability. When traveling on the road, only the circumferential lug portion comes into contact with the ground, so that vibration is reduced. Further, the axial lug portion can secure the traction force of the wheel even on a soft ground and prevent the sinking as much as possible.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention, in which an agricultural wheel 1 is for a two-wheel management machine, and three round spokes radially attached from the outer peripheral surface of a boss 2 are made of a metal round bar. Annular core material 4
Is welded, and rubber is baked on the outer surface of the core material 4 to form the elastic ring body 5.

A plurality of lugs 7 are formed in the tubular portion 6 of the elastic ring body 5 at equal intervals in the circumferential direction. The tubular portion 6 is slightly thicker on both sides in the width direction on the outer surface of the core member 4. As shown in FIG. 4, the inner peripheral side of the tubular portion 6 is slightly divided in the radial direction so as to prevent excessive subsidence in the field. 6a is formed and has a shape capable of preventing the accumulation of mud on the inner peripheral side.

Each lug 7 has a wheel width direction (axle direction).
The circumferential lug portion 7a provided substantially at the center of the lug portion 7a, and the lug portion 7a extends radially outward and further outward than the width direction end on both side surfaces in the wheel width direction of the lug portion 7a. Is formed integrally with the axial lug portion 7b protruding substantially parallel to the centripetal line so as to have a cross shape in plan view, and the outer peripheral ground surface of the circumferential lug portion 7a is an axial lug portion. 7b
Is projected radially outward from the outer peripheral surface.

The circumferential lug portion 7a and the axial lug portion 7 are
The height difference H of the outer peripheral grounding surface of b is about 5 to 15 mm, and the circumferential lug portion 7a first bites into the soil to prevent the wheel 1 from slipping sideways, that is, fluctuating in the left-right direction. As a result, good straightness is ensured. Also,
The inner peripheral side end of the axial lug portion 7b extends to the inner peripheral side end of the core material 4 or radially inward from the inner peripheral side end and reaches the tubular portion projection 6a, and the strength of the lug portion 7b is increased. It is secured so that proper and sufficient traction force can be obtained.

Further, the width of each of the lug portions 7a and 7b is gradually tapered in the radial outward direction, and the rigidity is enhanced so that the soil can be removed well and the waist is strong. Since the pair of axial lug portions 7b is joined to the circumferential lug portion 7a and has the shape of a cross, the rigidity can be made uniform over the entire circumferential lug portion 7a and the straight running property is improved. According to the above-mentioned embodiment, since the outer peripheral ground contact surface of the circumferential lug portion 7a provided on the elastic wheel body 5 of the wheel 1 is projected, the ground contact surface of the lug portion 7a rises, and when the wheel 1 rotates, the circumferential lug is formed. The biting of the portion 7a into the soil is very good, the lateral slippage and the fluctuation of the wheel 1 in the left-right direction are significantly reduced, the straightness is good, and the vertical vibration is suppressed.

Further, the axial lug portion 7b exerts sufficient traction force to secure traveling stability, and it is possible to prevent sunk as much as possible even on a soft ground to secure traction force. further,
When traveling on the road, only the circumferential lug portion 7a is in contact with the ground, so that stable traveling is possible with little vibration. The present invention is not limited to the above embodiment, and for example, the core member 4
Can be a flat strip plate, a square bar, or an annular metal pipe, and the elastic ring member 5 is hollow by omitting the core member 4, and is a pneumatic tire filled with air. Further, the width of the tubular portion 6 (in the axial direction) can be narrowed to be used for a single wheel management machine.

[0018]

As described above, the present invention relates to an agricultural wheel in which a large number of lugs are provided at equal intervals in the circumferential direction on a solid or hollow elastic ring body made of an elastic material such as rubber, and the lugs are A circumferential lug portion provided substantially at the center in the wheel width direction and an axial lug portion protruding from both side surfaces of the circumferential lug portion in the wheel width direction are integrally formed in a substantially cross shape in a plan view. It is characterized in that the outer peripheral grounding surface of the circumferential lug portion is projected radially outward than the axial lug portion, so that the necessary traction force of the wheel can be sufficiently secured, In addition, the straightness can be improved very much, the vertical fluctuation as well as the lateral fluctuation can be greatly reduced to improve the running stability, and the vibration on the road can be greatly improved. Also possible to sink wheels on soft ground It is possible to prevent the.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention.

FIG. 2 is a partially enlarged plan view of FIG.

3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line BB of FIG.

FIG. 5 is a partially cutaway front view of a conventional example.

6 is a partially enlarged plan view of FIG.

7 is an enlarged cross-sectional view taken along line CC of FIG.

8 is an enlarged cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

 1 Agricultural Wheel 5 Elastic Ring 7 Lug 7a Circumferential Lug 7b Axial Lug H Lug Projection Height Dimensional Difference

Claims (4)

[Claims] 1. An agricultural wheel in which a large number of lugs are provided at equal intervals in the circumferential direction on a solid or hollow elastic ring body made of an elastic material such as rubber, wherein the lug is located substantially at the center in the wheel width direction. Are formed integrally with each other in a substantially cross shape in a plan view by a circumferential lug portion provided on both sides of the circumferential lug portion in the wheel width direction of the circumferential lug portion. The agricultural wheel has an outer peripheral contact surface protruding radially outward from the axial lug portion. 2. The agricultural wheel according to claim 1, wherein the axial lug portion is provided in parallel with a centripetal line of the wheel. 3. The agricultural wheel according to claim 1, wherein the axial lug portions extend from both axial side surfaces of the wheel body to the wheel width direction outer side and inner circumferential side. 4. The agricultural wheel according to claim 1, wherein a difference in height of protrusion between the circumferential lug portion and the axial lug portion is 5 to 15 mm.